I've lived in the world of cathode biased amps, but I'm curious about the 2 channel H amps. They're fixed bias, but have ports on the back of the amp for biasing. Having never thought about, or attempted, biasing an amp, what's the hassle factor? Since you don't have to remove the chassis I imagine it's relatively low, but I don't have any idea what the process entails. I do notice it always says "take to a qualified tech" and while I realize that's some legal speak, I also think, "hassle."