Join Date: Dec 2007
Location: Central Michigan
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How to best connect odd number of small subwoofers to amp(s) to get best load config
I am trying to figure a way to connect 7, 4 ohm, subwoofers to an amp or two amps for my new BOSS platforms (1 per chair, 7 total). I have several amps that I could put in bridged mode and just run all 7 drivers off a single amp. However, I'm not sure if that is the best way. I don't mind if all 7 have the same exact same level and each chair feels the same.
My main question is if I connect 4 in series as a group (16 ohms), then 3 in series as a group (12 ohms), and then connect those two groups in parallel, I should get about 6.85 ohms. That's in the sweet spot for the amps I'm looking at using. However, will the group of 3 subs be "louder" than the group of 4 due to their lower total impedance as a group (12 vs 16 ohms)? If that is the case, which wouldn't be ideal, I'd be interested to know if anyone has a better way to do it? The issue I know is having a group of 3 and 4 vs having two groups of 4 drivers. If I do it in a stereo configuration instead, and run the group of 4 as a parallel/series connection (4 ohms total load) then I'd be great. However, with the group of three, in series they'd be a really low impedance (a bit too much power for the subs), and in parallel, I think too high an impedance (a bit too low power). My last resort option would be to just pair 6 of them up for 3 sets of 2, each pair in series, for 8 ohm loads per pair, and then just run the final single driver on its own and adjust the input gain accordingly to match the other 6. But then I have to use two amps and split my sub output from my AVR an additional time to feed two amps (4 total channels), which might be fine, but also could introduce noise.
Any insight on how to best manage this dilemma of connecting 7, 4ohm, subs would be appreciated!!
Last edited by luv2fly3; 10-05-2019 at 08:06 AM.