Again the topic of weight of amps

@fleschler I weigh 182lbs, lol, and my wooden floor, with substantial joists, supports me. My upright piano weighs 500lbs, and there is no problem with it either.

I don’t think stereo components weighing a few hundred pounds are a problem for most structures.

mitch2,

     Thank you very much for your interesting and informative responses.  Your, and some reviewers, mentioning the whole issue of truncated bass notes on some class D amps was new to me. After rethinking my experiences with multiple class D amps in my system, however, I completely understand this perception and believe the exceptionally high damping factors of class D amps may be the culprit.  In retrospect, I certainly never heard my Magnepan 2.7QR produce the type of bass that they did when powered solely by my very high powered class D mono-blocks with damping factors >1,000.  I remember enjoying the tight bass but have to now agree it sounded a bit tauter than natural bass heard live.
     Good luck with your new amp rebuilds.

Thanks,
  Tim

@larrykell  I said that I couldn't physically handle a 185 lb. amp.  My current listening room floor can handle a 7.5+ earthquake let alone a few hundred pounds of equipment.

My 1993 constructed prior home had a similar custom 6" slab with 2' exterior footings, 1' interior footings, 8" plate with 6" staggered studs every 8"- no damage from the 1994 6.9 Northridge earthquake. 

@fleschler I guess I misunderstood you and thought you said we should be worried that a floor couldn’t hold that kind of weight.

I put my Gryphon on those little felt furniture pads so that I can slide it around. It doesn’t get moved often but I can slide it a few feet, or across the room, by myself.

When I needed to get the amp moved, I paid my building guys to help move the thing. That’s an advantage to living in New York City. Yes, it’s a pain to move such a heavy amp, but I hope to never have to do that again. It’s a lifetime amp for me, one I expect to keep for decades.

I’m glad you live in a solid structure in California. I never could get used to earthquakes and I went through two small ones when living in LA. I guess I’ll take my chances with hurricanes over earthquakes. It’s always something.

I remember enjoying the tight bass but have to now agree it sounded a bit tauter than natural bass heard live.

^^ This. Overdamped speakers have been a common problem in high end audio for some decades now as most solid state amps overdamp the speakers for which they are intended. No speaker made needs more than 20:1; when damping factors are excessively higher the bass is 'tighter' than real life. To me tight bass is a coloration of sorts; when there is tight bass, bass definition suffers and so does the wallop.