Dear @mendef :I think that some way or the other almost all posts are good to read about that subject.
As some of you I walk from " here to there " several times: stereo vs monobloks.
I learned almost all what almost of the audiophiles experienced.
For the last 5-7 years I use Levinson Reference 20.6 monobloks ( a 20 years ago Curl design . Yesmy amps are second hand ) mainly because its electronics and protection ( bullet proof. Even a short circuit can't make a damage to the amp. ) are till today unsurpassed.Two years ago I changed all the power supply electrolyt capacitors ( important up-date/grade. ).
As is should be my monobloks are at les than 1m. of the speakers external crossovers and hard wired directly not to a circuiot board ( crossover ) but to the crossover passive parts ( caps and resistors ).
Due that I have all the circuit diagrams I learned that even its very high quality of the 20.6 the best improves is to be certain that both amps measured the same including its bias ( those circuits/bipolar transistors runs in pure class A starting at 100 watts under 8 ohms and doubling that power ( watts ) down to 0.5ohms ( 1,600 watts ) and can run at an impedance as low as 0.1 ohm.
Well, it was worth of rewards been matched my monobloks. Yes you need a toom/system with very high resolution to listen that kind of improvent.
@mendef at the end all depends of your main system MUSIC/Sound targets and money.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.