Just got the JBL PB12 sub a few days ago, and pretty happy with it so far. However, the specs state the frequency response is from 25 - 150Hz, and I'm thinking mine doesn't go all the way down to 25. When I run the low frequency sweep on the Avia disc the sub seems to cut off dramatically around 36Hz, and I'm wondering if I'm just expecting too much or if there's a problem. FWIW, I'm running the Subwoofer Line Level out from my receiver to the left input on the sub's line level inputs, and the "LFE toggle Switch" on the sub is set at "LFE", which I'm told bypasses the sub's crossover and uses the internal one on my receiver, which is set at 100Hz (damn you Pioneer!). All my main speaakers are set to "small". I played around with the phase switch on the sub which didn't make a drastic difference one way or the other. The sub does sound very good for both music and movies, but I'm wondering if it shouldn't go deeper based on the Avia results. Do I have something hooked up wrong, or am I just expecting too much from the Avia low frequency sweep? Thanks for any help.