Had a friend visiting who had 2 home-built monoblocks and a preamplifier with him. I have a Densen B-110. After reviews a highly recognized integrated amplifier. 2x60 W in 8 ohms and 2x120 W in 4 ohms and a total of 70,000 µF in the power supply. So, unless you turn it all the way up, it should have plenty of power. The monobloks seems to be 2x100 W, but since the volume knob is a little turned, I think we are far from something that resembles cutting. But why did they both say (I stood behind the speakers myself) that it sounded like my speakers became twice as big. And even where I stood, I immediately noticed that there was a completely different grip on the bass. The volume was also higher so we turned it down so it was probably roughly the same level at before on Densen. But what makes the sound bigger and just like more bass. After all, an amplifier is within less than 1 dB and we are playing with a few watts. I am not into the quality of the sound, only "fullness" and the speakers feel bigger. It's a small 2-way with a 6.5" midwoofer. Fullness is of course also important for the quality, but I haven't listened to perspective details and other things, I just think about the "fullness" of the sound
Resonances and distortion tends to reveal the speaker so with less of that, the speaker disasters and stage gets bigger. Thats my experience.
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The 2 amplifiers likely have different damping factors. Lower damping ( higher output impedance ) will damp the woffer resonance less and thereby accentuate base. This is more pronounced on speakers that need heavy damping from the amplifier.