Measurement old vintage AMP Pioneer M-90

[x_ivica]

It will be interesting to measurement old power amp Pioneer M-90, just to compare with new modern amp. SN ratio 125 dB.

Output power
(20Hz - 20kHz, both channel) 200W+200W (4ohm)
200W+200W (8ohm)
THD (20Hz - 20kHz) 0.003% (at the time of 8 ohm and an Output power)
Cross modulation distortion (50Hz:7kHz=4:1) 0.002% (20Hz - 20kHz, 200W, 8ohm)
SN ratio 125dB (IHF, a short circuit and A network)

 

[RayDunzl]

If THD = 0.003%

"Signal-to-noise ratio (SNR, or sometimes called SNR-without-harmonics) is calculated from the FFT data the same as SINAD, except that the signal harmonics are excluded from the calculation, leaving only the noise terms. "

SINAD might be in the high 80s, I'll suppose.

 

[RayDunzl]

Oooh...

https://www.analog.com/media/en/training-seminars/tutorials/MT-003.pdf

https://www.analog.com/en/design-center/interactive-design-tools/snr-thd-sinad-calculator.html

200W 8 ohm --- 40Vrms -- 56.56Vpk -- 113.12Vpk-pk

 

[solderdude]

Most likely the Noise figure is given with respect to 200W which would make the S/N ratio 109dBA opposite 5W and 102dBA opposite 1W.
The latter is normal listening level.

Then there is the A weighting which 'improves' the number by not measuring noise below 1kHz as much and the treble.

Nice number, not so relevant wrt. to real world data.