Join Date: Feb 2001
Location: Whittier, Ca. USA
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Don't underestimate the importance of placement. Depending on your room, multiple bass sources can cancel each other and cause null/void. The more square a room is, the more likely this is to happen.
I found just a few inches of movement can make a difference when I was tuning two subs in my nearly square room 22x20x8. My marriage is svs and hsu. Both quite capable on their own, with the SVS being the more capable, I placed it in the rear corner along the same wall as the smaller HSU in front.
Video essentials has tones down to ~15Hz if I recall. With that dvd and a Radio Shack sound pressure meter, about 5 hours later, I was able to feel confident that the subs were working together and not conflicting.
edit: I installed this long before EQing everything was popular.