PMG S400 Stereo Signature Power Amplifier

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PMG S400 Stereo | The PMG Signature voice in a more accessible stereo chassis. 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.


Sale price$15,490.00
Colour: Silver

Key features

Frequency Response <10Hz – 80kHz

Doubling to 400 watts into 4Ω per channel

Bandwidth >500kHz

Weight 57.2 lbs / 25.9 kg

Available in Silver or Black

PMG S400 Stereo Signature Power Amplifier

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PMG S400 Stereo Signature Power Amplifier

The PMG S400 Stereo brings the full PMG Signature amplifier experience into a single, elegant stereo chassis. Designed by Darren Myers and engineered by Bob Stadtherr, it delivers 200 watts per channel into 8Ω and up to 400 watts per channel into 4Ω, giving demanding loudspeakers plenty of clean, controlled power. More importantly, the S400 is built around the same philosophy as PMG’s flagship monoblock amplifiers: extremely low feedback, ultra-wide bandwidth, exceptional speed, and genuine Class A operation for the most delicate musical passages.

With its 5 watts of Class A bias per channel, >500 kHz bandwidth, >200 V/µs slew rate, and advanced active power supply, the S400 is designed to stay out of the way of the music rather than impose its own character. It is an ideal choice for listeners who want reference-level amplification but prefer the simplicity of one amplifier, one power cord, and two channels instead of a pair of monoblocks.

PMG S400 Stereo Signature Power Amplifier

Full PMG Signature Performance in One Chassis

The S400 gives you the complete PMG Signature design philosophy without requiring two separate monoblock amplifiers. It combines two independent 200-watt channels in a single carefully engineered chassis, making a high-end system significantly cleaner and easier to install.

You get genuine reference-level amplification while saving valuable rack or floor space and eliminating the need for an additional power cord and extra interconnects.

PMG S400 Stereo Signature Power Amplifier

Powerful 200W/Channel Output That Doubles to 400W

With 200 watts per channel into 8Ω and 400 watts per channel into 4Ω, the S400 has the current capability needed to confidently control demanding loudspeakers. This substantial power reserve allows music to remain composed and dynamic when the recording becomes complex or demanding.

Whether you are listening to large-scale orchestral music, powerful rock, electronic music, or cinematic soundtracks, the S400 provides the authority and headroom needed for effortless reproduction.

PMG S400 Stereo Signature Power Amplifier

Genuine 5W Class A Bias, Exceptional Musical Purity

Each channel receives 5 watts of pure Class A bias, keeping the amplifier operating in its most linear mode during lower-level listening. This is especially important for subtle musical information such as vocal textures, instrument decay, ambience, and low-level details.

Instead of sacrificing Class A performance for the convenience of a stereo chassis, the S400 makes a serious commitment to preserving the purity and natural character of the music.

PMG S400 Stereo Signature Power Amplifier

Ultra-Fast Response with >200 V/µs Slew Rate

The S400 features an exceptional slew rate exceeding 200 volts per microsecond, giving the amplifier the speed necessary to reproduce rapid musical transients accurately. Fast attacks from cymbals, percussion, plucked strings, and other instruments can be reproduced with remarkable precision.

Its ability to reproduce a clean 10 kHz square wave demonstrates the amplifier's extraordinary transient response, helping music sound immediate, precise, and free from the smearing associated with slower amplifier designs.

PMG S400 Stereo Signature Power Amplifier

Ultra-Wide Bandwidth & Extremely Low Distortion

With bandwidth extending beyond 500 kHz and typical THD below 0.002% from 20 Hz–20 kHz at 1W/8Ω, the S400 is engineered to operate far beyond the limits of normal human hearing. This enormous bandwidth gives the amplifier plenty of room to reproduce the audible range without strain or phase-related coloration.

Its strikingly low distortion across different loads helps preserve the original character of the recording, allowing the amplifier to disappear into the system instead of drawing attention to itself.

PMG S400 Stereo Signature Power Amplifier

Advanced Active Power Supply & Monoblock-Inspired

One of the biggest challenges of a stereo amplifier is preventing one channel from affecting the other when both demand large amounts of current. The S400 addresses this with a state-of-the-art active power supply and carefully engineered internal channel separation.

The result is excellent channel independence, with crosstalk exceeding 90 dB at 1 kHz, helping maintain a stable, spacious, and precisely focused stereo image even when the music becomes extremely demanding.

PMG S400 Stereo Signature Power Amplifier

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