Shortly after getting my AVM-20, I went out and bought the trusty RS analog SPL meter. I used it to set the levels of all of my speakers, including the subwoofer. Every time I changed a parameter, I recalibrated and made sure that all channels were at the same level. This produced pretty good results with movies, although I found that the surrounds didn't seem quite as prominent as I expected them to be. I chalked this up to my surrounds being dipoles and the physical characteristics of my room working against me. So, a few weeks ago, I read an article about bass management and decided to change my mains to be "small" in the AVM-20 and cross them over at 60 Hz. My mains are Paradigm Studio 100s, so their bass performance is quite capable. I set them up as small, ran the test tones and recalibrated. I made only some very minor adjustments (less than 2 dB). A few days later, I started listening to CDs on my system. ... and I hated every CD I listened to. As I listened to CD after CD, I thought "these are simply *horribly* recorded. They are nearly unlistenable." After I got to the 4th or 5th CD, I put two and two together and checked the configuration of my speakers. I had forgotten about having changed my mains to be "small". I adjusted the configuration to large mains and listened to another CD. Low and behold, I had *great* sound again! The missing bass, that was making every recording sound thin was back in spades. The fatiguing, beatless, lifeless sound I was getting was the sole result of not nearly enough bass in the reproduction. I was puzzled by this, as I carefully calibrated the subwoofer levels with the AVM-20 internal test tones and the RS SPL meter. This made me wonder about DVD movie sound as well. After all, even with mains set to large, the level of the subwoofer controls the level of the ".1" bass channel. So, I changed the mains back to small, put in a CD with fairly intense bass that I am *very* familiar with and started adjusting the sub level. I did this, not from the "levels" menu, but from the subwoofer "tweak" button. I adjusted it to +7 dB and did some listening. That was a little bass heavy. Back down to +6 dB provided a much closer to "real bass" level. Music now sounded fairly well balanced, compared to the mains being set to large. So, on to movies. I played a variety of bass heavy scenes, including the opening sequences of AOTC. The bass is now pretty impressive; much more than I've heard from my system in the past. This is no surprise of course; I'm sending four times the power to the sub compared to what I've been sending it for months. I'm left with a dilema though. I *know* how music should sound. I've listened to countless "stereo" systems over the years and I have a very good feel for tonal balance among other traits. So, I'm pretty confident that my settings of the subwoofer are approximately correct for music. For movies though, I don't have a great frame of reference. The vast majority of information below 60 Hz in movies is special effects. It's much harder for me personally to calibrate, by ear, to the sound of gunfire, or simulated explosions, than it is to calibrate with timpani, kick drum, bass guitar, and other "known" instruments. I'm left with some nagging questions: Why is the SPL meter calibrated configuration so obviously wrong for stereo recordings? This effect isn't subtle; It's *glaringly* obvious. Does the AVM-20 have some different behavior with stereo sources than with 5.1 sources? I.E., is the SPL meter based calibration reasonably accurate with 5.1 channel sources, but way off for 2 channel sources? Is my SPL meter simply broken? Is the AVM-20's bass management broken in some way? Any insight into this will be greatly appreciated. Thanks for reading. Brian.