Dedicated circuits

Another question sort of related to the dedicated circuit topic:

either here or on AA I once read something to the effect that the class D of most powered  subs would "dirty up" the power for whatever other audio component was on the same circuit.  I apologize if I am misquoting this, this is a rather foggy subject for me.

So my questions are:  is there any truth to that, and if so, I guess that means your sub should be out there on it's own island?

I am currently running my amp on one circuit, my pre and my CD player on another circuit, and due to what I typed above being stuck in a cloudy recess of my brain, I have my sub on it's own circuit. . . .

Not so for audio equipment power transformers. If voltage drops so does current as well as wattage, (VA)...  In the case of a power amplifier lower wattage, lower power...

Thank you.

@peter_s Synergistic Research’s latest “Purple” (it is actually black) duplex receptacle is an isolated ground type. 

All this focus on dedicated lines, wire gauge and breaker size makes me think it would be beneficial to remind everyone about the importance of having a good grounding system. We just moved into a 17 year old house a few months ago and I could not locate the existing outdoor grounding setup to the main panel which concerned me. This week I had an electrician install new ground rods and large gauge copper conductor connecting them to the main panel ($375). It was done per NEC and local code. I was not expecting any effect on the sound quality of my system, but I was shocked at the improvement in lowering the noise floor and the elimination of a slight-but-annoying glare on female vocal peaks that I have been wrestling with. Another unexpected bonus was that my wife commented that night about how much better the picture was on our plasma TV. Definitely great bang-for-the bucks!

I then starting researching grounding systems and found out that the life expectancy for a copper-over-steel-bar grounding system is only 5-10 years! 

 

@mesch Wrote:

Does anyone know of an amplifier that would require greater than a 15 amp curcuit?  By this I mean one that even for a mil sec would draw 15 amps?

Yes, my Crown Studio Reference 1 Amp requires a 120 Volt, 30 amp dedicated circuit. See power cord below image 2:

Mike

Looking at the Crown Studio Reference 1 manual, I’ve never seen an amplifier with a damping factor of over 20,000! Wow!! That's a 30 amp plug alright. Thanks for bringing that to our attention.