I've got or had 4 oneac's and a powervar. One of the Oneac's (CP1102) was brand new, no noise. One (CP1102) was used and is quiet. The third (CP1103) was used and hummed enough that I could hear it when it was quiet in the room. Drove me nuts and now it's upstairs on computer duty. The Powervar (ABC600) replaced the 1103 and was dead quiet until I plugged in the 4th item (it has 4 outlets) and I think I overloaded it, at that point it started humming. To be fair, the 4th item was a 6 outlet strip so I ...
Byteme, is that Hubbell IG5362 or plain 5362 you have? I just had some IG5362 sent to be Cryo'd. I'll be comparing them to ACME cryo outlets later.
As far as this noise problem. You guys have to first figure out what type of OneAC you have. They have mainly 3 types: 1) Isolation transformer(with some small caps for RFI filtering and surge protector), 2) ferro-resonant conditioner (has isol transformer also, but also has a HUGE motor-run cap inside looking like a big metal can), 3)UPS(should have some sort of battery backup).
#1 have very slight hum only audible when your ear is within inches of the thing. Only if you overload the unit's rating, it'll start to hum loudly. This stuff is best used with digital gear where it can do wonders.
#2 have the WORST noise problem. They all have higher noise than #1, and most of them have a pretty loud noise audible from listening seat. I've tried about 5 of these things and only one so far is quiet enough. Audio use can be hit or miss, BUT if you stick your digital gear into #1 and plug #1 into #2, plug other gear into #2, things can sound quite good.
#3 should have the least noise as there is no isol tranformer or large caps. The cheap ones sound like crap for audio. However, expensive ones that output "true sine wave," are well worth the money (usually $800-1200 range) especially after a little mod. BTW, this is what I use now...
