M2

About the M2

The First Watt M2 is a stereo power amplifier designed by Nelson Pass, featuring a unique design that uses JFET and MOSFET transistors operating in pure Class A mode without negative feedback. It delivers 25 watts per channel into 8 ohms and 40 watts into 4 ohms, making it suitable for efficient loudspeakers with sensitivities of 90 dB/W or greater. The amplifier employs a passive voltage gain stage using an input autoformer that magnetically multiplies the input voltage by a factor of five (15 dB gain), which is rare in solid-state designs. This approach avoids the use of negative feedback, which some audiophiles believe can reduce musicality. The output stage consists of complementary power MOSFET followers biased in Class A, providing a relaxed, organic sound with excellent dynamics beyond its power rating. The M2 has a damping factor of 20, input impedance of 100 kΩ, and a frequency response of 20 Hz to 25 kHz with minimal distortion (0.025% THD at 1 watt, 1 kHz). It weighs approximately 11.6 kg and measures 430 x 143 x 385 mm. The amplifier requires about one hour to reach optimal operating temperature but is reliable and requires no adjustments. It is designed for audiophiles who appreciate a simple, high-quality amplifier that encourages rediscovery of music collections.