Originally Posted by cc609cc609
I recently moved and also changed speakers/amps and ran into difficulty integrating the subs (a pair of Funk Audio 18, linked via minidsp).
I found with the subs on the mid/hi range quality is degraded (noisier sounding). After some troubleshooting I narrowed it down to the clone amp as even without anything hooked-up, just powering on the clone amp will cause the degradation.
Today I measured the AC line noise using the simple EnTech AC Noise Analyzer and it confirmed the finding. With the clone amp off the EnTech read ~10 units of noise. Once the clone amp is turned on the noise reading is off the chart - it didn't have a reading and showed overloaded!
Next up I installed an EP Digiplug noise filter (a parallel noise suppressor) into the same powerbar and the EnTech reading dropped to ~150, still way higher than when the clone amp is not on. (I always have the EP Digiplug installed prior to this so while it works, it's not enough.)
Now I am not sure if the noise dumped into the AC line by my clone amp is due to its aging components or it is simply like that.
Generally I would start with blaming whatever was changed.
It is possible that it got damaged in the move.
Did you have dedicated circuits before and now you don't?
Did you have a speaker amplifier that was immune to noise, and now you don't?
I know that miniDSP's are notorious for causing noise, some people have tried doing active fronts with them and they just can't stand the noise they inject.
I've also encountered noise from various DAC's.
I use XBS FP10k's on my mains, connected directly to Sabre Ref DACs (Motu 24AO's), and even with 108db/w/m tweeters I have to be within 2ft of it to hear the hiss from the clone circuitry.
My projector fan makes WAY more noise than the tweeters do.
Now in my new HT, which will be fan-noise free, it might become a problem, but only when no signal is playing (like mute / quite passages etc.)
In any case if you want to visualize the noise, you could buy a Kuman USB O-Scope on amazon, they are dirt cheap and rated up to a few hundred volts in 10x mode.
Then you'd be able to figure out exactly what frequencies the noise is at.
Usually in an amplifier the first thing to die are the capacitors, they can leak fluids, and as you know liquids and electricity generally don't mix well.
If your power conditioners can't filter a clone, then they won't be able to filter out an EMP/CME/lightning strike (all 3 are WAY more powerful.)