Again the topic of weight of amps

For < 60 lbs or so I can recommend the Bryston 4B3 and Valvet A4 Mk II monos  (review forthcoming for both). The Bryston has more than enough power for most people and while the Valvet is only 55w, it sounds equally dynamic with a reasonable load, and it has the magical liquidity of Class A. Depending on your speakers it should be plenty for an apartment. 

On Class D I have heard them sound pretty good but it is just a matter of taste and maybe even physiology. I’m still fairly convinced that different people react differently to the unique characteristics, and for some it just sounds unnatural. For me my most recent exposure was the Bel Canto Black and while it was impressively quiet and clear, the instrumental textures still didn’t feel completely natural to me. (I’m a violinist and my wife is an oboist.) If it sounds fantastic to you that’s great, but I wouldn’t assume it does for everyone in every system and with all music, and these constant debates to the contrary get rather tiresome...

Cheers,
TAWW

First question is why one would need to move power amps other than when they are first installed....can't think of any good reason, but you could always invest in some amp stands with casters.

I tend to prefer Class A and Class B with big power supplies, so I have four amps over 100 lbs. in use (and another backup that is only about 70 lbs.) As I almost never need to move them, the weight is never an issue.

Having said that, the power amp in my main system right now is a tube amp that weighs only about 50 lbs. - maybe that is a way you could go....

wspohn
First question is why one would need to move power amps other than when they are first installed....can’t think of any good reason, but you could always invest in some amp stands with casters.

>>>>Eggs 🍳 ackley! Which is why the very first thing you should do when you install power amps is to isolate the big honking transformers from the chassis by removing the bolts and placing the transformers on cork or some viscoelastic material, thus turning them into constrained layer dampers.

An amp chassis that has proper mass and weight, ime, has better resolve of details, based on minimizing acoustic and mechanical resonance and vibration. A perfect example is the application of Dynamat extreme to the top lid, sides and bottom of the chassis ( internally ), and also an application of silicon sealant to capacitors, and, some other components. Night and day improvement. Saw a video of the Elac Alchemy amplifier, by it's designer, Peter Madnick. I can only imagine the sonic improvement of what another $500. worth of chassis weight and mass would allow that amplifier to develop into. Enjoy ! MrD. 

The weight and size of Class D is indeed appealing.  So I tried a pair pf PS Audio M700's for my new basement system.  I thought they sounded nice.
Then to compare , I lugged my Classe CA-2300 downstairs.  There was no comparison, to me.  I sent the M700's back and got the PSAudio BHK-250.
It is worth its weight, again to me.  thanks, Ken