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Crossover assistance....

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  • Crossover assistance....

    I'm trying to get rid of the "bump" in the response just above 1kHz.* Any ideas? ZMA and FRD files are available if required.* The two drivers are coaxially-mounted, which I suspect is what's causing that peak. Acoustic x-over is around 2.9kHz.* It can go higher, but should not go lower than maybe 2.5kHz (The tweeter is an ND2F8, but this is a car audio build where power-handling is a bit more important). You can ignore the illustrated response below 900 Hz and about about 7kHz..
    Brian Steele
    www.diysubwoofers.org

  • #2
    Might have to notch it out. If it is car audio could you go active xover?

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    • #3

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      • #4
        A bigger coil on the woofer should bring it down.* Then adjust your shunt cap(s) to bring the roll off back to where you want it.

        Dan
        _____________________________
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        • #5
          If you post the FRDs and ZMAs and the offset I'll share the stepped low pass alternative to a notch.
          John H

          Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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          • #6
            Your negative summing (around 3.5k) suggests a phase problem . . . so maybe try a 3rd order LP? Which woofer btw (OR, post up your F/Z files)?

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            • #7
              Ok, here are the FRD and ZMA files for the drivers in question (SF 6.5" and ND28F) measured in the installed location. The drivers are coaxially-mounted with a z of 2.75" (derived). Thanks..!
              Attached Files
              Brian Steele
              www.diysubwoofers.org

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              • #8
                Brian what was the environment for the measurements and is it how you plan to use them?
                *Looks like you have no baffle step at all, did you have some amount in mind 3, 6 dB or ....?

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                • #9
                  Hi Pete, they were measured at their installed position in the car.
                  Brian Steele
                  www.diysubwoofers.org

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                  • #10
                    Here's an idea.**
                    John H

                    Synergy Horn, SLS-85, BMR-3L, Mini-TL, BR-2, Titan OB, B452, Udique, Vultus, Latus1, Seriatim, Aperivox,Pencil Tower

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                    • #11
                      "Everything is nothing without a high sound quality." (Sure Electronics)

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                      • #12
                        Originally posted by Brian Steele View Post
                        Ok, here are the FRD and ZMA files for the drivers in question (SF 6.5" and ND28F) measured in the installed location. The drivers are coaxially-mounted with a z of 2.75" (derived). Thanks..!
                        Did you try adding the LCR I suggested?

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                        • #13
                          I used those same woofers in my Santa Fe with the Peerless OC25SC65 soft domes, but not a coaxial config. Could your bump be a rear reflection from the exterior door panel?*
                          Co-conspirator in the development of the "CR Gnarly Fidelity Reduction Unit" - Registered Trademark, Patent Pending.

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                          • #14
                            That's quite possible. I really haven't done too much research into the cause.

                            Those Peerless drivers are interesting. How did you mount them in your car?

                            I used to use Seas neo tweeters which sounded amazing, but the heat in the car eventually got to them - noticeable distortion below 6kHz or so. I'm replacing them all with ND28s,
                            Brian Steele
                            www.diysubwoofers.org

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                            • #15
                              This was done differently than I suggested. After reading your first post again, this may be crossed a little too low.
                              Attached Files

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