Ichigo, that +3.5 looks better than -12(remember though, there's no "gain" knob, it's a volume control). You said in an earlier post that you had the impression that the sub wasn't a separate sound, just part of the whole picture. That's the way that it's supposed to be: when correctly calibrated the impression should be that the sub isn't working but the speakers are putting out more bass. I have mine calibrated that way, but many want to run their sub several dBs "hot" so that they can "hear" what they've paid good money for.

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Enjoy the music, not the equipment.