I noticed a pattern in the specs. There are several different noise figures (sic) for mono/stereo, high/low gain, B200/LA90, but there's a strange consistency between them.
Take any gain figure in dB, divide by 5.5, and you get very close to the noise in uV - and that's the same for both amps.
When the B100 came out, I wondered if that continued the pattern in performance. I've been meaning to make this post for ages and finally got the time.
I charted all the best power amps, but it was difficult to see correlations, partly because Topping were so far ahead of everyone else.
I focussed on Topping amps, and tried to use ASR data, but it wasn't as complete as the Topping specs which I used instead. I used output voltage and AP measured noise to calculate the SNR .
The suffix after the model number is the approximate gain in that particular condition.
There's a good correlation between all amps - LA90, B100 & B200. Reducing the gain by 10dB typically improves SNR by around 5dB, and that's where the B100's 151dB SNR comes from. Unfortunately the gain has to come from somewhere, and it will have to paid by the preamp performance instead.
I think all this makes the B200 look very good. Topping claim 200W for both 8 and 4 ohms, but the latter is probably closer to 300W going by the similarities with the LA90 bridged, and
Amir's test of the LA90 bridged , and it goes off the scale on
Topping's chart.
