True. I realize I am over analyzing this but the devil is in the details.
+1 I would never compromise my tone and performance just because most rooms sound bad, or some gigs depend totally on front of house. When you have something behind you on stage that sounds great to you, and gives you that 'tone in your head', then, at least in my case, I play better, which means the band sounds better, and for the most part, the audience CAN tell that.
I would just say to not listen with your eyes when you try some of this stuff. Every amp sounds different, and it is impossible to say 'all class D amps sound like this' or 'all tube amps sound like that', etc. Makes little sense to me. There is just as much variability across amps in every power amp topology.
If you are lucky, as I am, to find a couple amps you absolutely love, and they happen to be lightweight, bonus. If you fall in love with an SVT, you will have to figure out a way to carry it! Small amps like the Aguilar TH500, the GK MBFusion800, the Glockenklang Blue Sky and Blue Soul, the TecAmp Puma500/900, the Markbass LMIIL, are among the finest sounding amps ever made to my ear (and I've played them all over the past 40+ years of gigging). They sound VERY different from each other in low end voicing, midrange distortion, and the nature of the treble response, along with absolute wattage/max SPL and EQ voicing design.
That being said, just like no other small amp sounds like a GK MBFusion, no other preamp sounds exactly like your Alembic (The Hartke LH amps are the closest.... not lightweights, but actually are lightweight compared to what you are doing.
I would again, assuming you love your Alembic, do some research on a high powered, lightweight PA type amp that has input sensitivity that will work well with the Alembic. You won't lose any size, but will really lighten the load. If you really want to go small, you might start out with the GK MBFusion800. Massive slam, very small and lightweight, a bit brighter than your Alembic and a bit less bloomy down low, but you might dig the change.
Good thread! I enjoy this topic.