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Old 2nd September 2008, 05:34 PM   #1
EV2181 is offline EV2181  Canada
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Hello

I recently purchased some JBL 2226h speakers as well as EV DH1A drivers with HP940 horns and could use some tips on pairing them properly in the right 2-way cabinet (i.e. size, vents etc.). I don’t want huge cabinets, but don’t want anything too small and complex either.

I will use them mainly for a band rehearsal space powered with QSC amplification. I would like to cross them over passively (500, 800 Hz or 1.2 kHz?) but if bi-amp is highly recommended, I guess that will be what I do. I would like them to be efficient, and I want them to have plenty of bottom end but nothing ‘boxy’ or sloppy.

Any help would be appreciated, or if you could point me in the right direction...and if you have any questions, comments or dirty jokes, just let me know. I have done a search for info, but I think I was too tired at the time to see anything that was of interest.

Thank you
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Old 3rd September 2008, 06:32 AM   #2
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Hi EV,

Somewhere on the web I read a primer for designing driver/horn cabinet/crossovers, but I did not keep a copy and cannot find it via searching.
Maybe someone else can link you to it.

Cheers ......... Graham.
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Old 3rd September 2008, 11:51 AM   #3
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For the 2226 use JBL's recommended enclosure size and tuning, see the link. Take a look at the Pi speaker site I think Wayne still uses 2226's in the same configuration you want to use them in. The low frequency cut off of the horn will be what determines your lowest crossover point.

http://www.jblpro.com/pub/manuals/enclgde.pdf


Rob
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Old 3rd September 2008, 10:00 PM   #4
EV2181 is offline EV2181  Canada
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Thank you, Graham. I'd be interested in seeing that info.

Thank you, Rob, for that JBL link. That will be useful.

I have one question, and you might think I'm a 'Noob', but what is "Pi speaker site"? I'll give it a look if I knew what it was.

Thanks again,
Mark
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Old 3rd September 2008, 10:38 PM   #5
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Here you go

http://www.pispeakers.com/

Have fun with that stuff!


Rob
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Old 4th September 2008, 07:42 AM   #6
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Hi Rob,

Yes that leads to the document I was thinking of; -

http://www.pispeakers.com/Speaker_Crossover.doc

I believe this one states a warning that the simple L+C should *not* routinely be connected straight to a LF or mid-bass driver due to the C introducing a small resonant peak with the driver which the amplifier cannot damp due to the series L. Or was it to *not* connect a C+L directly to a mid/horn ? Same principle > resonance not damped by amplifier due to series impedance.
Resistors and other components are necessary for reproduction to be as clean as software suggests is possible, and of course experienced designers know this.

However the need for other components is often NOT mentioned in some of the simplistic software programs available for designing crossovers, and thus without realising, some constructors will be buying into a less than optimum system !


Cheers ......... Graham.
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