The Emotiva XPA-1 Gen 2 is an update to Emotiva's XPA-1 500 watt monoblock amplifier. Improvements include more power (600 watts RMS into 8 ohms), and 60 watts of Class A bias.
The Emotiva XPA-1 Gen2 is an update to Emotiva's 1,000 watt per channel monoblock amplifier. There are subtle improvements, from a higher quality RCA jack and electrical changes, but the most noticeable is a switch up front. It allows the XPA-1 to run in Class A for the first 60 watts of power.