I use sand boxes under tubed equipment.I've tried various rollers,cones,etc. with and without the sand and prefer just the sand.My amp rests on an isoacoustic speaker stand.The sand plus a heavy amp would be a bit heavy for the rack.
Audio racks
I'm looking to upgrade my Sanus audio rack with a better wooden rack. I've checked out Timber Nation online and they look really nice, solid and affordable. During Axpona this year, I saw Butcher Block Acoustics now has their Rigidrack line which looks really nice as well---prices are comparable to Timber Nation. Both companies use maple and walnut. Are there others I should consider? How's the quality of each? Thanks!