I relyed on OPPOs tone generator for all channel level and crossover adjustment cues. This is because my Sony TA-P9000es is an all analog multi-channel preamp with very limited means to trim channels. I'm totally satisfied with results. I used a sound meter app on my iPhone, in addition to my ears to initially set levels. Setting the sub was most difficult, since low volume music generally requires more gain in the 40 to 20 cps region than when playing movies at a realistic level. But, now to my point about bass: in my scenario, initial set-up of level and crossover points presented too much surround channel bass violin presence in a few of my multi-channel Diana Krall multi-channel SACDs. Interestingly, I discovered my favorite listening position was too close to the surrounds; however, Instead of changing the OPPOs settings I just rearranged my sofa to accommodate more seating options.