Mismatched subs?

[Grasshopper]

Originally Posted by chessman

I would be more worried about sub placement than "mismatch." Imagine your room as a wooden box with a shallow amount of water in it. Then imagine sloshing the box around and looking at the water. You will notice that the water builds up in the corners and that there are peaks and dips where "standing waves" build up or cancel themselves out. Opposing midline subs is one school of thought on dealing with standing waves, but in the real world, you are better off experimenting at length to hear what works in your room. If it were me (and I already liked what I was hearing with the one sub placement) I would leave it there, put the second sub in my main listening seat, turn the volume knobs of each sub down to half of what the one sub had been set at, and then do the "floor crawl" to find the spot where the total bass sounds best. Put the second sub there. Then do frequency sweeps and adjust relative phase on the second sub to integrate it with the first one.

Or pay someone else to go through the "fun."

By the way, the reason the single sub between the speakers sounded so surprisingly good was that getting it out of the corner got rid of some the boundary induced room gain (water building up in corners) and putting it between your mains helped it stay in relative phase with your mains (peaks and dips in the rest of the room). Good luck.

Great feedback. Thank you!