These measurements represent the inner capacity of the case. If you are unsure about the fit for your keyboard, make sure it does not exceed any of the maximum dimensions shown just to be safe. This case is designed to fit most 61-key keyboard controllers including Nord Electro 3 61, M-Audio Axiom 61, Korg X50 61 and Akai MPK61. In a 49-key controller setup, use internal spacers.
See our Prophet 06 / OB-6 case on the Dave Smith Instruments website.