Right speaker has a humming noise in it. Hum increases with increased volume. If you switch speakers (L to R), then the speaker that was L (now R) has the hum; so, the hum source is not in the speaker, but in the console.
No apparent hum if you're listening to the radio, only when listening to CDs.
Bad capacitor? anything I can try without opening the console housing?
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You have to check the RCA cable to the sub woofer. The RCA cabe have two connections inside it, one is for gain and the other is for ground sheild. If the ground sheild is broken then there will be hum from the sub woofer and it will increase if you touch the ground (rear metal pannel is connected to the ground). Replace the cable and check it again.
Switch on your amp, keep its volue down to extreme low, and listen if there is still hum through the left channel or not. If still there is hum, the left side power amplifier section inside the amp;ifier is faulty. If htere is no hum at this state, hum enters thorugh the audio input terminal, and the input wires must be checked for open sheild connection. OK.
My first thoughts are to replace the large electrolytic capacitor(s) their will be at least two I think, as they could be getting leaky. Though they could be fully charged up on switch on (hence no noise) they could lose it as time passes and let the 50/60 Hz mains hum in (which they stop). Another cause could be a semi-conductor that has become heat sensitive. This again could be in the power supply or something that has both channels running in and out of it. This is because the noise is in both channels, so can't be something that deals with only one channel, even if there are two of them!
Replace the caps first, if that doesn't solve your problem, then get some Servisol Freezer spray and spray any suspect part (one at a time) when it acts up! If the noise goes you have the culprit.
does the hum comes in all input? if yes, check proper earth gounding from wall outlet and if ok check filter capacitor in the power supply circuit. If not in all input, check hook up wire for that input causing the humming noise, could be a bad hook-up wire only. Thanks :)
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 fixed the same issue by replacing the original AC power supply with a 13.8 volt DC power supply (Radio Shack) It seems to be more consistent at high SPL and no hum , as the Boston acoustic unit accepts either AC or DC power.
1. Check the cable of speaker which gives out the hum/cracking sound.Interchange the cables with the one that is working okay and find out if the hum still persists on the relevant Speaker. If the hum has gone, then replace cables ( to be on the safe side replace both right and left channel) to the speaker.If the Hum still persists, check the input female plug of the defective speaker and check if it is not lose or the solder has not gone wet. If so resolder both the wires of the connector by removing it with a soldering iron and scrapping the points of solder with a blade. If the problem still persists. Open both the cabinets. Mark the defective driver with a marker pen. Remove the non problemative driver and replace in it's place the Humming driver and check the configuration on both channels. If there is is problem then it has to do with driver and has to be recoiled and reconed ( ofcourse with a little quality lost) which could be done by any Speaker repair shop as per the manufacturers specifications. If the speaker works fine then the problem has to be either of the crossover network or tweeter. So remove the cross-over network from the defective speaker setup after marking it again for identification, and replace it in the good working speaker, where you now connected the humming speaker. If there is a hum, then the problem is the cross-over network, which should be replaced. If the hum is not there, again try similarly with the tweeter and I am sure you will get the Hum, and you may get a new one of similar specification from the market or get it repaired by a speaker shop. Replace the original configurations as was before. Woofer to its original places and similarly cross-over and tweeter ( as was before you opened the cabinets). Now you have identified the problem, solve the problem by repairing or replacing the culprit device.
I am sure you may not have to go to all these. Perhaps it might be a loose connection or cable problem or even earthing problem. If you do not want to go through all these. Show it to a specialist with reputation ot take it to the company's service centres whose address in your area or nearby area you could get from their official site. Please note I have given my guidance on the premise that the amplifier if fine and has no problem.