My Logitech speakers always humm or buzz when I turn them on and then they frequently pop until they're warmed up (5-15 min). Also, when playing music when they're first turned on, it will sound great but then suddenly the volume amplifies about 10x.
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Re: humming and popping but only at first
Try going through this troubleshooting procedure site first:
If you get no solution from this, there are other similar logitech speaker systems that have had similar problems on initial models. Although none appear to be from the z-2300 it appears that logitech have been very helpful with replacing speakers in the past if design is faulty. Give them a try.
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A buzzing/humm sound could be a earth loop problem. This is caused by connecting amp equipment into different mains power outlets.
Use a power board and connect all your amps and laptop to the one power board.
WHEN THERE IS A BUZZING NOISE IT MEANS THAT ONE OF THE INTERNAL COMPONENT HAS FAILED .RANGING FROM A SMALL DIODE TO LARGE PARTS LIKE THE MAGNETRON OR TRANSFORMER OR CAPACITOR. IF IT IS 10 YRS,OLD YOUR BETTER OFF GETTING A NEW ONE .BECAUSE YOU COULD INVEST MONEY IN THIS ONE AND HAVE SOMETHING ELSE GO TWO DAYS FOR NOW.WITH A NEW ONE YOU ALSO END UP WITH THE NEW WARRANTY. HOPE I HELPED. KEN62 GOOD DAY!
Buzz through speakers usually means it is picking up humm from a power source. Check your mixer and amp input (gain) levels. If one is turned up really high you will get buzz. If that doesn't work check where it is plugged in. Is it sharing power with another electronic piece of equipment? You can also buy a power conditioner (I believe it is called). It will put out "clean" power (power without Hz humm). They can be expensive though. Less exspensive mixers will put out humm. Lower that gain as low as possible and raise the amp gain. Or vice verse
You may have blown the speaker and need to replace it. Try at a low volume and then at high to notice any difference, if the popping occurs only at higher volume then it needs replacing. I hope this helps
switch your subwoofer off from the socket for at least 30 minutes and check if the noise is still there,if its still there open it and play a movie then press it lower if the sound stops then you will have to put some toilet papers at the back of it ,thats what I did to mine.
It sounds like a capacitor in the power supply is just about to die. With the power disconnected have a look at the large tin can looking gizmos near the power transformer. There could be a couple of them. Leave the unit switched off for a while before going near them they could still pack a splat. Replace them with the same value and make sure they're connected the right way and it should solve your problem.
Whilst in there have a good look for any other smaller capacitors which look as if they're getting rounded at the top. Replace them too.
Either that or dig deep and buy a new one.