Hey guys, I am trying to figure out why I might be experiencing a null between 70-85hz when I play a sound sweep I found on Youtube.\nTesting in Stereo mode with Sub\nSpeakers are SVS Prime Towers, subwoofer is a Klipsch R10sw.\nDo I need to switch the phase switch or, move it? IDK, I currently have the sub so the driver is pointing into the front corner of the room about 3 ft from the wall.\nMy listening position is pretty much the ideal location for stereo.\nCan someone recommend what I should try and what software I might want to use?\nMy receiver is a Dennon AVR 3300?? Running Dolby Atmos 7.1.2 tuned with Audyssey xt32 I believe. My floors are real 3\/4" hardwood and a vaulted ceiling. Plenty of seating and carpets in the room (no echo) Prime seating is about 13' from the speakers and sub.\nAlso, when I went to listen to a number of subs, I chose the 10" because it sounded more punchy and responsive than the 12" I was planning to get a second one but never did. The 10" 300watt ported sub provides sufficient sound level for the room but it is a cheap sub with no DSP but no apparent issues with it.\nConsidering either getting a second subwoofer (only $220) or pulling out what I got and going with Pr of SB2000's or 3000's\nI have a great wife who says "Get what you want" but my inner cheapskate is saying try another Klipsch 10 before laying out 2 grand on subs as the improvement may not justify that much price difference. Besides I may want to upgrade to 7.2.4 Atmos later next year.\nWe listen to music and movies at medium to moderate levels, nothing super loud as our pets go crazy when I do.\n\nI would like to try fixing the null before buying new equipment.