Low bias amps or amps with a "special" power supply like the Sunfire's will sound the closest when going from "stone cold" to "fully warmed up". Since the Sunfire's and other similar amps are highly efficient, you would not really notice ANY increase in your electric bill if you were to leave them on all of the time. While the Sunfire might not suit your tastes, i simply selected it because it is a relatively beefy amp and is well known. Sean
>
>