PMG M800 Monoblock Signature Power Amplifier

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PS Audio has been designing and building amplifiers for half a century. Every one has been a step toward sonic perfection — each teaching us something the last could not: about power supplies, about feedback, about the quiet ways an amplifier can color the music it carries. The M800 is where that road arrives. Eight hundred watts into 4 ohms, doubling cleanly down from 400 into 8 — decisive, effortless, never strained.


Sale price$45,990.00
Colour: Silver

Key features

Hand built in Boulder, Colorado

800 watts into 4Ω

Bandwidth exceeding 500 kHz

Balanced XLR & RCA inputs

Available in Silver or Black

PMG M800 Monoblock Signature Power Amplifier

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PMG M800 Monoblock Signature Power Amplifier

The PS Audio PMG M800 Monoblock is the flagship power amplifier of PS Audio’s PMG Signature Series, created as the company’s most ambitious amplifier ever. Designed by Darren Myers, engineered by Bob Stadtherr, and hand-built in Boulder, Colorado, the M800 combines massive power with exceptional speed, low distortion, and refined musicality. Rather than simply chasing higher wattage, PS Audio has focused on making the M800 faster, cleaner, quieter, and more transparent so the amplifier can virtually disappear into the music.

With 400 watts into 8Ω and 800 watts into 4Ω, the M800 has the authority to control even demanding loudspeakers while maintaining effortless dynamics. Its 50-watt Class A bias, >200 V/µs slew rate, >500 kHz bandwidth, active power supply, and low-feedback design work together to deliver a highly resolving and natural listening experience. If you want a reference-level amplifier capable of bringing out the finest details while retaining power and composure, the PMG M800 is built to be the centerpiece of an uncompromising high-end system.

PMG M800 Monoblock Signature Power Amplifier

Massive 800-Watt Power with Effortless Control

The M800 delivers 400 watts into 8Ω and doubles to an impressive 800 watts into 4Ω, with up to 1,200 watts available into 2Ω. This enormous current capability gives it the strength to control demanding loudspeakers without sounding strained, compressed, or overwhelmed.

As a true monoblock, each amplifier is dedicated to a single speaker channel, providing exceptional channel separation and allowing the stereo pair to deliver a huge, stable, and highly controlled soundstage.

PMG M800 Monoblock Signature Power Amplifier

PMG M800 50 Watts of Pure Class A Bias

The M800 features an unusually generous 50 watts of Class A bias, allowing the amplifier to remain in its most linear operating region for the vast majority of normal listening. This helps preserve the natural texture and subtle details of recordings without introducing crossover-related discontinuities.

The result is a smooth, transparent, and highly refined presentation where vocals, strings, percussion, and ambient details can sound exceptionally natural and lifelike.

PMG M800 Monoblock Signature Power Amplifier

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

With a slew rate exceeding 200 volts per microsecond, the M800 is engineered to respond extremely quickly to sudden changes in the music signal. This speed helps preserve the leading edge of transients, from the attack of a piano key and snap of a plucked guitar string to the impact of drums and cymbals.

Its impressive >500 kHz bandwidth further demonstrates the amplifier's ability to operate far beyond the audible frequency range, helping it reproduce music with exceptional precision, openness, and timing.

PMG M800 Monoblock Signature Power Amplifier

Active Power Supply & Insta-ntaneous Power Delivery

Instead of relying on a conventional transformer-based passive power supply, the M800 uses a state-of-the-art active power supply designed for speed, stability, and extremely low noise. It can respond rapidly when the music suddenly demands more current, helping the amplifier maintain control during demanding passages.

This gives the M800 a remarkably quiet foundation, strong transient response, and consistent power delivery, allowing bass to remain tight and controlled while complex musical passages stay clean and composed.

PMG M800 Monoblock Signature Power Amplifier

Low-Feedback Design for Natural, Transparent Sound

PS Audio takes a deliberately different approach with the M800 by using strikingly low overall negative feedback rather than relying heavily on corrective circuitry. The amplifier is designed to be inherently linear, reducing the need to constantly correct the output signal.

This philosophy is intended to let the electronics become less noticeable in the listening experience, allowing the character of the source, speakers, and recording to come through with greater immediacy, detail, and natural expression.

PMG M800 Monoblock Signature Power Amplifier

Reference-Level Build Quality & Loudspeaker Compatibility

The M800 is designed to drive virtually any high-end loudspeaker, from sensitive horn systems and electrostatics to demanding low-impedance reference speakers. Its substantial power reserves, high damping factor, and ability to deliver 1,200 watts into 2Ω provide the control required by difficult loads.

Every unit is hand-built and tested in Boulder, Colorado, and includes both balanced XLR and single-ended RCA inputs, silver-plated binding posts, and automatic 120/230V operation.

PMG M800 Monoblock Signature Power Amplifier

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