It's not a perfect fit, it's a bit big, but that's better than being too small so it will work out fine.

I bought 2 of these as I have 2 SCXD amps - excellent fit, not too tight, not too loose and almost seems slanted where the controls are, as if it was made just for it

This cover is a perfect fit for the GDEC 30.

Good fit, keeps my toddlers hands away from my knobs!!!