It is more accurate once you get out of the sub and low bass ranges. You need to figure in some fudging with low freqs. There's an excel worksheet that takes your raw RS SPL figures and turns them into real numbers for those ranges.

The only thing I had to boost higher was one of my surrounds. Don't know why, but it felt like it wasn't giving the umph at the SPL calibrated levels.

---- A Woofer in Tweeter's Clothing... M60s, VP150, QS8s, EP350 Onkyo TX-SR702, Denon DVD-3910