What happens if I plugged a 20amp unit..15amp outl

It's not just about tripping the breaker. With a big Krell, you need to ensure that input current is not constrained to get the best performance out of it, especially when driving difficult loads at higher volumes (I haved owned a FPB-600C driving Thiel CS5i's for 10 years).

I have the FPB200 (with 20 amp cord from Krell) but this is the smalles Krell power that will work and its not a problem...I did try replacing the FPB400cx and it trips, I believe thats the reason why. It was a loan so I was not prepared to try in for longer sessions but I believe and minimal volume it will play but when you demand the power...its not going to fly.

Rshad0000, out of curiosity which Krell were you using that actually worked on the 15 amp socket? Any of the FPB family by chance?

I have a Theater Amplifier Standard(5x200), which I believe uses a lot of the FPB technology in it -- has a massive transformer.

Trust me I would love to have a 20 amp circuit installed and have no doubt that the dynamics, etc would improve with one. All I am saying is that I have never had the 15amp breaker trip. Actually I am running the Krell and two Parasound JC-1s off the same circuit now and it still has not triped.

I'm getting ready to move and plan on having several 20amp circuits installed in my new home theater room.