I think performance is absolutely identical for LA90 / B100 / B200. Not only little (academic) differences (because fully transparent), but no measurable differences at all.
First I assumed that the B200 is cleaner than the LA90 (about 3 dB), but then I saw: the topping guys are using a-weighted measurements, so it is 3dB or so better than
@amirm ˋs measurements.
It’s only the power (8 Ohm) that differs:
LA90: 40 Watts
B100: 50 Watts
B200: 140 Watts
LA90 bridged: 270 Watts
What scares me most, is the LA 90 poll: exactly half of the users have had problems with their devices!
That is not much better than the PA 5.
If all three „Top of the Pops“ Topping amps are practically engineered in the same fashion,
I am afraid the issues will appear in the same fashion.
There is something very very nice with the Benchmark AHB-2: it sounds AND works. Day by day by day in many recording studios. VW Beetle-like.