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crossover help

kostakis87kostakis87 Posts: 6
edited February 2018 in PA Configuration Wizard
hi guys! i'm happy i find you here!
i recently purchased driverack pa2 , i used to use a 3 way active crossover for my setup but finally i upgraded ...
i have q pair of 3way speakers custom made by me,the woofers are jbl2258 for lows 2123 for mids and jbl selenium d220ti for highs...
my question is i can't *blend* successful the mids with the low... it seems that mids and lows blend well but the low woofer sub seems to play like dumb... i know that 2123 works from 100 to 500hz at -8db so i guess there's a *hole* there which the woofers don't blend the frequencies well ... my question is what slopes or filters shall i use to blend all the frequencies of the woofers low mid and high correct... is it only a crossover thing or there is more which obviously i dont understand... thank you very much for your help and sorry for the mess

Comments

  • DraDra Posts: 3,844
    Tune a tri amp system is not easy. I suppose, the best way for you, will be to use the auto EQ function.
    As a general rule, use LR24 filters between all drivers and BW18 for the lows roll-off.

    Start here.
    2258:
    45hz BW18 - 150hz LR24
    2123:
    150hz LR24 - 2Khz LR24
    D220ti:
    2K LR24
  • Dra wrote:
    Tune a tri amp system is not easy. I suppose, the best way for you, will be to use the auto EQ function.
    As a general rule, use LR24 filters between all drivers and BW18 for the lows roll-off.

    Start here.
    2258:
    45hz BW18 - 150hz LR24
    2123:
    150hz LR24 - 2Khz LR24
    D220ti:
    2K LR24

    so i have to use the parametric eq to bring the 2123 flat from 250hz to 1000hz ?
  • DraDra Posts: 3,844
    kostakis87 wrote:
    Dra wrote:
    Tune a tri amp system is not easy. I suppose, the best way for you, will be to use the auto EQ function.
    As a general rule, use LR24 filters between all drivers and BW18 for the lows roll-off.

    Start here.
    2258:
    45hz BW18 - 150hz LR24
    2123:
    150hz LR24 - 2Khz LR24
    D220ti:
    2K LR24

    so i have to use the parametric eq to bring the 2123 flat from 250hz to 1000hz ?

    Did you mean 150 to 2000? 1000 puts a lot of load on the horn.

    Yes. Use the output PEQs to flatten and the gains to level.
  • Dra wrote:
    kostakis87 wrote:
    Dra wrote:
    Tune a tri amp system is not easy. I suppose, the best way for you, will be to use the auto EQ function.
    As a general rule, use LR24 filters between all drivers and BW18 for the lows roll-off.

    Start here.
    2258:
    45hz BW18 - 150hz LR24
    2123:
    150hz LR24 - 2Khz LR24
    D220ti:
    2K LR24

    so i have to use the parametric eq to bring the 2123 flat from 250hz to 1000hz ?

    Did you mean 150 to 2000? 1000 puts a lot of load on the horn.

    Yes. Use the output PEQs to flatten and the gains to level.

    yes i ment 150-2000, but the 2123 jbl data sheet says that recommended cross for these woofers are 250hz... shall i put 250 or 150 ?
    also if i let it auto eq with the rta mic, will it be flatten by itself (through the process of auto eq)the 2123 drive ? or i have to go by myself to do it through the output PEQS manually?
    thank you and sorry for all the mess !
  • DraDra Posts: 3,844
    After the auto EQ you should transfer the info to the output PEQs to free up the main EQ. The reason I said 150 is 250 allows a lot of the male voice and low guitar to get into the woofer (sub).
  • Dra wrote:
    After the auto EQ you should transfer the info to the output PEQs to free up the main EQ. The reason I said 150 is 250 allows a lot of the male voice and low guitar to get into the woofer (sub).

    ahhhh i see! so i freeing up the main eq by activating the peq's with the info that the auto eq have created! so clever!!

    tell me what shall i do with the 2123 ? 250 or 150 or 200 ? shall i use 150 by your experience or to trust jbl sheet 250 crosspoint ? thank you very much for your help Sir. !
  • DraDra Posts: 3,844
    I would start with 150hz. The speaker is naturally down about 3db there so you may have to do some additional work there is there is a dip in the response with x-over right on top of it. Gotta start somewhere, right?
  • Dra wrote:
    I would start with 150hz. The speaker is naturally down about 3db there so you may have to do some additional work there is there is a dip in the response with x-over right on top of it. Gotta start somewhere, right?

    thank you so much! i have much work to do !!! thank you again
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