March 2005
Anthem Statement
P2 Stereo Amplifier: Measurements
All amplifier measurements are performed
independently by BHK Labs. Please click to learn
more about how we test amplifiers there. All measurement data and graphical
information displayed below are the property of SoundStage! and Schneider
Publishing Inc. Reproduction in any format is not permitted.
 Measurements were made with 120V AC line voltage with both
channels driven, driving the unbalanced inputs unless otherwise noted.
 Gain: 28.3x, 29dB.
 Output noise, 8ohm load, unbalanced input, 1kohm input
termination: wideband 0.270mV, 80.4dBW; A weighted 0.050mV, 95.0dBW.
 Output noise, 8ohm load, balanced input, 600ohm input
termination: wideband 0.205mV, 82.8dBW; A weighted 0.042mV, 96.6dBW.
 AC line current draw at idle: 0.9A.
 Output impedance at 50Hz: 0.0072 ohms.
 This amplifier does not invert polarity.
Power output with 1kHz test signal
 8ohm load at 1% THD: 373W
 4ohm load at 1% THD: 609W
General
The Anthem Statement P2 stereo amplifier is a highpower
solidstate design with typically wide bandwidth and very low output impedance.
Chart 1 shows the frequency response of the amp with
varying loads. As can be seen, the output impedance, as judged by the closeness of spacing
between the curves of open circuit, 8ohm, and 4ohm loading, is quite low. The variation
with the NHT dummy load in the audio range is negligible.
Chart 2 illustrates how total harmonic distortion plus
noise vs. power varies for 1kHz and SMPTE IM test signals and amplifier output load. As
can be seen, attainable power is greater for the 4ohm load as is usual for most power
amplifiers.
Total harmonic distortion plus noise as a function of
frequency at several different power levels is plotted in Chart 3. Amount of rise in
distortion at high frequencies is fairly pronounced and is similar to that of many
amplifiers measured.
Damping factor vs. frequency is shown in Chart 4 and is
unusually high.
A spectrum of the harmonic distortion and noise residue is
plotted in Chart 5. The magnitude of the ACline harmonics is low and typical of many of
the amplifiers measured at BHK Labs. The test signal harmonics are both even and odd
harmonic with the higherorder harmonics smoothly declining with frequency.
Chart 1
 Frequency Response of Output Voltage as a Function of Output Loading 
Red line: open circuit
Magenta line: 8ohm load
Blue line: 4ohm load
Chart 2  Distortion as a Function
of Power Output and Output Loading 
(line up at 20W to determine lines)
Top line: 4ohm SMPTE IM
Second line: 8ohm SMPTE IM
Third line: 4ohm THD+N
Bottom line: 8ohm THD+N
Chart 3  Distortion
as a Function of Power Output and Frequency 
4ohm output loading
Green line: 500W
Blue line: 70W
Magenta line: 20W
Red line: 2W
Chart 4  Damping Factor
as a Function of Frequency 
Damping factor = output impedance divided into 8
Chart 5  Distortion and
Noise Spectrum 
1kHz signal at 10W into a 4ohm load
