PS Audio PMG Signature M400 Monoblock Power Amplifier (Sold as a Pair)

PS Audio PMG Signature M400 Monoblock Power Amplifier

We audiophiles spend years searching for one particular amplifier. Not the statement piece — the reference. The one that does everything right, asks nothing in return, and never reminds you it is there. The M400 is that amplifier.

It carries the PMG M800's design DNA intact: Darren Myers' strikingly low-feedback topology, and a state-of-the-art active power supply that delivers current the instant the music asks for it. Thirty watts of pure Class A bias hold it in its most linear region across roughly sixty percent of typical listening. Two hundred watts into 8 ohms, doubling to 400 into 4 — effortless authority on virtually any loudspeaker worth driving.

The same speed lives here, too: bandwidth beyond 500 kHz, slew rate past 200 volts per microsecond, a 10 kHz square wave returned with edges as clean as if drawn with a ruler. Distortion stays flat across the audible band.

The M400 does not reach for reference performance. It defines it. Sold as a pair. Designed by Darren Myers. Engineered to perfection by Bob Stadtherr. Hand-built in Boulder, Colorado.