Rerurn to Romy the Cat's Site

Beav wrote:

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?

 The “hum” might be from various reasons. If you imply the 60Hz and 120Hz then it most likely some odd ground loops that in case of PP2000 are more complicated. It need to be know if the hum you described is not mechanical nature, what kind it is, how it relates to volume…. the regular things. What surprised me that if people have ground loops with records cartridges then they fight the loops but what they have the same proboems with AC lines then they feel that it is much different…

Actually, Beav, there is something different in your case. I think what you do it wrong. If you are a reviewer and you are in possess of writing a review about the PP2000 then I would advise you do not search online what others say but subject of your review but you your own mind. If you have any technical or exploiting difficulties then take it to the PurePower people as the observation of their compliance to your problems shall be a part of your review as well. I know that many of the audio “reviewers” write their semi-idiotic observation by browsing web and snatching the phrases and opinions from here and there.  I do not think that you would do a good service to your or other is you practice it.

So, if you are in possesses of writing a review then you shell not read this thread and shell not ask questions. Your job is to provide answers or to sharpening the questions…

Rerurn to Romy the Cat's Site