I have a Yamaha RX-V530, JBL NSP1 II speakers, and a DLS 10. I'm using my PlayStation 2 as the source using digital optical cable. I have calibrated my HT with Video Essentials, 75 db all speakers and 83 db for LFE. Movies sound good at -20 db from ref. level. Lower than that and bass doesn't sound so good. When I listen to audio, there is very little bass. Is it because I've calibrated to Dolby spec? How do you calibrate for audio?