Stereoplay rates 1000 Pro Best of Class

[K4680]

Hello, for comparison the measured value of Devialet 400 (test of 2014)  

Notes on the performance measurement of amplifiers!

Various measuring methods exist in the audio area:
1-Sinusoidal Power
2-Rated power according to DIN 45500
3-RMS
4-PMPO

1.
In the case of sinusoidal power, a signal from 20Hz to 20kHz is measured up to a specified distortion limit. The total harmonic distortion must be below the specified range in the entire frequency range.
2.
The rated power is determined by applying a clean 1kHz sine at the input of an amplifier and until the harmonic distortion reaches 1%.
The measurement time is 10 minutes.
Nominal power makes sense in the design of amplifiers, but not in loudspeakers.
3.
RMS (root mean square) means the square mean value.
The RMS measuring method is used for load tests for loudspeakers. It is measured here with a so-called pink noise with a level drop of 3dB / octave, which comes closest to a music signal.
However, the use of pink noise is not useful in the performance measurement of amplifiers.
4.
PMPO
Maximum performance, music performance and especially PMPO data are completely useless and have no meaning!

To now compare different test, it would be useful to know how the manufacturers measure or according to which standard.