WFO To The End

I am not sure what the topic was but I have a question for anybody that might ca answer. I am running dual subwoofers, A SVS PB 12 ultra with a 800 watt amp and a Klipsch sw-450 pushing 200 watts, these are RMS, the peaks are 2300 and 450. When the phase on the klipsch is at 0 the bass below 40 is much stronger with both subs on but the bass above 40 is down with both subs. When the phase is at 180, everything is reversed. below 40 is down and above 40 is up. The SVS has a variable phase control. it can be set anywhere from 0 to 180 in increments of 1. Should i experiment with the svs phase, the sub weighs 135 lbs and the control is in the back, hard to get to . The SVS also has extensive bass management wit the use of a mike and sortware called room eq wizard. this is a last resort.because of the time factor. My e-mail is 1981mp@suddenlink.net if anybody has any suggestions.