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    Bwap's Avatar
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    Add a tweeter or cross lower?

    I have recently constructed a pair of crossovers for my front stage.
    The crossover point is 2750hz, butterworth, for both the mid and the tweet.
    I feel that because the sensitivity is much higher on the 8" that there in quite and overlap at the crossover point. I am considering changing the low pass crossover on the 8" down to 2k. I don't know how this will pair with the tweeter, so I am asking you guys.

    Even at about -10db at 5000hz, the 8" still overpowers the tweet..
    I think it is the sensitivity difference, making them not pair nicely.

    The speakers I am using are:

    PowerBass 4XL-80-94 (4xl8094) 8" Competition Grade Composite
    and
    Morel MDT 12 1-1/8" Neodymium Tweeter 277-060

    Both sound amazing, I just don't know where to cross them to sound nice together.
    I was told 2750 would be fine, but there is definitely an overlapping issue.

    This is how they are wired, ignore the supertweeter.







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    Re: Add a tweeter or cross lower?

    Youre using a relatively loud 6" midrange with a tweeter that was never designed to be used in a car, and never designed to be loud. Buy a set of bullet tweeters and you will have that extra high end that you need.

    Edit: Just saw the Morels were 8ohm. Try running a set of these. Should work just fine. Just fine for a small setup.

    Selenium ST200 Super Tweeter 264-348




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    Re: Add a tweeter or cross lower?

    Quote Originally Posted by galacticmonkey View Post
    Youre using a relatively loud 6" midrange with a tweeter that was never designed to be used in a car, and never designed to be loud. Buy a set of bullet tweeters and you will have that extra high end that you need.

    Edit: Just saw the Morels were 8ohm. Try running a set of these. Should work just fine. Just fine for a small setup.

    Selenium ST200 Super Tweeter 264-348
    My problem is actually the overlap 3k+, Was planning on adding a supertweeter until I noticed how rough an overlap is.

    The morel sounds great, its just that the 8" screams the highs louder. I would rather the 8 play less highs, than add more to the higher end.




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    Re: Add a tweeter or cross lower?

    Im considering a 2k linkwits to see if it crosses better, as it is -6db at 3k and -12 at 4k.. it will slope harder, making the highs on the 8 fall off while the tweet is unaffected.




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    Re: Add a tweeter or cross lower?

    Anyone have any input?

    It would be nice to have some help solving this, as I was recommended from people on here where to cross at and against my better judgment went with it.. now I have the huge overlap.




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    Re: Add a tweeter or cross lower?

    Even if the 8 only plays to 2-3khz, its still going to be much louder than the tweeter. The tweeter isnt designed for a situation like that.

    Get a product that is.




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    Re: Add a tweeter or cross lower?

    Quote Originally Posted by Bwap View Post
    Anyone have any input?

    It would be nice to have some help solving this, as I was recommended from people on here where to cross at and against my better judgment went with it.. now I have the huge overlap.
    Passive crossovers have limitations and you've discovered one of them. The 8" mid might not be 4 ohms at the frequency you're trying to lowpass it. That plus the sensitivity differences and driver mounting locations (on/off axis etc) make it hard to dial a homemade passive system in without a lot of trial and error.

    At this point maybe you should consider an active solution where you can set the crossovers and speaker levels separately with just a twist of a knob. There are some nice 4 channel amps at reasonable cost that can do that for you.



    dave
    ----------
    1999 Buick Park Ave Ultra
    Head Unit: JVC KWHDR720
    EQ: Audiocontrol EQL
    Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
    Sub Stage: Boston G3 10", 0.5 cu ft sealed
    Amp: PPI Phantom 900.4
    Rear Fill: Boston SE953 6X9's

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    Re: Add a tweeter or cross lower?

    Quote Originally Posted by maylar View Post
    Passive crossovers have limitations and you've discovered one of them. The 8" mid might not be 4 ohms at the frequency you're trying to lowpass it. That plus the sensitivity differences and driver mounting locations (on/off axis etc) make it hard to dial a homemade passive system in without a lot of trial and error.

    At this point maybe you should consider an active solution where you can set the crossovers and speaker levels separately with just a twist of a knob. There are some nice 4 channel amps at reasonable cost that can do that for you.
    Already running 3 amps, these front speakers are being ran at about 240 watts from two channels of my rock four channel. so a channel per driver isn't an option.




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