Chooser, yes it's quite likely that the setting of the sub level is accurate(at least as accurate as a manual setting using a separate meter, which isn't really that accurate), but since you paid good money for it you're expecting to hear more. The idea is that the sub shouldn't be heard as a separate sound source, but rather that the speakers are putting out more bass. Of course, it is your money, so if you really want to, raise the sub level 3-4dB over what was calibrated.

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Enjoy the music, not the equipment.