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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.Quote:
Originally Posted by nfbertone
It should be in DIY I'd imagine.
I think it would be difficult to adjust 2440 with appropriated horn and 2405 efficiency without resistors network or L-padsQuote:
Originally Posted by nfbertone
He can always Bi/Tri amp.Quote:
Originally Posted by ivica
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.
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!!Quote:
Originally Posted by grumpy
Yes, but as it has been said : " ..Hallo everybody. I want to build a passive crossover between my JBL 2440 and my JBL 077...."Quote:
Originally Posted by Mike F
...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 worksQuote:
Originally Posted by ivica
Quote:
Originally Posted by nfbertone
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...Quote:
Originally Posted by ivica
What do you have against L-Pads may I ask?Quote:
Originally Posted by nfbertone
I do not expect a lot of music over 10kHz.Quote:
Originally Posted by nfbertone
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 brightQuote:
Originally Posted by ivica
Hi nfbertoneQuote:
Originally Posted by nfbertone
can You sketch your final network. It would useful for us.
Regards
Ivica