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Some product to keep cabinets off floor?

If you had a rig that was always the same weight and wanted to DIY an Auralex Gramma you could take two thin pieces of plywood and sandwich eight sorbothane discs or rings in between (from Isolate It! | Vibration Isolating & Damping Products ) keeping in mind that each disc would support a fraction of the weight of your rig. i.e. a 50 lb load could be supported by 8 sorbothane discs each with a load rating in the 6.25 lbs (50 lbs / 8 discs) range.

This doesn't get it off the ground but it's lightweight and I think it does make a difference on some stages.
 
Furniture dolly. Cheap, isolates the cab off the floor, and you can spin the whole rig easily if you realize halfway thru the gig that you forgot to plug in your extension cab. Um, that's what a friend told me, anyway.

buffalo-tools-dollies-hdfdolly-64_1000.jpg
 
The next time you're at a wedding, or some other function at a banquet hall, or at a restaurant with white tablecloths, take a look under the table cloth. 90 percent certain you'll see a table with essentially no visual appeal (most are plywood) - it's been chosen for portability and function - one reason round tables are so popular is you can fold up the legs and roll them (with one person) wherever they need to go. Still, people are impressed as hell, because they ate off a white table cloth. People's perception of beauty is, in this case, truly skin deep.

Follow that example - separate the issues of functionality and aesthetics, and get a a milk crate (functional) and a nice piece of cloth (visual impact). When you want to move it, turn the milk crate over, and put the cloth inside it, along with a few cables and such. Easy to move, looks good, done.
 
Does raising the cab off the floor adversely affect the sound??
Depends. I use an Acoustic Image Contra, with a down-firing 10" speaker. It's definitely meant to be be on the floor. But mostly, with front-firing speakers, I want the cab off the floor, preferably so it serve as a monitor as well as filling the room. Unless there's a full PA with monitors, etc, when it will depend on the setup.