Multi-sub. Does it work?
In this video I show a fairly rough test I ran using the 4 infinite baffle subs that are located in the front wall of my listening room. I also have a smaller sub that I can move around and I put that in 6 different locations to see the results.
Just from measuring the 4 fixed subs I can easily see that the frequency response improved. It was flatter without any of the dips the individual subs had on their own.
Adding in the mobile sub gave a solid boost in the low end, even though the output from that sub is a lot lower than the fixed subs.
So yes, the multiple subwoofer concept is a winner, in that it greatly improves the measured frequency response at the listening position.
However, I did not see a significant difference in the reverb time from one setup to the next. One of the claims for the multi-sub setup is that it can "fix" room modes, but I see no evidence of that. Granted, I didn't run through every possible position for the mobile sub and my fixed subs can't be moved at all. Also, my room is fairly well treated to deal with low frequency reverb and maybe the effect would be more obvious in an untreated room.
I'm inclined to think that if you can effectively nullify a room mode by careful positioning of an additional sub, it's going to be a very tricky task. You'd DEFINITELY need to run measurements to check whether you are actually producing an improvement, and that would take a lot of time.
And after all that, would the improvement be significant? Like I said, I saw NO real difference in the reverb time with each test, but I DID see a significant response improvement.
The 6 locations for the mobile sub were side left, side right, middle of the room, back corner left, back corner right and middle of the back wall. I'm pretty sure the best response was with the sub on the right side, with middle of the back wall a very close second. Since the middle of the back wall is the most suitable, that's where a new subwoofer will go (yes! future build!).
My room is 14' x 14' with an 7' ceiling. The dominant room modes are at around 38Hz and 70Hz. I've done extensive work to acoustically treat the room to reduce the reverb time and I have a few videos on this channel showing what I did, so please check those out.
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