Moving speakers from downstairs to upstairs, degrading ?

As long as the carpet is the same that's all that matters. 

You want 2 things:

1 - Minimal surface contact to the floor.

2 - Minimal ability of the speaker itself to move back and forth due to energy from the drivers.

For #1 above, you don’t have to go crazy. Puck-like feet are fine if they are on a solid surface. The idea is to keep any resonant surfaces of the speaker cabinet from directly making contact.

For #2, sometimes added mass to the speaker can help, but you want to avoid a puck on thick carpet, as that will encourage rocking. Spikes which directly couple to the underlying floor board are preferred.


Also, no 2 rooms are alike, so you should always get professional help like GIK Acoustics. :)

Best,

Erik

carpet on concrete is the worst...do what Erik says and your speakers should sound better...I use Mapleshade stuff on all my equipment

nasaman

Make sure upstairs the speakers are de-coupled from the floor (no spikes), or it will become a soundboard for the bass, and ruin it.
If you can use a heavy plinth (eg: cement path slabs) under each speaker and then use 4 of these Sorbothane pad between the speaker and the plinth, 4 are good for 800lbs

https://www.ebay.com/itm/4-LARGE-SORBOTHANE-DISC-CIRCLE-FEET-PAD-2-5x0-5in-64x12mm-SILENT-PC-AMP-FIRM-70D/372429364953?epid=1031478471&hash=item56b6851ed9:g:O04AAOxycmBS70F6

Cheers George

its way more than the slab vs suspended floor. Its the structure (walls, ceiling, etc.) and how live that is. You shall see. As I can since i just built anew music room on the upper floor, and empty its a freaking echo chamber. I have much treatment to do!