Due to budgetary constraints, I will have 2 M60's as fronts and a VP100 for my center channel. The 60's will be delivered in a couple more weeks, but I have a question...

Having this somewhat incomplete home theater system, is it necessary to calibrate it using an SPL meter?

Any recommendations on how to do it and with what meter would be greatly appreciated, thanks.

VP100, M60ti's, HSU STF-2, Marantz SR7200, 55" Mitsubishi