Calling bassheads - setting crossover on sub

Discussion in 'Speakers' started by Jason GT, May 11, 2003.

  1. Jason GT

    Jason GT Second Unit

    Dec 12, 2002
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    Hi all,

    First off, this is not meant to be the typical crossover setting type question. [​IMG]

    Take a look at this article.

    On the lower left corner of first graph are freq response curves for a subwoofer, measured at different sub-level crossovers. As the crossover is turned down, the freq response flattens.

    My question is, has anyone deliberately turned down their sub crossovers to flatten sub frequency response? Any insight/tips/tricks on doing this?

    FWIW I'm running an HK 320, PSB Alpha Bs (good down to about 55-60 hz) and a Paradigm Pw-2200.
  2. Steve_Ma

    Steve_Ma Second Unit

    May 7, 2001
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    The optimal crossover point is going to be largely dependant upon the room as well as the sub and adjoining equipment.

    I have adjusted my sub's crossover in the past to experiment with the frequency response my room/equipment was giving my at different crossover points. My AVR has a fixed crossover of 100hz and I wanted to see if I could get a better response by lowering the cross and getting more from my mains.

    So of course I had to dump the line level connection and use the speaker level connections for the sub/mains. I changed the speaker settings in the AVR. I then used a test disk to play different test tones and I measured and charted my freq response at various crossover points ad nauseum.

    It was a great excersize that taught me alot about my room and my equipment. In the end: My line level connection and fixed 100hz crossover clearly gave me the flattest frequency response.

    My Advice: Get a test disk and make sure you chart your results at various points.
  3. Arup

    Arup Stunt Coordinator

    Apr 27, 2003
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    Since I have good bass capable towers attached to a high power amp, I use 60Hz for my sub setting and this gives me seamless blending with the towers.
  4. JohnDG

    JohnDG Stunt Coordinator

    Jul 15, 2000
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    Yep: I did this with Paradigm Monitor 7's and a PDR-10. In my setup, the 7's are corner loaded (unavoidable), so I got a hump at the crossover. By setting the sub's crossover within 10 Hz of the receiver's crossover, I was able to flatten the curve.

  5. JimmyK

    JimmyK Second Unit

    Jun 21, 2002
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    Real Name:
    My L&R speakers are strong down to 40hz, so I thought that a lower crossover point would benefit my system.

    After much measuring and experimenting, I found that my main speakers had a large bump between 80hz-125hz.

    The solution was to set my low pass crossover to 80hz, and the highpass to 150hz. Although this looks strange on paper, it actually resulted in a smooth response from 15hz on up through the treble region without having to apply any EQ.

    It pays to experiment.


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