SA-250 mkIV

About the SA-250 mkIV

The Plinius SA-250 mkIV is a robust stereo power amplifier designed for high-fidelity audio performance. It delivers 250 watts per channel into 8 ohms in stereo mode and up to 900 watts into 8 ohms in bridged mono mode. The amplifier supports both balanced (XLR) and unbalanced (RCA) inputs, selectable via an Amplifier Configuration Selector (ACS), allowing flexible integration with various preamplifiers. It features a frequency response from 1Hz to 70kHz, total harmonic distortion of 0.05%, and a signal-to-noise ratio of 100dB. The amplifier can operate in Class A or Class A/B modes, with Class A providing 100 watts of pure Class A bias. The build is substantial, weighing approximately 57 kg, with large heat sinks and multiple speaker output terminals supporting bi-wiring. The sound character is described as neutral with deep, powerful bass, smooth midrange, and accurate treble without harshness. It is noted for excellent transient response, dynamic control, and a wide, deep soundstage. The unit includes features such as a ground lift switch to eliminate hum loops and adjustable LED brightness. The SA-250 mkIV is highly regarded for combining brute power with finesse and musicality, suitable for driving demanding loudspeakers.