PS Audio PMG Signature S400 Stereo Power Amplifier

PS Audio PMG Signature S400 Stereo Power Amplifier

Not every great system has room for two amplifiers. Two boxes, two power cords, two sets of cables — for many listeners that is one requisite too many. The S400 exists for them: the entire PMG Signature experience in a single chassis.

What it is not is a compromise of sonics. This is the full Signature topology built in stereo form — two channels of 200 watts each into 8 ohms, doubling cleanly into 4, drawn from the same state-of-the-art active power supply architecture that drives the M400. The same strikingly low overall feedback. The same bandwidth beyond 500 kHz and slew rate past 200 volts per microsecond — the speed that returns a flawless 10 kHz square wave and lets every transient land exactly when the music intended. The same flat, low distortion across the audible band.

Little in the topology was pared back. One box, one power cord, two channels of genuine reference amplification. Designed by Darren Myers. Engineered by Bob Stadtherr. Hand-built in Boulder, Colorado.