J.B.
Yes, within the range of error of your SPL meter. The low-frequency errors inherent in the Radio Shack meter are significant. There is a correction table available on the internet if your meter is a Rat Shack model.
As you're no doubt aware, there are very large variations in low-frequency information from one source to another, CDs, analog vinyl, Dolby Digital 5.1 broadcasts and the like. I'm always adjusting my subwoofer level according to the source, by ear, to compensate for the vagaries of the source mix.
Alan
