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Thread: passive crossover JBL 077

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    passive crossover JBL 077

    Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077. I dont want to use any L-Pad!I found a passive crossover (www) : 1,0uF seriel ; 0,16mh parallel ; 1,5 uF seriel after this the L-Pad 8Ohm.... an than a 20 Ohm-10W parallel to the JBL 077.Can I build the crossover without the L-Pad? Drawbacks? when I did not use the L-Pad? Has anybody experiences? Or an idea to build a other crossover? I think 8kz - 10kz is perfekt .Thanks a lot, Nobby

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    Heather [Senorita member] hjames's Avatar
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    Quote Originally Posted by nfbertone View Post
    Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077. I dont want to use any L-Pad!I found a passive crossover (www) : 1,0uF seriel ; 0,16mh parallel ; 1,5 uF seriel after this the L-Pad 8Ohm.... an than a 20 Ohm-10W parallel to the JBL 077.Can I build the crossover without the L-Pad? Drawbacks? when I did not use the L-Pad? Has anybody experiences? Or an idea to build a other crossover? I think 8kz - 10kz is perfekt .Thanks a lot, Nobby
    Didn't you post this same comment once already.
    It should be in DIY I'd imagine.
    2ch: RPi-4, Oppo, Acurus RL-11,Jolida 502,Valencias,JBL L212,Von Schw
    7: Oppo BDP103D, B&K, UREI 809A, JBL B460

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    Senior Member ivica's Avatar
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    Quote Originally Posted by nfbertone View Post
    Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077. I dont want to use any L-Pad!I found a passive crossover (www) : 1,0uF seriel ; 0,16mh parallel ; 1,5 uF seriel after this the L-Pad 8Ohm.... an than a 20 Ohm-10W parallel to the JBL 077.Can I build the crossover without the L-Pad? Drawbacks? when I did not use the L-Pad? Has anybody experiences? Or an idea to build a other crossover? I think 8kz - 10kz is perfekt .Thanks a lot, Nobby
    I think it would be difficult to adjust 2440 with appropriated horn and 2405 efficiency without resistors network or L-pads

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    Senior Member Mike F's Avatar
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    Quote Originally Posted by ivica View Post
    I think it would be difficult to adjust 2440 with appropriated horn and 2405 efficiency without resistors network or L-pads
    He can always Bi/Tri amp.

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    Senior Member grumpy's Avatar
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    Nothing was said about not using resistor networks, that I noticed...

    Just use the same resistor values that would be in effect for the L-pad
    at an appropriate static setting.

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    Thank for the advice

    Quote Originally Posted by grumpy View Post
    Nothing was said about not using resistor networks, that I noticed... Just use the same resistor values that would be in effect for the L-padat an appropriate static setting.
    Thank for answer! O.K. first I i will test it without any resistor to the mid-high horn. And than with differnet fixed resistors... At the moment I use one Cap 1,8uF seriel to the 077. I will test the other version...without any L-Pad, I hope the crossover from horn to the 077 will be better fit....I will told you....best regards from Germany!!

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    Senior Member ivica's Avatar
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    Quote Originally Posted by Mike F View Post
    He can always Bi/Tri amp.
    Yes, but as it has been said : " ..Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077...."

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    Quote Originally Posted by ivica View Post
    Yes, but as it has been said : " ..Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077...."
    ...now to the 077: 1.0uF serial --------- 1,5mh parallel---------1.5uF serial -----------20Ohm 10W parallelIts sound very good! Hi Grumpy, hi Ivica, .... I think, I had to use some resitors to the horn-driver. I will check the sound with resistors -4db or -5 db...hope it works

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    Senior Member ivica's Avatar
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    Quote Originally Posted by nfbertone View Post
    ...now to the 077: 1.0uF serial --------- 1,5mh parallel---------1.5uF serial -----------20Ohm 10W parallelIts sound very good! Hi Grumpy, hi Ivica, .... I think, I had to use some resitors to the horn-driver. I will check the sound with resistors -4db or -5 db...hope it works

    1.
    I believe that You have mentioned 0.15mH instead of 1.5mH, because 1.5mH is tooooo much.
    2.
    take care that the characteristic impedance that the crossover "can see" remains about I think 8 Ohms.
    3.
    I have made an experiment with 0.16mH in serial with 1.5 uF cap. That would 'enhace' UHF region over 15 kHz, where 077 may has some deep in FR response

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    Quote Originally Posted by ivica View Post
    1.I believe that You have mentioned 0.15mH instead of 1.5mH, because 1.5mH is tooooo much.2.take care that the characteristic impedance that the crossover "can see" remains about I think 8 Ohms.3.I have made an experiment with 0.16mH in serial with 1.5 uF cap. That would 'enhace' UHF region over 15 kHz, where 077 may has some deep in FR response
    ....what a mistake I wrote....0.15mh I used :-)) ....but with resitors to the horn driver the sound is disappointment. And without resistors the horn is toooooo superficial...

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    Senior Member Mike F's Avatar
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    Quote Originally Posted by nfbertone View Post
    ....what a mistake I wrote....0.15mh I used :-)) ....but with resitors to the horn driver the sound is disappointment. And without resistors the horn is toooooo superficial...
    What do you have against L-Pads may I ask?

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    Senior Member ivica's Avatar
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    Quote Originally Posted by nfbertone View Post
    ....what a mistake I wrote....0.15mh I used :-)) ....but with resitors to the horn driver the sound is disappointment. And without resistors the horn is toooooo superficial...
    I do not expect a lot of music over 10kHz.
    You can try with R1=4 Ohms in series with the network 1.5uF cap, and R2=6 Ohms in parallel with 2405. i would expect about 6 dB loss in such combination, while the loading for the network would remain about 8 Ohms.

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    Quote Originally Posted by ivica View Post
    I do not expect a lot of music over 10kHz.You can try with R1=4 Ohms in series with the network 1.5uF cap, and R2=6 Ohms in parallel with 2405. i would expect about 6 dB loss in such combination, while the loading for the network would remain about 8 Ohms.
    ...I dont want to use an L-Pad, because in my experience the sound loose a lot of dynamics. I had try the following resistors . 4Ohm ser. & 6Ohm par. //// 0,22 mh ser. + 1,8uF para. to the horn driver. I will listen to the sound few times... the first sound check was bright

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    Senior Member ivica's Avatar
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    Quote Originally Posted by nfbertone View Post
    ...I dont want to use an L-Pad, because in my experience the sound loose a lot of dynamics. I had try the following resistors . 4Ohm ser. & 6Ohm par. //// 0,22 mh ser. + 1,8uF para. to the horn driver. I will listen to the sound few times... the first sound check was bright
    Hi nfbertone

    can You sketch your final network. It would useful for us.

    Regards
    Ivica

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