Question about Yamaha Audio Players & Recorders
First you need to determine if this hum is coming from the Amp or the sub - if the hum is there when you power on with no volume there is a problem with the Amp itself. Often this can be caused by poor grounding of the amp and it is important to ensure all cables are tight and well secured.
The fact that your amp is not switching properly points to a problem within the amp itself. This may be within the switch or a resistor on the circuit. The only way to check this is to test the circuit for a fault.
Sometimes an isolation transformer such as this http://www.amazon.com/gp/product/B0002KR2RM?tag=blurayforum-20 works to elimate the hum associated with a subwoofer being connected.
However the switching of your amplifier will need proper testing to identify the cause of the fault.
Hope this helps. Please remember to rate my amswer. Many Thanks.
Posted on Jul 24, 2009
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Posted on Jan 02, 2017
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Register and download the manuals for free at retrevo.com
See page E1 regarding placement and safety.
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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