Pass Labs XA-25

A pure Class A stereo power amplifier delivering 25W per channel into 8 ohms, renowned for its transparency, musicality, and minimalist design.

The Pass Labs XA-25 is a solid-state, pure Class A stereo power amplifier designed by Nelson Pass. It delivers 25 watts per channel into 8 ohms (50W into 4 ohms), making it ideal for high-sensitivity loudspeakers and audiophiles seeking the sonic purity of Class A operation. The XA-25 features a minimalist circuit topology with only three gain stages and eliminates degeneration resistors for lower distortion and higher transparency. Its output stage uses a single pair of high-current 800W transistors per channel in a push-pull configuration, resulting in fast response, low noise, and a large Class A envelope. The amplifier is known for its exceptional clarity, organic musicality, and ability to drive a wide range of speakers despite its modest power rating. The XA-25 is housed in a robust chassis, weighs 48.5 lbs, and is celebrated for its reliability and build quality. It is a favorite among audiophiles who appreciate tube-like qualities without the maintenance of valves.