Line conditioner...

I respect all experiences and more all people.... I only wanted to thank you for the description of this problem ....

Any audio problem can be approach in many ways and successfully...

But in my experience the source of noise in my system was coming from vibrations/resonance, from my electrical grid, and the sound was greatly impaired by the bad acoustic of my room...

You are right i know many interesting products to clean the noise in many ways.... I just cannot afford them then i was in the obligation to create my own solution, not perfect but it have worked for me....

Your description was corresponding to the problems i encountered.....

My best to you....

plus one for 68pete. I've had great results with their products.

If you turn on your system, the source is a good CD/SACD, well made, with a good power supply. Turn the volume all the way up, with nothing playing.
My system you hear NOTHING, no noise anywhere, from the tweeters, the mids, the bass drivers, the subs, every source of noise is gone. pure silence!

There is a few thing powered up too, 7 power amps, Preamp, Active OXO, TT (sometimes), Sdac x 2 , Streem, TV, and MC

Some settle for a whole lot less and call it good. NO NOISE, ZERO.

BUT

There is a slight hum at the conditioner closer than 2 feet. It goes away, at 25% volume when under load, and stays gone until 85% volume, then returns from 85-100%. If I stay at 100% for 2 seconds, that goes away also. To me that is a NO NOISE system... I have one conditioner in another room, both plugged into the same 20 amp circuit and the same outlet.

I guess you would call that less noise, but not sound better.. Makes me think something is wrong if it sounds better. Why have filter caps on a power supply if it doesn't FILTER very well.. Kinda short in terms, but long in meaning, AY?

Regards

There is a slight hum at the conditioner closer than 2 feet

If that's from the conditioner itself it is likely to be mechanical, should just be a matter of finding the right screw to tighten.

Have you tried the same test without having the conditioners in the circuit? I'm genuinely interested in understanding what these things do that the manufacturers of our amps don't consider worth doing in their own power supplies.