I have a Yamaha amp and all the speakers work fine. Added the above speaker. No hum whem only connected to the power supply but as soon as it is connected to the amp a low hum starts. Speaker appears to work fine but the hum is apin. Anu advice would be great.
Hiya, try a different input cable (from amp to sub) if you have make sure that is ok.
Failing that if there is an earth in the plug, try to disconnect that (earth loop) - unlikely but hey electronics.... anything possible :)
If still there with new cable, earth off etc, then the Yamaha could have a problem but find that difficult to swallow...
Let me know if helps, see any other possibilty
Best of luck
Hi vandergoot,
It really does sound like an earth loop issue, especially if its doing the same on another amp.
If you not happy about disconnecting the earth, the try leaving the earth free on the input cable. Test it by putting a pin/clip or something to the centre ring of the input and only touching the tip of the rca plug. That way the earth is off. If it sounds much better, then it is an earth problem, you may not have a choice but to disconnect the main earth from plug
The other possibility is that the earth on the sub is not connected correctly. Try earthing the outside ring of the RCA while its all plugged in to any metal screw etc just with a short piece of wire.
Not ideal ways either way but might get lucky. If it doesnt help, will have to go in. Probably not to serious (broken track/loop) so should be fine but get a quote first!
Best of luck
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What type of amp is it
Register and download the manuals for free at retrevo.com
http://www.retrevo.com/support/Yamaha-YST-SW320-Subwoofers-manual/id/320bh340/t/2/
See page E1 regarding placement and safety.
http://www.retrevo.com/support/Yamaha-DSP-A595-Amps-manual/id/319ag821/t/2/
Page 44 - read about "humming".
If you have hum on the sub, is it there with and/or without the input cable attached?
Disconnect the input(s) and see if it hums in the absence of an audio source. A bad audio cable shield or unwisely-routed audio cables will allow entrance of unwanted signals from external power sources, magnetic fields, even dimmer-controlled track lights. Sometimes, simply reversing the orientation of the ac power plug can eliminate humming.
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Thanks Ganx. I have tried different leads Checked the fuses etc but the hum is still there. I dont want to disconnect the earth lead. It only hums when it is connected to the amp. Have also tried it on a friends amp does the same thing on his. The amp is a Yamaha.
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