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Questions on dual 2226 woofer cabinets [message #35305] Mon, 04 March 2002 12:23 Go to next message
jlharden is currently offline  jlharden
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Registered: May 2009
Viscount
Hi Wayne and group!

Seems more than one of us jumped in on the "to good to be true deal" of the dual 2226J's with the 4648A cabs. I too, without considering the multitude of problems when using an array instead of a single driver. Perhaps, a good implementation would be to use a 2380 horn and 2446 motor, this would let us cross much earlier hopefully dodging the "problems" that arise with the dual woofers. Could you please advise us of the necessary compensation to match the 2446/2380 hf system to the 100 db. lf system? Also with your experience with the 2226 woofers, what value of inductor would you suggest when lowering our crossover "event"? I understand if you want to avoid this one as it really doesn't have much to do with your design offerings! Thanks! Jerrod

Re: Here's a link [message #35306 is a reply to message #35305] Mon, 04 March 2002 13:41 Go to previous messageGo to next message
BillEpstein is currently offline  BillEpstein
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Registered: May 2009
Illuminati (2nd Degree)
And more by searching "JBL"
Use an 600-800Hz crossover on the 2446 [message #35308 is a reply to message #35305] Mon, 04 March 2002 15:04 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
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Registered: January 2001
Illuminati (33rd Degree)
I've just sent to your E-Mail address the schematic for the 600Hz and the 800Hz passive networks used in π Speakers containing 2" exit drivers on horns having cutoff not to exceed 500Hz.
Thanks, Bill! [message #35309 is a reply to message #35306] Mon, 04 March 2002 15:11 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18792
Registered: January 2001
Illuminati (33rd Degree)
Really - Thanks.

But Jerrod and I have had a long running dialog about speakers, and I think he was asking about an implementation using a lower crossover, to limit comb filtering from dual drivers in the midrange. He already has the schematics and all information about the π Speakers 1K6 passive crossovers. This implementation is just a little bit different.

Re: Use an 600-800Hz crossover on the 2446 [message #35310 is a reply to message #35308] Mon, 04 March 2002 17:11 Go to previous messageGo to next message
jlharden is currently offline  jlharden
Messages: 94
Registered: May 2009
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Thanks Wayne!

Is the lf section of the crossover appropriate for the dual 2226J's? Thanks for the 2446 schematics. Thanks! Jerrod

Re: Use an 600-800Hz crossover on the 2446 [message #35314 is a reply to message #35310] Mon, 04 March 2002 22:56 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18792
Registered: January 2001
Illuminati (33rd Degree)
If you plan to use two woofers, I'd run it as a 2.5-way, with just a large coil on the lower woofer to limit its output to bass only. The upper woofer would be a midwoofer, and it should be connected using the π crossover. Be sure to use a Zobel on the midwoofer to prevent peaking near the crossover frequency.
Re: Use an 600-800Hz crossover on the 2446 [message #35323 is a reply to message #35314] Tue, 05 March 2002 15:21 Go to previous messageGo to next message
jlharden is currently offline  jlharden
Messages: 94
Registered: May 2009
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Hi Wayne!

I'm assuming the schematic you forwarded has the zobel in place? If so I can just copy the schematic part for part while substituting the component values to attain proper attenuation? Jerrod

Re: Use an 600-800Hz crossover on the 2446 [message #35329 is a reply to message #35323] Tue, 05 March 2002 20:06 Go to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18792
Registered: January 2001
Illuminati (33rd Degree)
That's right, exactly.
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