My 3 series II worked well for 2 years. Now when turn on the system there is a loud hum with static the volume of which is not reduced by using the volume control. I have tried using a remote power point but it makes no difference. All of the connections are sound. I am using the speakers from an IMac using the earphone jack as directed.
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Possibly a bad cable or bad ground or bad outlet?. Easy solution, try a different outlet and see if the hum still exists. Also, make sure your speaker cables are NOT run parallel along with, or close to any power cables, Speaker wires can and will pick up AC "Humm" noise.
try swapping the speakers around
if the problem still persists either the speaker is faulty the speakers plug/outlet is
usually at the back of the computer you will have to open up the computer
to check the lead attached to the rear of the input plug make sure the
connection is good be sure to wear an anti
static earth strap before touching anything inside your
computer try cleaning
your computer of dust using a fine air blower from a compressor making VERY
sure that there is no MOISTURE in the air line specifically around the CPU
central processing unit and your sound card dust causes static to build up in a
computer causing it to overheat any many other problems hope this helps
If there is a router or you leave your phone near the speakers that is what is most likely causing the problem. Check to see if anything that gives off a wireless signal (eg. microwaves, cell phones, cordless phones) are nearby, and try to see if moving one of those things fixes your problem.
The hum (50 or 60 Hz) is caused by the AC power getting into the entry point of the amplifier. Either the filtering capacitors from the powersource of the speakers have dried up - replace them - or there is a short in the cables. There is another possibility: if you have kicked the subwoofer box its transformer might have slipped from its fixings and now is touching the subwoofer speaker frame.
The only way to find which is to open the cases.
go to control panel
sound and audio devices
under voice recording clk volume and mute the mic phone...........
some how your mic is conflicting with speakers. Keep your mic away from your speakers..
I had the same problem for many months. I asked a sound & video professional and he suggested I move the subwoofer away from any power source. I had the subwoofer next to my UPS. Once separated and moved all wiring away from the power supply (about 12") the low bass hum was practically gone.
Unplug the minijack from computer to hear if it still hums. If not test speakers at another computer. if it works fine on other computer the sounncard is generating hum noise. Common problem is usually the earthing cable inside the minjack that is touching L or R speakerwire due to bending of cable and breaking off insulation. If youre up to it cut off minijack if its moulde and resolder a new one on.