Усилители мощности моно — Anthem M1

The Statement M1 is a Class D mono power amplifier from Anthem, the Canadian electronics company. It was engineered at Anthem's research centre in Ottawa and manufactured in the Toronto area, drawing on more than 30 years of the company's amplifier work, and Anthem developed it to show that Class D amplification could match or exceed its own Statement Class A/B designs. Its slim, rack-mountable chassis was aimed partly at custom installation, where several amplifiers must fit in one equipment rack.

Key specs that matter

The M1 delivers 1,000W continuous into 8 ohms, 2,000W into 4 ohms and 2,400W into 3 ohms (20Hz to 20kHz, 0.1% THD+N), and more than 2,000W into 2 ohms depending on mains voltage. Frequency response is 20Hz to 20kHz within +/-0.1dB into 8 or 4 ohms and +/-0.2dB into 2 ohms, and power bandwidth at 1,000W is 5Hz to 45kHz. THD+N at 1kHz is 0.01% at 1W and 10W, 0.03% at 100W and 0.06% at 1,000W, CCIF intermodulation is 0.003%, signal-to-noise ratio is 113dB and the damping factor is 800 to 1,400 depending on frequency. Voltage gain is 29dB, input sensitivity 3.2V for full power, and input impedance 10 kilohms on RCA and 20 kilohms on XLR. Power draw is 33W at idle and below 1W in standby. The chassis measures 490 x 57 x 476mm and weighs 9kg.

Engineering and use context

The M1 is a purely analogue Class D design, with no analogue-to-digital or digital-to-analogue conversion. Its control system varies the width of the output pulse train continuously in direct relation to the input signal. The output stage is bridged, so each speaker terminal swings only 45V RMS relative to the chassis while delivering 90V RMS differentially across the load. Anthem designed the circuit so frequency response stays nearly flat regardless of loudspeaker impedance, a common weakness of earlier Class D designs, where the output filter interacts with the load. A heat-pipe cooling system spreads heat across the chassis, allowing M1s to be stacked directly on top of one another in a rack with their feet removed. Power switching can be manual, signal-sensing or triggered by a 5 to 24V control signal, with a trigger output to pass the command to further amplifiers. A front LED glows steadily in normal operation and flickers to indicate a fault.

Pairing

Its stability into low impedances makes it a match for difficult, low-impedance loudspeakers. Because the output is balanced across both terminals, the negative speaker terminal should not be tied to ground, as some active subwoofers with high-level inputs do. It pairs with Anthem's STR preamplifier or an AV processor.

Alternatives

Anthem's own STR Power Amplifier is a two-channel Class A/B model for owners who prefer a stereo chassis.