Go to Amazon and buy yourself a box of a dozen hockey pucks for about 20 bucks. Place a puck under each foot of your amp and give it two weeks to settle in. I use them under my Pass Labs monoblocs and they work like a charm.
If they don’t work to your satisfaction... you're only out of 20 bucks.
If they don’t work to your satisfaction... you're only out of 20 bucks.