PMG Signature · Flagship

The new M800
Monoblock.

The flagship of the PMG Signature Series. The best power amplifier PS Audio has ever built — period.

800 watts · 4Ω Power
50WClass A bias >500 kHzBandwidth 99%In Class A
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PMG M800 Monoblock
  • PMG M800 Monoblock
  • PMG M800 Monoblock
  • PMG M800 Monoblock
  • PMG M800 Monoblock
href="/products/pmg-m800?variant=51635812434210" class="link" >PMG M800 Monoblock

The flagship of the PMG Signature Series. The best power amplifier PS Audio has ever built — period.

The M800 is the flagship of the PMG Signature Series, and the best power amplifier PS Audio has ever built — period.
Eight hundred watts of decisive, effortless authority into 8 ohms, doubling into 4. Driven from a state-of-the-art active power supply that delivers performance benefits no traditional transformer-based passive supply can match. A Class A bias of 50 watts keeps your music in the most linear region of the amplifier’s operation for 99% of normal listening, while bandwidth extending well beyond 500 kHz preserves every transient with absolute fidelity.
What truly sets the M800 apart isn’t the power. It’s how that power is delivered. Distortion stays flat across the entire audible band — not minimized at one frequency at the expense of another, but uniformly low from the deepest bass to the highest treble. The M800 accomplishes this with strikingly low overall feedback, an approach that lets the music breathe without correction and lets the speakers and source disappear into the performance.
Designed by Darren Myers. Engineered by Bob Stadtherr. Hand-built in Boulder, Colorado.

Price is per pair
$29,998.00
PMG M800 Monoblock

Design

The M800 is the best power amplifier PS Audio has ever built — period. Darren Myers's design pairs a state-of-the-art active power supply with 50W of pure Class A bias, a bandwidth exceeding 500 kHz, and a strikingly low overall feedback architecture that holds distortion flat across the entire audio band. Hand-built in Boulder, Colorado. Engineered by Bob Stadtherr.

Application

Each monoblock delivers 400 watts into 8 ohms, doubling to 800 watts into 4 ohms, with Class A operation across roughly 99% of typical listening. Sold as a pair for stereo, the M800 drives virtually any loudspeaker with effortless authority — from sensitive ribbons and electrostatics to demanding low-impedance reference systems.

Class A purity

The power amplifier is the last component the music passes through before reaching your loudspeakers, and its role in preserving the recording's essential character is often underestimated. Overtones, transient decays, spatial cues, the subtle phase relationships that tell your ear where each instrument is placed in a room — all of it can be quietly degraded by an amplifier that is otherwise specified well. The M800 was designed against a single conviction: the power stage should add nothing and lose nothing.
The M800 is the flagship of the PMG Signature Series — and the best power amplifier PS Audio has ever built, period. 800 watts into 8 ohms, doubling into 4. A Class A bias of 50 watts that keeps your music in the most linear region of the amplifier's operation for 99% of normal listening. Bandwidth extending beyond 500 kHz. A state-of-the-art active power supply that delivers performance benefits no traditional transformer-based passive supply can match. And distortion that stays uniformly flat across the entire audible band — not minimized at one frequency at the expense of another — achieved with strikingly low overall feedback.
The M800 is not a derivative of any previous PS Audio design. It is a clean-sheet topology by Darren Myers, engineered into production by Bob Stadtherr, and hand built in Boulder, Colorado.

Power is The Key

A power amplifier is, fundamentally, an interface between a reservoir of energy and the loudspeaker. The character of that reservoir — how cleanly it stores energy, how instantly it can deliver it, how silent it is at rest — determines more about how an amplifier sounds than any other single design choice.
For half a century, the high-end audio industry has approached this with passive supplies: large linear transformers feeding banks of electrolytic capacitors. The approach works. It also imposes real limitations. The transformer is the slowest element in the amplifier's signal path. The capacitors store charge but cannot return it without ripple. The rectifier introduces switching noise every time it transitions. And the entire arrangement is sized for a peak demand it will almost never actually see.
The M800 is built on a state-of-the-art active power supply that delivers performance benefits no traditional transformer-based passive supply can match. Instant transient response with no rectifier-induced noise. A vanishingly low residual noise floor. Total grip on the speaker at any output level. Full continuous output without sag. The active supply is the M800's foundation — silent, fast, and capable of delivering everything the output stage asks for the moment it asks for it.

The PMG disappears into the Music

The relationship between an amplifier's output stage and the feedback applied around it is one of the most consequential decisions in amplifier design. Heavy feedback can drive measured distortion to near zero on a steady-state test signal — but it does so by constantly correcting the signal, and that correction has costs the spec sheet won't tell you about. Transient response suffers. The amplifier loses its sense of immediacy. The music starts to feel like a reproduction rather than a performance.
The M800 takes the opposite approach. It is engineered for distortion that is uniformly low across the entire audible band, achieved with strikingly low overall feedback. The output stage is biased for 50 watts of pure Class A operation, which means that for 99% of normal listening, every transistor in the signal path is operating in its most linear region. The music never crosses a notch, never sees a discontinuity, never asks the feedback loop to fix something it shouldn't have to fix in the first place.
The result is the M800's defining quality: it disappears. Speakers and source seem to vanish into the performance. Eight hundred watts of decisive authority, delivered with the openness and immediacy of a smaller amplifier you might love but always wish had more power. The M800 has both

THD vs frequency

Laboratory measurements across representative loads.

8Ω load
4Ω load
No load

Why flat matters

For more than fifty years, almost every solid-state amplifier has shared the same quiet flaw: distortion that rises with frequency, beginning around 4 kHz and often climbing 20dB or more by the top of the audio band. On a highly resolving system, you hear it as hardness on cymbals and a glaze on the top octaves. The usual fix — wrapping the amplifier in heavy global feedback — pushes the number down, but flattens the soundstage and collapses the natural dimensionality of the music. Darren Myers refused that trade-off. The PMG Signature topology holds distortion remarkably flat across the entire audio band, with only the gentlest rise at the very top — and without the heavy feedback that two-dimensionalizes the sound. What the graphs show, your ears confirm.

Features

8 key features

400 watts into 8Ω, doubling to 800 watts into 4Ω

50W Class A bias — 99% of typical listening in pure Class A

Bandwidth exceeding 500 kHz

Flat distortion across the audible band with strikingly low overall feedback

State-of-the-art active power supply

Balanced (XLR) and single-ended (RCA) inputs

Available in Silver or Black

Hand built in Boulder, Colorado

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Specifications

Technical details
Unit Weight 95.7 lbs / 43.4 kg
Unit Dimensions 26.75 in L × 17.5 in W × 8 in H (679.5 × 444.5 × 203.2 mm)
With feet & binding posts: 27.5 in L × 17.5 in W × 8.75 in H
Shipping Weight 119.2 lbs / 54.1 kg (2 units)
Shipping Dimensions 34.4 × 23.1 × 14.9 in / 873.8 × 586.7 × 378.5 mm (2 units)
Input Power Auto Voltage: 120VAC or 230VAC, 50 or 60 Hz
Power Consumption Standby (Ready): <2W  |  Idle: 360W  |  25W/4Ω: 520W
Fuses No user serviceable fuses
Audio Inputs RCA (Single-ended): 1 pair  |  XLR (Balanced): 1 pair
Speaker Outputs Silver Plated Binding Posts: 4 pair
Trigger Input: 3.5mm, 5–15VDC  |  Output: 3.5mm, 12VDC
Gain 26.2 dB
Sensitivity 2.8V
Power Output 400W into 8Ω, 800W into 4Ω, 1200W into 2Ω (1kHz, <1% THD)
Class A Power Output 60W into 8Ω
Frequency Response <10Hz – 80kHz (±0.25dB)
Input Impedance 100kΩ Single-ended  |  200kΩ Balanced
Bandwidth >500kHz
THD <0.002% typical (20Hz–20kHz, 1W/8Ω)
Damping Factor >300 at 8Ω (20Hz–1kHz)

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