Mark, the "best" for the RS type of money is the RS, i.e., the digital model. It's what I use for comparing sound levels at various points during listening to music and has a clear advantage over the analog model(when available)in measuring max sound levels both short term and long term. I don't use the meter for calibrating levels, since there's no good reason to believe that the RS SPL meter is more accurate than those used in Audyssey, MCACC, YPAO, etc.
Don't follow the "out of whack" comment. As was said above, the low setting on the sub channel indicates that the level control on the back of the sub should be set lower for the auto-calibration. Any of these auto-calibration systems should, if anything, be more accurate than a manual calibration which has the added element of human error.
