• (UFO) Low frequency sinus wave of 5.0 Hz or 7.46 hertz shuts down Denon

    From Skybuck Flying@21:1/5 to All on Tue Jul 26 18:50:37 2022
    Yesterday I was trying to re-create the sound of a UFO, according to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy:
    https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    So I thought it would be easy to re-create that sound with Delphi and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon Receiver 1909 and Creative Gigaworks S750 speaker set !

    But boy was I in for a surprise !

    At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power light would start blinking RED.

    VERY STRANGE. So yesterday I checked all connections, removed some spider web from back right speaker, removed a little fly. Found my glasses super tiny little screw near central speaker which was funny with my flashlight, never thought I would see it
    again. Another backup screw was lost, funny story but oh well. Moved/bend back some copper wire at the back of receiver, it might have been touching a screw (still some air in between) but it was never a problem.

    So I basically ruled-out any connection problem, as was mentioned by the denon receiver manual which I also checked, which explained to check connections. It also mentions something about speakers having a wrong inpedeance or something but I don't
    understand that part.

    Anyway the denon receiver has basically never malfunctioned like this. I can remember hearing some plops on some rare occasions, most on old PC, these might have been some atmospherical/astronomical or loopback issues, but besides from that music always
    plays excellent, gaming is excellent, youtube is excellent, rarely any problems.

    Only weird thing is if I turn on kitchen power that it stops playing for 1 second as well as laptop I guess.

    Anyway today I decided to investigate the problem further and to record it on video because otherwise people are not going to believe. Another reason is because of "Skinwalker Ranch" tv show/youtube/history channel series and they report a strange 2.6
    GigaHertz signal every time UFO sightings occur or something strange/whatever.. probably satelitte related. But anyway this was my main reason to investigate "audio signals" and "frequency ranges".

    So finding this 7.46 Hertz CRASH was quite spectacular and very strange and alarming.

    However the laptop has a defective GPU which has some of it's contacts lost most likely or some kind of defective transistor inside of it so it's unusable for 3D, but the rest seems to work ok. So I kinda doubt it's the GPU at fault. The HDMI also seems
    to work ok.

    Anyway I did some experiments, I also used a web tone generator, that worked fine. I managed to record my own tone generator a little bit with the recording equipment on this laptop by enabling it. It was strangely very soft volume output which I don't
    quite understand, but I enhanced it with goldwave and changed/maximized the volume a couple of time and played it again to see if the wave form would crash the denon receiver it did not !

    At first I thought that maybe the negativity of the samples has something to do with it, maybe, but I am not so sure... I don't think it's that... but it's strange.
    I tried all negative samples at higher frequencies and then denon does not crash.

    Only with below 10 Hertz frequencies does the Denon Receiver "crash"/go into standby mode and only if HDMI is used.

    I also tested the analog inputs to the denon receiver by using my older/main PC which I try not to use anymore because of leaky capacitators, it has a Creative Labs X-Fi Elite Pro soundblaster... and there whatever I did, the denon receiver would not
    crash.

    I also played/changed to different formats for the Denon Receiver on the laptop. Switched from 24 bit, 96000 Hertz to 16 bit, 441000 Hertz, but the crashing remained.

    So by ruling out other cases I think I have isolated the problem to the:

    ASIO4ALL driver version 2.14 and the usage of HDMI.

    So two possibilities now remain:

    1. Either it's the ASIO4ALL driver version 2.14 and it has some kind of bug which causes it to crash the Denon Receiver 1909. Perhaps it's outputting some kind of malformed HDMI packets or something.

    This could lead to the discovery of some kind of HDMI packet attack against receivers ?

    Maybe the Denon Receiver 1909 is detecting the malformed packets and puts itself in standby mode or something to protect itself ?!?

    2. Or the Laptop's slightly defective GPU is causing some kind of malformed HDMI packets ?

    Basically same conclusion as above Denon Receiver detects it and protects itself from a possible attack ??

    Strange clicking/popping can also be heard when the sound starts.

    Other possibilities include:

    3. Perhaps some bug in Delphi ASIO software package, however it did not show up on the old PC/analog connections, so maybe that is not it.

    4. Perhaps bug in my simple software routine, but again I don't think so... because it works fine on old PC.

    Some questions:

    5. It should be valid to generate double floating point values ranging from 1.0 to -1.0 ?

    Or at least 0.99 to -0.99 but even smaller values still crash the denon receiver via asio4all driver at low frequencies.

    So I am pretty sure it's not 3 or 4, 5 was also tested and is most likely not it, 1.0 and -1.0 might overflow to 1.00001 and -1.00001 and such but even lower values still crashed it, so this cannot be it.

    So as far as I am concerned it leaves some possibilities:

    1. Either the ASIO4ALL v2.14 has a serious low frequency bug.

    2. The laptop's damaged GPU/HDMI has something to do with it.

    3. It could also be some hardware bug in AMD HDMI output device.

    (Perhaps some malformed HDMI packet).

    1. Anyway, what you can do to rule out or comform the bug in ASIO4ALL version 2.14 is install it on your system.

    2. Download my tone generator, which I will make available. Run it and then see if it also crashes your Receiver if you have one.

    If it does crash then we could be on to something and then that could mean that Receivers are crasheable somewhat via HDMI packet attacks.

    If it doesn't crash with this ASIO4ALL v2.14 driver then it must be this shitty laptop... and then hopefully this issue will disappear when I buy new computer.

    Anyway I test a lot of stuff and I have seen plenty of weird/whacky problems, this is one of them.

    Oh, I almost forgot, videos to prove this issue is real lol, they are uploading now, fortunately I bought a new fast but hot 256 GB SD card, it's so tiny it's crazy ! Could fit between my teeth ! HAHA. (It goes into a bigger SD card so it fits into my
    camera hehe... some day petabeta SD devices will exist I am sure :) as long as they can cool it hehe)

    VIDEOS TO PROVE AND INVESTIGATE THE ISSUE:

    PART 1: Weird Audio Bug In ASIO4ALL v2.14 with HDMI (?) Part 1 of 4 https://youtu.be/gjnnf_MZmhQ

    PART 2: Weird Audio Bug In ASIO4ALL v2.14 (with HDMI) Part 2 of 4 https://youtu.be/aAC8mnlrGvs

    PART 3: Weird Audio Bug In ASIO4ALL v2.14 (with HDMI) Part 3 of 4 https://youtu.be/rqVfsobfEr8

    PART 4: Weird Audio Bug In ASIO4ALL v2.14 Part 4 of 4 https://youtu.be/pGksplVR8PQ

    It's still uploading as I write this. I am going to catch a drink.

    If everything goes well these videos will be available in a few minutes to sink your teeth into it ! Quite fascinating to see a Receiver crash/shut down like that... never happened before ! HAHA.

    It reminds me of stories of UFO witnesses that say their CARS malfunctioned or all their electronic equipment starting to ACT WEIRD ! ;) =D

    Bye for now,
    Skybuck.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Dave Platt@21:1/5 to skybuckflying@gmail.com on Wed Jul 27 09:40:45 2022
    In article <a42aa45c-704d-40ad-8bcf-6e9c7381ed4en@googlegroups.com>,
    Skybuck Flying <skybuckflying@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy:
    https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    So I thought it would be easy to re-create that sound with Delphi and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon
    Receiver 1909 and Creative Gigaworks S750 speaker set !

    But boy was I in for a surprise !

    At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power light would start blinking RED.

    VERY STRANGE.

    Only with below 10 Hertz frequencies does the Denon Receiver "crash"/go into standby mode and only if HDMI is used.

    This is unsurprising. The receiver is not "crashing" - it is behaving
    as it was designed to behave, It has nothing directly to do with your
    ASIO or other software. It's all about the (low) frequency you are
    trying to play.

    Your receiver is designed to reproduce music and normal theater-
    type sound effects (typically 20 - 20,000 Hz). What you're
    playing isn't "in its scope".

    What you are seeing, is the "ASO / DC protection" feature operating
    normally. You should find this described in the owner's manual
    (the only one I could find on-line is the Japanese version) and the
    feature and the error blinking patterns are described in the
    receiver's service manual.

    This receiver is designed to protect your loudspeakers from being
    accidentally overdriven with DC or sub-sonic power which could damage
    them. Many modern audio speakers are of a "ported" or "vented"
    design, and it's possible to damage these by driving them with
    high-level signals which fall below the resonant frequency of their
    woofer. You can actually drive the woofer so far forwards or
    backwards that the voice coil pops out of the gap (in the front) or
    hits the magnet (in the back). THWAP... permanent damage.

    Speakers can also be damaged by a fault in the amplifier itself...
    e.g. a shorted output transistor. Such short circuits can cause the
    output voltage to "slam against the rails" (maximum positive or
    negative), and this will both pop the woofer out to its maximum
    excursion limit (as above) and turn the small voice coil into a hundreds-of-watts heater. In his book on audio amplifiers, Doug Self
    reports that deliberately DC-faulting an audio amplifier in this
    general power range can destroy a loudspeaker system within a second
    or so - the voice coil and cone literally caught fire!

    So, many audio amplifiers and receivers (and yours is one such) have a
    DC fault protection circuit. They monitor the average voltage level
    at the output, and if it moves far enough away from 0 volts for long
    enough, the protection circuit kicks into action and turns off the
    outputs (and sometimes even the power supply) to protect the
    loudspeakers. Think of it as a sophisticated electronic "fuse" of
    sorts.

    Apparently, a 7 Hz signal (at the level you're trying for) is
    low enough in frequency to be interpreted as either "DC fault"
    or "sub-sonic power capable of damaging loudspeakers" and the
    protection circuit is operating. That's probably a more
    conservative limit than you'd find in a high-end amplifier, but
    it seems reasonable for a home-theatre amplifier and it allows
    the circuit to react rapidly in case of a fault.

    The analog input to the receiver (or the analog output of your sound
    card) probably has a high-pass filter which blocks signals as low as 7
    Hz. HDMI, being digital, doesn't have a simple passive filter like
    this, and so it's capable of passing very-low-frequency signals.

    If you want to generate subsonics like this, and want to risk your
    loudspeakers by playing them, you'll need a different amplifier - one
    which was designed for that purpose (or, at least, one which doesn't
    have a "protect the owner's expensive loudspeaker from expensive
    accidents" safeguard).

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From John Walliker@21:1/5 to Dave Platt on Wed Jul 27 14:27:59 2022
    On Wednesday, 27 July 2022 at 17:40:54 UTC+1, Dave Platt wrote:
    In article <a42aa45c-704d-40ad...@googlegroups.com>,
    Skybuck Flying <skybuc...@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy:
    https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    So I thought it would be easy to re-create that sound with Delphi and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon
    Receiver 1909 and Creative Gigaworks S750 speaker set !

    But boy was I in for a surprise !

    At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power light would start blinking RED.

    VERY STRANGE.
    Only with below 10 Hertz frequencies does the Denon Receiver "crash"/go into standby mode and only if HDMI is used.
    This is unsurprising. The receiver is not "crashing" - it is behaving
    as it was designed to behave, It has nothing directly to do with your
    ASIO or other software. It's all about the (low) frequency you are
    trying to play.

    Your receiver is designed to reproduce music and normal theater-
    type sound effects (typically 20 - 20,000 Hz). What you're
    playing isn't "in its scope".

    What you are seeing, is the "ASO / DC protection" feature operating
    normally. You should find this described in the owner's manual
    (the only one I could find on-line is the Japanese version) and the
    feature and the error blinking patterns are described in the
    receiver's service manual.

    This receiver is designed to protect your loudspeakers from being accidentally overdriven with DC or sub-sonic power which could damage
    them. Many modern audio speakers are of a "ported" or "vented"
    design, and it's possible to damage these by driving them with
    high-level signals which fall below the resonant frequency of their
    woofer. You can actually drive the woofer so far forwards or
    backwards that the voice coil pops out of the gap (in the front) or
    hits the magnet (in the back). THWAP... permanent damage.

    Speakers can also be damaged by a fault in the amplifier itself...
    e.g. a shorted output transistor. Such short circuits can cause the
    output voltage to "slam against the rails" (maximum positive or
    negative), and this will both pop the woofer out to its maximum
    excursion limit (as above) and turn the small voice coil into a hundreds-of-watts heater. In his book on audio amplifiers, Doug Self
    reports that deliberately DC-faulting an audio amplifier in this
    general power range can destroy a loudspeaker system within a second
    or so - the voice coil and cone literally caught fire!

    So, many audio amplifiers and receivers (and yours is one such) have a
    DC fault protection circuit. They monitor the average voltage level
    at the output, and if it moves far enough away from 0 volts for long
    enough, the protection circuit kicks into action and turns off the
    outputs (and sometimes even the power supply) to protect the
    loudspeakers. Think of it as a sophisticated electronic "fuse" of
    sorts.

    Apparently, a 7 Hz signal (at the level you're trying for) is
    low enough in frequency to be interpreted as either "DC fault"
    or "sub-sonic power capable of damaging loudspeakers" and the
    protection circuit is operating. That's probably a more
    conservative limit than you'd find in a high-end amplifier, but
    it seems reasonable for a home-theatre amplifier and it allows
    the circuit to react rapidly in case of a fault.

    The analog input to the receiver (or the analog output of your sound
    card) probably has a high-pass filter which blocks signals as low as 7
    Hz. HDMI, being digital, doesn't have a simple passive filter like
    this, and so it's capable of passing very-low-frequency signals.

    If you want to generate subsonics like this, and want to risk your loudspeakers by playing them, you'll need a different amplifier - one
    which was designed for that purpose (or, at least, one which doesn't
    have a "protect the owner's expensive loudspeaker from expensive
    accidents" safeguard).

    Yes to all the above. I have seen the voice coil pour out of the front of
    a large loudspeaker when it was driven with a high-level low-frequency
    sine wave.
    We were doing free-field audiometry on a profoundly deaf person.
    Everyone else in the test room was using hearing protection.

    John

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Skybuck Flying@21:1/5 to Dave Platt on Wed Jul 27 19:56:47 2022
    On Wednesday, July 27, 2022 at 6:40:54 PM UTC+2, Dave Platt wrote:
    In article <a42aa45c-704d-40ad...@googlegroups.com>,
    Skybuck Flying <skybuc...@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy:
    https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    So I thought it would be easy to re-create that sound with Delphi and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon
    Receiver 1909 and Creative Gigaworks S750 speaker set !

    But boy was I in for a surprise !

    At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's power light would start blinking RED.

    VERY STRANGE.
    Only with below 10 Hertz frequencies does the Denon Receiver "crash"/go into standby mode and only if HDMI is used.
    This is unsurprising. The receiver is not "crashing" - it is behaving
    as it was designed to behave, It has nothing directly to do with your
    ASIO or other software. It's all about the (low) frequency you are
    trying to play.

    Your receiver is designed to reproduce music and normal theater-
    type sound effects (typically 20 - 20,000 Hz). What you're
    playing isn't "in its scope".

    What you are seeing, is the "ASO / DC protection" feature operating
    normally. You should find this described in the owner's manual
    (the only one I could find on-line is the Japanese version) and the
    feature and the error blinking patterns are described in the
    receiver's service manual.

    This receiver is designed to protect your loudspeakers from being accidentally overdriven with DC or sub-sonic power which could damage
    them. Many modern audio speakers are of a "ported" or "vented"
    design, and it's possible to damage these by driving them with
    high-level signals which fall below the resonant frequency of their
    woofer. You can actually drive the woofer so far forwards or
    backwards that the voice coil pops out of the gap (in the front) or
    hits the magnet (in the back). THWAP... permanent damage.

    Speakers can also be damaged by a fault in the amplifier itself...
    e.g. a shorted output transistor. Such short circuits can cause the
    output voltage to "slam against the rails" (maximum positive or
    negative), and this will both pop the woofer out to its maximum
    excursion limit (as above) and turn the small voice coil into a hundreds-of-watts heater. In his book on audio amplifiers, Doug Self
    reports that deliberately DC-faulting an audio amplifier in this
    general power range can destroy a loudspeaker system within a second
    or so - the voice coil and cone literally caught fire!

    So, many audio amplifiers and receivers (and yours is one such) have a
    DC fault protection circuit. They monitor the average voltage level
    at the output, and if it moves far enough away from 0 volts for long
    enough, the protection circuit kicks into action and turns off the
    outputs (and sometimes even the power supply) to protect the
    loudspeakers. Think of it as a sophisticated electronic "fuse" of
    sorts.

    Apparently, a 7 Hz signal (at the level you're trying for) is
    low enough in frequency to be interpreted as either "DC fault"
    or "sub-sonic power capable of damaging loudspeakers" and the
    protection circuit is operating. That's probably a more
    conservative limit than you'd find in a high-end amplifier, but
    it seems reasonable for a home-theatre amplifier and it allows
    the circuit to react rapidly in case of a fault.

    The analog input to the receiver (or the analog output of your sound
    card) probably has a high-pass filter which blocks signals as low as 7
    Hz. HDMI, being digital, doesn't have a simple passive filter like
    this, and so it's capable of passing very-low-frequency signals.

    If you want to generate subsonics like this, and want to risk your loudspeakers by playing them, you'll need a different amplifier - one
    which was designed for that purpose (or, at least, one which doesn't
    have a "protect the owner's expensive loudspeaker from expensive
    accidents" safeguard).

    It sounds believe but there is a problem with this:

    How do you explain the receiver has never shut off before like this ?

    Surely other sounds or pieces of music or games may have generated this low frequency waves... ???

    Perhaps not though, but that would be a bit freaky...

    Maybe this only happens with this perfect low frequency sinus wave.

    What I could do is test your theory to see if the wave is NOT hearable on the creative-xi-elite pro soundblaster, to check your theory that it filters out 5 or 7 Hertz sinus waves.

    (Also part 2 of my video, from 0:10 to 3:40 shows the problem best and shows frequencies from 60, 50, 40, 30, 20, 10 and finally the problem frequency 5, and later 6 as well).

    Bye for now,
    Skybuck.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Skybuck Flying@21:1/5 to All on Wed Jul 27 20:54:07 2022
    OK,

    I just tested it on analog connections and the same thing happens eventually, the receiver goes into "protection" mode.

    Old stinky DreamPC from 2006 situation:

    The reason why it did not happen the other day was because the volume was not at 100%.

    (The Creative X-Fi Elite Pro soundblaster has control over volume as well as the web browser/tone generator)

    Both must be at 100% to mimic the situation which occurs on the other system:

    The toshiba L670 laptop which uses HDMI and ASIO4ALL driver.

    With the laptop situation the volume is always at 100% because the ASIO4ALL driver does not seem to have any control over volume.

    So I think I now understand what happens:

    The sinus wave is very slow at 1 to 5 Hertz or so... so it's not or barely hearable... at least on speakers, on a subwoofer it might be different, but I have no subwoofer currently.

    Because the membrane of the speakers move so slowly it cannot be heard.... but because the volume is set to 100% to membranes of the speakers are pushed to their outer limitations... and this could cause maybe damage on some speakers, like described by
    the other two persons, they might fall out, or touch something.

    Perhaps with my speakers this is not an issue because as far as I know/can tell there is no damage, or at least I think so lol.

    Since the sinus wave is moving rather slowly... 5 times per second or 7 times per second, the risk of damage is maybe low.... or maybe not... depends on how hard the membrane vibrations, 5x or 7x per second can still be quite fast....

    So setting the volume to 100% has no effect on hearability of the wave, because it's moving so slow... it's not hearably... even at 100%.

    Perhaps not enough air is being moved around at this frequency... at least from these little speakers.

    I could do further testing and remove the foam on the front of the speakers to verify that they are indeed vibrating, but I am not going to do that, because I have seen enough.

    I find Dave Platt's explanation believable, except he was wrong with one thing. The protection is available for HDMI but also ANALOG signal.

    I will upload the finally video now...

    Denon Receiver Shutdown Mystery Solved Part 1 of 2: https://youtu.be/cnruFMnrrrw

    Denon Receiver Shutdown Mystery Solved Part 2 of 2: https://youtu.be/A9xSgRI8cvA

    So there was some thruth to my conspiracy theory... haha... there is some circuitry in there that can shutdown the receiver if it receives a "strange signal" / "strange audio wave" :)

    Bye,
    Skybuck.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Martin Brown@21:1/5 to Skybuck Flying on Thu Jul 28 08:31:59 2022
    On 28/07/2022 03:56, Skybuck Flying wrote:
    On Wednesday, July 27, 2022 at 6:40:54 PM UTC+2, Dave Platt wrote:
    In article <a42aa45c-704d-40ad...@googlegroups.com>, Skybuck Flying
    <skybuc...@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according
    to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy: https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    So I thought it would be easy to re-create that sound with Delphi
    and ASIO4ALL v2.14 sound driver and my Laptop L670 and Denon
    Receiver 1909 and Creative Gigaworks S750 speaker set !

    But boy was I in for a surprise !

    At 7.46 Hertz the Denon Receiver 1909 would shut down ! and it's
    power light would start blinking RED.

    VERY STRANGE. Only with below 10 Hertz frequencies does the Denon
    Receiver "crash"/go into standby mode and only if HDMI is used.
    This is unsurprising. The receiver is not "crashing" - it is
    behaving as it was designed to behave, It has nothing directly to
    do with your ASIO or other software. It's all about the (low)
    frequency you are trying to play.

    Your receiver is designed to reproduce music and normal theater-
    type sound effects (typically 20 - 20,000 Hz). What you're playing
    isn't "in its scope".

    What you are seeing, is the "ASO / DC protection" feature
    operating normally. You should find this described in the owner's
    manual (the only one I could find on-line is the Japanese version)
    and the feature and the error blinking patterns are described in
    the receiver's service manual.

    This receiver is designed to protect your loudspeakers from being
    accidentally overdriven with DC or sub-sonic power which could
    damage them. Many modern audio speakers are of a "ported" or
    "vented" design, and it's possible to damage these by driving them
    with high-level signals which fall below the resonant frequency of
    their woofer. You can actually drive the woofer so far forwards or
    backwards that the voice coil pops out of the gap (in the front)
    or hits the magnet (in the back). THWAP... permanent damage.

    Speakers can also be damaged by a fault in the amplifier itself...
    e.g. a shorted output transistor. Such short circuits can cause
    the output voltage to "slam against the rails" (maximum positive
    or negative), and this will both pop the woofer out to its maximum
    excursion limit (as above) and turn the small voice coil into a
    hundreds-of-watts heater. In his book on audio amplifiers, Doug
    Self reports that deliberately DC-faulting an audio amplifier in
    this general power range can destroy a loudspeaker system within a
    second or so - the voice coil and cone literally caught fire!

    So, many audio amplifiers and receivers (and yours is one such)
    have a DC fault protection circuit. They monitor the average
    voltage level at the output, and if it moves far enough away from 0
    volts for long enough, the protection circuit kicks into action and
    turns off the outputs (and sometimes even the power supply) to
    protect the loudspeakers. Think of it as a sophisticated electronic
    "fuse" of sorts.

    Apparently, a 7 Hz signal (at the level you're trying for) is low
    enough in frequency to be interpreted as either "DC fault" or
    "sub-sonic power capable of damaging loudspeakers" and the
    protection circuit is operating. That's probably a more
    conservative limit than you'd find in a high-end amplifier, but it
    seems reasonable for a home-theatre amplifier and it allows the
    circuit to react rapidly in case of a fault.

    The analog input to the receiver (or the analog output of your
    sound card) probably has a high-pass filter which blocks signals as
    low as 7 Hz. HDMI, being digital, doesn't have a simple passive
    filter like this, and so it's capable of passing very-low-frequency
    signals.

    If you want to generate subsonics like this, and want to risk your
    loudspeakers by playing them, you'll need a different amplifier -
    one which was designed for that purpose (or, at least, one which
    doesn't have a "protect the owner's expensive loudspeaker from
    expensive accidents" safeguard).

    It sounds believe but there is a problem with this:

    How do you explain the receiver has never shut off before like this
    ?

    Playing a pure sine wave through a loudspeaker especially at low
    frequencies is a really effective way to damage it. You should give
    thanks that your amplifier is smarter than you are.

    Surely other sounds or pieces of music or games may have generated
    this low frequency waves... ???

    There isn't much in recorded material below about 10Hz.
    Lowest organ pipes you hear are above that and truly huge things.

    Dolby Atmos content includes ultra low frequencies - a fried has a setup
    and we had to spend a few hours rattle proofing the cinema room before
    it could be heard/felt to full advantage. Space shuttle launch...

    https://www.svsound.com/blogs/glossary/infrasonic

    Tim Peake's life as an astronaut stage show includes such a sound system
    at fairly high volumes of infrasound to mimic take off and reentry.

    Perhaps not though, but that would be a bit freaky...

    Maybe this only happens with this perfect low frequency sinus wave.

    If you are lucky it will happen with any sustained high powered sine
    wave to prevent damaging the loudspeakers. Hit a mechanical resonance
    and all bets are off for the speakers continued function. They really
    don't like having their voice coil smashed into the magnet.

    What I could do is test your theory to see if the wave is NOT
    hearable on the creative-xi-elite pro soundblaster, to check your
    theory that it filters out 5 or 7 Hertz sinus waves.

    It won't be hearable as such, but it will probably be feelable if it is
    loud enough.

    Your nearest cathedral with a full size organ is the best place to go to experience infra sound at high power. Durham cathedral's organ goes down
    to 8Hz C-1. Just go when there is an organist practising something loud!

    https://en.wikipedia.org/wiki/Range_(music)#Range_limits

    (Also part 2 of my video, from 0:10 to 3:40 shows the problem best
    and shows frequencies from 60, 50, 40, 30, 20, 10 and finally the
    problem frequency 5, and later 6 as well).

    Bye for now, Skybuck.

    You truly are a moron. It must be a very tough life for your kit.

    --
    Regards,
    Martin Brown

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  • From Phil Allison@21:1/5 to Martin Brown on Thu Jul 28 00:45:06 2022
    Martin Brown wrote:
    ==================

    Maybe this only happens with this perfect low frequency sinus wave.


    If you are lucky it will happen with any sustained high powered sine
    wave to prevent damaging the loudspeakers. Hit a mechanical resonance
    and all bets are off for the speakers continued function. They really
    don't like having their voice coil smashed into the magnet.


    ** FYI the VAST majority of woofers will not do that.

    Voice coil windings move out of the gap area and drive force is lost before impacts can occur.
    Suspensions limits also play their part in this.
    However, some old and tired woofers ( with soft suspensions) plus extreme sub woofer designs with very long voice coils are vulnerable.

    I have seen rare examples of cone damage from over excursion, NOT caused by amplifier over drive.
    One case was from pyrotechnics let off on stage and the other from slamming the back door of a van with ported FB bins inside - destroyed a pair of 15 inch EVs.


    ..... Phil

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  • From Mike Monett@21:1/5 to All on Thu Jul 28 13:20:16 2022
    On 28/07/2022 03:56, Skybuck Flying wrote:
    On Wednesday, July 27, 2022 at 6:40:54 PM UTC+2, Dave Platt wrote:
    In article <a42aa45c-704d-40ad...@googlegroups.com>, Skybuck Flying
    <skybuc...@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according
    to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy: https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).

    Robert Lazar is a lunatic. 7.46 Hz is the frequency of his anti-gravity generator:

    https://www.otherhand.org/home-page/area-51-and-other-strange- places/bluefire-main/bluefire/the-bob-lazar-corner/the-word-of-bob/

    Element 115 was synthesized in 2003. It is called Moscovium.

    It is intensely radioactive, with a half-life of less than 0.65 second.
    There is no possibility of making a sphere to sit on the top of an anti- gravity generator:

    https://en.wikipedia.org/wiki/Moscovium

    Chasing this frequency will damage more than your speakers.

    Please stop responding to trolls. They waste everyone's time.



    --
    MRM

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  • From none) (albert@21:1/5 to '''newspam'''@nonad.co.uk on Wed Aug 17 18:51:15 2022
    In article <tbte1h$lhs$1@gioia.aioe.org>,
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:
    Your nearest cathedral with a full size organ is the best place to go to >experience infra sound at high power. Durham cathedral's organ goes down
    to 8Hz C-1. Just go when there is an organist practising something loud!

    This is probably a 64' trumpet register.
    A 32' diapason/praestant/bourdon register would be a better experience as the energy is concentrated in the low harmonics.

    --
    Regards,
    Martin Brown

    Groetjes Albert
    --
    "in our communism country Viet Nam, people are forced to be
    alive and in the western country like US, people are free to
    die from Covid 19 lol" duc ha
    albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst

    --- SoupGate-Win32 v1.05
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  • From a a@21:1/5 to Mike Monett on Wed Aug 17 10:56:35 2022
    On Thursday, 28 July 2022 at 15:20:27 UTC+2, Mike Monett wrote:
    On 28/07/2022 03:56, Skybuck Flying wrote:
    On Wednesday, July 27, 2022 at 6:40:54 PM UTC+2, Dave Platt wrote:
    In article <a42aa45c-704d-40ad...@googlegroups.com>, Skybuck Flying
    <skybuc...@gmail.com> wrote:
    Yesterday I was trying to re-create the sound of a UFO, according
    to the website of Bob Lazar:

    Website of EX-UFO Reverse Engineer guy: https://boblazar.com/

    The website mentions a frequency of 7.46 Hz (Hertz).
    Robert Lazar is a lunatic. 7.46 Hz is the frequency of his anti-gravity generator:

    https://www.otherhand.org/home-page/area-51-and-other-strange- places/bluefire-main/bluefire/the-bob-lazar-corner/the-word-of-bob/

    Element 115 was synthesized in 2003. It is called Moscovium.

    It is intensely radioactive, with a half-life of less than 0.65 second.
    There is no possibility of making a sphere to sit on the top of an anti- gravity generator:

    https://en.wikipedia.org/wiki/Moscovium

    Chasing this frequency will damage more than your speakers.

    Heavy speaker boxes placed on the floor or mounted to the wall, can generate infrasounds, infrasonic vibrations transmitted the the building structure, playing 5Hz sounds

    read
    \about butt kicker

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  • From a a@21:1/5 to none albert on Wed Aug 17 10:54:20 2022
    On Wednesday, 17 August 2022 at 18:51:22 UTC+2, none albert wrote:
    In article <tbte1h$lhs$1...@gioia.aioe.org>,
    Martin Brown <'''newspam'''@nonad.co.uk> wrote:
    Your nearest cathedral with a full size organ is the best place to go to >experience infra sound at high power. Durham cathedral's organ goes down >to 8Hz C-1. Just go when there is an organist practising something loud! This is probably a 64' trumpet register.
    A 32' diapason/praestant/bourdon register would be a better experience as the
    energy is concentrated in the low harmonics.

    --
    Regards,
    Martin Brown

    Groetjes Albert
    --
    "in our communism country Viet Nam, people are forced to be
    alive and in the western country like US, people are free to
    die from Covid 19 lol" duc ha
    albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst
    very low frequency sensors, called seismographs are used to record infrasounds or infrasonic vibratrions

    my CTBTO conference paper dealt with live trajectory reconstruction of a flying object
    to predict impact geolocation, using a number of mobile GPS, accelerometer, gyroscope enabled tablets/ smartphones


    https://www.ctbto.org/fileadmin/user_upload/SandT_2011/posters/T5-P16%20I_Sokolova%20Database%20of%20digitized%20historical%20seismograms%20for%20nuclear%20tests%20monitoring%20tasks.pdf#:~:text=Digitized%20seismograms%20can%20be%20successfully%20used%
    20for%20developing,geodynamics%20and%20underground%20nuclear%20tests%20influence%20on%20medium.

    Seismographs are used to detect remote and globe-wide nuclear weapons test sites as local earthquakes

    https://www.bgs.ac.uk/discovering-geology/earth-hazards/earthquakes/how-are-earthquakes-detected/
    \ https://www.ctbto.org/fileadmin/user_upload/SandT_2011/posters/T5-P16%20I_Sokolova%20Database%20of%20digitized%20historical%20seismograms%20for%20nuclear%20tests%20monitoring%20tasks.pdf#:~:text=Digitized%20seismograms%20can%20be%20successfully%20used%
    20for%20developing,geodynamics%20and%20underground%20nuclear%20tests%20influence%20on%20medium.

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