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Connecting subwoofers of varying sizes can certainly produce a greater depth of sound that can improve quality. I would read up a bit on multiple speaker setups though. Based on what a lot of people here say, you generally want to run different size subwoofers in different frequency bands and minimize overlap.
So, for example, you'd want the 15" to play all sound up to, say, 55Hz, and then have the 12s handle everything from 55Hz to say, 100Hz, and then have your midrange speakers play everything above that. This way, the larger 15" sub isn't trying to reproduce the higher frequency bass that it isn't as good at, and likewise the 12's aren't struggling to hit lows. I hope this helps!
Does anyone else have ideas?
im gona be helping a friend do similar set up- 2 12" and 1 15"
how do u have the 12s play 55 to100 hz
i been thinking about how u could accieve this but i havent seen any products that could. tho i am kinda new to this kinda thing and i havent looked much
2002 Ford Focus JVC KD-A815 Sony CDX-GT410u Sony XT-100HD HD Tuner Stock speakers, no amp, no subs
cockerchrisjoe:wud this still sound better i had ppl recomment getting two 8" subs and then two 12's tht way it wud sound better but im not sure which wud sound better and 8's r hard to find sometimes other than like ebay or something.
If you have the option to pick up a 15" JL for a sweet price, I would try to pick up a couple of 8" JLs (for timbre matching) and sell the cheap 12s. The 15" will come up to say, 70Hz nicely and the 8s will go from there to 125 or so with no problem. This will take almost all the burden of bass off your main speakers and let them make music, while having optimum sized speakers for the bass. You will need an additional electronic crossover for this. I believe Crutchfield carries a couple that will do the job. You can run cables directly to the amp that is powering the 15 and use the amp's controls to set it up for 70 hz low pass. I'd use the subsonic filter set to 25, myself, but that's up to you. You'll need the crossover to send 70 and above high pass to the 8" speakers and then use the low pass filter on the amp set to about 125. I don't see any description of the rest of the system so I can't make suggestions as to setting the other speakers up.
If you are going to run the 8s in mono (they'll hit harder that way, but be slightly less musical) then you can use the Kicker KX2 crossover in a slick little setup. Set the high pass to 70Hz and the low pass to 125. Set the gain to about 9:00 on both high and low. Run a mono (subwoofer) signal into the left channel input. Take the left channel output of the high pass output and run it into the right channel input. Send the right channel of the low pass output to the amp. Viola - mono band pass crossover for the 8s. Tweak the gains as needed, but try to make small changes to both gains, rather than large changes to one.