God bless all of you maniacs out there with multiple subs. I love chest pounding bass as much as the next guy, so this is no knock on you. I have a fairly basic question. I will use my system as an example. I own an SVS 20-39 PC+. My calibration was fairly simple. I got out the Avia DVD, an SPL meter, and ran a test tone to set the 5 speakers and sub to the same db level. I never run my receiver any higher than -10 (which is really loud). The SVS is definitely a stud, and handles everything I throw at it without bottoming or audibly distorting. I love it. Now I have to admit that I contemplate adding a second sub from time to time (not because I am dissatisfied with the sound, but because I hear you guys rave about multiple sub setups and I am curious). If I were to add a second sub and recalibrate, wouldn't I simply be backing off on the subwoofer gain so that the two subs would match the db level of my speakers. In this case, how would there be any more bass while watching movies?