The main speakers in my home sound system are Infinity Interlude 60s. The IL60s are powered towers, each with a 12" 500 Watt subwoofer. I recently changed receivers from a Panasonic SA-HE200 to a Harman/Kardon AVR8000. I've set all the speakers to small, and the subwoofer crossover at 80Hz. So far, so good. The subs in the IL60's feature Infinity's RABOS system and I purchased the RABOS kit and have made the adjustments. To "dial in" the bass, I first tried using the test tones for this purpose on the RABOS CD and after playing the tones and setting the levels, I played some music. Where's the bass, I thought? To confirm the settings, I popped in AVIA and used the 2-channel analog output from the DVD player. I got a considerably different reading (~+5db) so I made the adjustments and played the same music again. Much better, but still not quite what I expected. There's a common misconception regarding the amount of bass you're 'supposed' to hear, so I just chalked it up to that and left things alone. I switched the receiver over to digital input and used AVIA to set the levels for Dolby Digital (the H/K remembers different levels for pretty much every sound mode and input). I've watched plenty of DVDs since then and although the bass is definitely audible and sometimes even room-shaking, it still seemed like I was getting less than you would expect from TWO 500W subs. Last night, on a whim, a decided to play the internal test tones on the H/K. To my utter amazement, those tones indicated a NINE dB increase in sub volume! We watched a couple of DVDs and now the bass is definitely there! I'm listening to music right now in the background and the bass is unmistakingly present. But is it correct, or actually too much? Now I'm just totally confused! How can every single test I throw at it come up with different results?! What's most accurate? Did I have the right amount of bass before, or is it correct now? How the heck can I tell for sure?!