I've been trying to adjust the level of a new subwoofer on my AV8. To do this I've been carefully using the subwoofer trim and found that -5.5dB was about right. Having decided that this was the correct value I transfered the -5.5dB to the speaker level adjustments and set the subwoofer to -5.5dB and set the sub trim back to zero. To my shock the bass was well over the top way too much signal. I went back to trim -5.5dB and subwoofer level 0dB and all was fine again. So why is sub trim and subwoofer level not the same thing when set to -5.5dB? Is there some sort of conversion factor? Cheers, Bob.