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What I have is a subwoofer made by ACI; no information on the amplifier used other than it uses a two prong power cord, no ground.   When I hooked it up to the APS 2000 I got a very loud pitched hum.  Taking if off the 2000 and plugging it into a wall outlet on a different circuit, I still got the hum, but not so loud or high pitched.  Any ideas as to what is causing this both directly hooked up to the 2000 and then only hooked up by way of a subwoofer pre-amp output from the Pioneer Elite Receiver.   The sub is used for HT, which in most cases would drown out the hum.   However with the new sound formats being used by blu-ray you can get sound quality for music that rivals CDs.   If this hum comes through on a quiet passage in a BD concert...well, I'm afraid the unit will receive a "not ready for prime time rating" for me.   I am in process of doing a review on the 2000, and so far the only feedback I'm getting is; from ACI why mess with something that works fine without a power reconditioner.   From our friends at APS take the PC equipment offline from your audio equipment.   This had no effect on the hum.   So, my next option would be as the manual states, use the adjustible circuit that removes hum in torroidal transformers of certain designs.   I did a review on the 1050 which received high praise from me as it solved a tube amplifier problem that could have cost me thousands in burnt tubes and who knows what damage to the mono amps.   I now use a Pioneer Elite Receiver; whigh is the only difference between then and now; that and the location of the house; the ACI subwoofer was in my system at the time of the 1050 review.  So why this change? 

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