SoundStageNetwork.com | SoundStage.com - BHK Labs Measurements: Anthem Statement M1 Mono Amplifier

All amplifier measurements are performed independently by BHK Labs. All measurement data and graphical information displayed below are the property of the SoundStage! Network and Schneider Publishing Inc. Reproduction in any format is not permitted.

Note: Measurements were made at 120V AC line voltage and through the balanced input and with the 0dB gain switch position unless otherwise noted. All measurements made with Audio Precision AUX-0025 filter (AP filter) except where noted.

Power output with 120VAC

Output power at 1% THD+N: 1130W @ 8 ohms, 2120W @ 4 ohms
Output power at 10% THD+N: 1430W @ 8 ohms, 2210W @ 4 ohms

Power output with 240VAC

Output power at 1% THD+N: 1130W @ 8 ohms, 2160W @ 4 ohms
Output power at 10% THD+N: 1430W @ 8 ohms, 2850W @ 4 ohms

Additional data

This amplifier does not invert polarity (XLR or RCA input).
AC-line current draw at idle: 0.36A, 0.69PF, 29.8W
Gain: output voltage divided by input voltage, 8-ohm load
- Unbalanced inputs: 28.5X, 29.1dB
- Balanced inputs: 27.7X, 28.4dB
Input sensitivity for 1W output into 8 ohms
- Unbalanced inputs: 91.0mV
- Balanced inputs: 102.0mV
Output impedance @ 50Hz: 0.0079 ohm
Input impedance @ 1kHz
- Unbalanced inputs: 8.9k ohms
- Balanced inputs: 12.0k ohms

Without Audio Precision AUX-0025 filter, wideband: 1.025V, -9.92dBW
With Audio Precision AUX-0025 filter, wideband: 1.93mv, -63.3dBW
With Audio Precision AUX-0025 filter, A weighted: 0.128mV, -83.4dBW

Measurements summary

The Anthem Statement M1 is a high-powered, solid-state, mono power amplifier designed in-house by Anthem.

Chart 1 shows the M1’s frequency response with varying loads. As can be seen, the high-frequency response is little affected by load. Without the Audio Precision filter, the -3dB point rose from about 38 to 48kHz. The output impedance is so low that the response with the NHT dummy speaker load didn’t show up at the chart resolution used.

Chart 2 illustrates how the M1’s total harmonic distortion plus noise (THD+N) vs. power varied for 1kHz and SMPTE IM test signals and amplifier output load for 8- and 4-ohm loads. These data were taken with the normal 120V AC input. Since the M1 can also accept 240V, I also checked its THD+N vs. power output at that voltage. This is plotted in Chart 2A, along with a curve for 2-ohm loading. The 8-ohm power into clipping was unchanged, while the 4-ohm power was increased a bit. The M1’s power output into 2 ohms reached nearly 3kW before the amp’s 10A circuit breaker popped. With that load, there’s no question that it would have popped earlier if fed 120V. Still, 3kW without clipping is prodigious output!

THD+N as a function of frequency at several different power levels is plotted in Chart 3. The rise in distortion with increasing frequency is quite pronounced at all power levels, the amount above 10kHz being reduced by the AP filter.

The M1’s damping factor vs. frequency, shown in Chart 4, is typical of most solid-state analog power amplifiers: high at low frequencies, and, in this case, beginning to decrease above about 200Hz.

A spectrum of the M1’s harmonic distortion and noise when fed a 10W, 1kHz test signal is plotted in Chart 5. The magnitudes of the AC line harmonics are very low here, and the signal harmonics are predominantly second and third, with a number of higher harmonics at lower amplitudes.

Chart 1 - Frequency response of output voltage as a function of output loading

Chart 1

Red line = open circuit
Magenta line = 8-ohm load
Blue line = 4-ohm load

Chart 2 - Distortion as a function of power output and output loading (120VAC)

Chart 2

(Line up at 10W to determine lines)
Top line = 4-ohm SMPTE IM distortion
Second line = 8-ohm SMPTE IM distortion
Third line = 4-ohm THD+N
Bottom line = 8-ohm THD+N