On Wed, Mar 25, 2020 at 8:51 AM Michael Barnes <barnmich...@gmail.com> wrote:
> > On Wed, Mar 25, 2020 at 8:17 AM Galen Seitz <gal...@seitzassoc.com> wrote: > >> On 3/24/20 10:23 PM, Michael Barnes wrote: >> > Not really Linux related, but very strange. I have a real nice set of >> Altec >> > Lansing computer speakers hooked up to one of my Linux Mint machines. >> This >> > is a three piece set with two desktop speakers and a large subwoofer on >> the >> > floor. >> >> Model number? >> >> > I've had these speakers for at least ten years and they have always >> > worked and sounded good. I hooked them up to this computer about a >> month >> > ago. After a couple weeks, they started making a very loud low frequency >> > beep/buzz every thirty minutes. >> >> Can you tell if the noise is only coming from the subwoofer? >> >> > It is about a one second burst. I turned >> > them off with the on/off switch on the volume control, and the beep >> > persisted. >> >> So with the switch in the off position, the noise continues? I agree, >> that's very odd. That suggests that the switch is only switching the >> audio input, not the power. >> >> > At exactly :29 and :59. I unplugged the audio input from the >> > computer speaker jack and the beep continued. >> >> As suggested earlier, it could be RFI, but given what you've described, >> I'm leaning towards a failing power supply. >> >> > There is no kind of logic >> > circuitry in this thing. Just an audio amplifier and related >> electronics. >> > The only way to stop it is to unplug it. When plugged in it is like >> > clockwork at exactly :29 and :59, regardless of whether it is connected >> to >> > the computer or not. I hooked up another set of speakers to the computer >> > and they do not do this. Sad, because these are a great sounding set of >> > speakers. >> >> If the speakers were working, but now, without any changes, they have >> started generating noise, I think a cap in the power supply may be >> failing, allowing power line noise to come through. It could also be a >> cap in the audio path that is failing, allowing RFI to get into the >> audio. Please post the model number so we can see how they are wired, >> and where the power comes from. >> >> Please confirm that you haven't introduced anything new to your home >> environment (new appliances, etc.) that might be coincident with the >> noise appearing. >> >> galen >> -- >> Galen Seitz >> > > Model is VS-2121. The sound is not random. It happens at exactly :29 and > :59. It is not quiet, either. We can hear it pretty much throughout the > house, so it's not like something that has been there all along and just > wasn't heard over ambient noise. It is more of a sound than noise, a low > frequency rumble, but not like static type noise as you would get from AC > hum or failing components. More like hitting the bottom note or bass pedal > on a keyboard (musical keyboard, not computer keyboard). I'm not sure of > whether it is coming from all speakers or just the sub-woofer, as I have > not been at the computer when it happens. The computer is in my wife's > hobby room. It is not used that much, only for email and occasional web > surfing. Interesting that the on/off switch doesn't really turn it off. As > I plug/unplug it, the subwoofer pops. > > Thanks for everyone's comments. > > Michael > > Well, it is not the computer. I turned the computer and monitor of and sat there at the appointed time. It seems to be a power line issue. The sound is coming from the subwoofer, although I had the speakers turned off. Next chance I get to sit there at that time, I'll turn them on. I guess the next thing is to see if it is only that breaker circuit. I have no idea what I have in the house that would do something on the power precisely at those times. Michael _______________________________________________ PLUG mailing list PLUG@pdxlinux.org http://lists.pdxlinux.org/mailman/listinfo/plug
