What do a 30 watt stereo solid-state amplifier and a 500 watt solid-state monoblock have in common? A lot, it turns out. The seemingly diminutive Pass Labs XA30.5 weighs 75 pounds, has an enormous toroidal power transformer, and uses 20 output transistors to deliver 30 watts of pure class A power. It turns out these specs are similar, or in some cases, better than my recently reviewed Emotiva XPA-1 monoblocks. The XA30.5 proves that rated power is by no means everything. In fact, if you have speakers of even moderately high sensitivity, the XA30.5 renders any discussion of power output irrelevant. When paired with the right speakers, this may be one of the best amplifiers there is, regardless of price.