Car subwoofer tuning

Discussion in 'Off-Topic' started by J_Mac, Jul 28, 2017.

  1. J_Mac

    J_Mac SS.org Regular

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    How do you guys tune your subs? I'm struggling with very low mid (higher low tone, around 200Hz ish) definition. High crossover setting seems to clash with my under seat woofers and make things flabby and ill-defined. I seem to be happiest at 50Hz crossover with lower gain. Just wondered if anyone has any tips/tweaks before I start replacing more speakers...

    Setup: BMW NBT head unit, stock under seat 8" subs, Focal 4" mids and 1" door tweeters, Rockford amp and 10" non-ported sub.
     
  2. jaxadam

    jaxadam SS.org Regular

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    What are you using for an eq? Just head unit?

    I have an active crossover in my truck, but I'm also low passing at 80 hz. This may sound counterintuitive, but I'll bump frequencies on my eq that I think are troublesome. Most speakers these days are tuned very well so I'm running a little gain off the amps and crossover and not really bumping too much on the eq.

    Setup: Sony head unit, arc audio idx active crossover, hertz mille components, hertz hdp5 amp, and JL audio 13tw5 sub.
     
  3. J_Mac

    J_Mac SS.org Regular

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    The head unit doesn't have more than bass/treble adjustment. Unfortunately there is no way to put an aftermarket head unit in my X3. I have iPhone and iPod rockbox eq controls though.
     
  4. Ernesto

    Ernesto SS.org Regular

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    I used to build competition systems. If you're going for music and not just bass, I'd recommend a much higher crossover point. I used to use 120hz on a cerwin vega hed12 and got perfect rta scores. If you're getting cancellation or harmonics, play with speaker phase and placement. An X3 is going to boost bass in the 50-80hz range due to wavelengths so you might want to experiment with bumping up the crossover point and reducing the sub gain. Also, if your midranges are competing with your subs, some capacitors inline to them would easily cut the bass out. There's a nice crossover calculator at the12v.com
     
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  5. J_Mac

    J_Mac SS.org Regular

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    Epic advice man, I will try this tomorrow!
    That makes sense about the caps, it’s my under-seat 8” speakers that get woolly. I was going to replace them with Earthquake SWS to get some clarity. Expensive though!
     
  6. jaxadam

    jaxadam SS.org Regular

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    I'm glad you came in and brought some of this stuff up. It made me go look and realize my crossover settings were all messed up on my active crossover unit (long story short is there are push buttons for either 1x or 10x on the mid and high channels and they sometimes get pushed in or out with shit rolling around under the seat). So I got those ranges back to normal (actually bumped the tweeters xover point up a little more) and bumped the sub up to 120 hz and I think it did make a difference. I also turned the gain down on it as well. I'm high passing at I think 80 hz, but am thinking of dropping that down as well. It sounds better but I'm not sure how well it will hold up with prolonged high volume.
     
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