Hey All,
I have a set of JBL 2380A horns with 2445J drivers on the back. I need new diaphragms for the drivers. Do I really need to get the 16 ohm diaphragms or could I get the 8 ohm ones which would be better and require less power as they are less resistive? Any help is greatly appreciated.
TY in Advance,
Eric
I have a couple sets of same 2445 and 2380 siting here. I also have a brand new pair of unused D8R2445 phragms if you are interested.
The 8 ohmers are less resistive and really pack a wollop.
Scotty.
One step above: "Two Tin Cans and a String!"
Longtime Alaskan Low-Fi Guy - E=MC² ±3db
Will they work in my 2445's? If so how much are you wanting for them?
I've used the same setup with good results in a home setting. I'd first ask why the 'phrams are blown before embarking on what to do about replacements. Can you tell us more about your installation?
Impedance decisions would seem to be driven by what a passive crossover would require in order to work properly.
Lastly, be aware that the 2380s are CD horns and will need to have the compensation applied by the crossover - passive or electronic - to provide proper dispersion and sound quality.
Might that be related to the blown 'phrams?
Cheers,
David
What do you mean by CD horns? And yes, I've concluded that the diaphragms were blown due to the absence of any crossover. I bought them from a pawn shop and wasn't very knowledgeable about pro audio speakers at that point, I had only dealt with home and/or car audio speakers which typically most don't need crossovers...at least the ones I have messed with that were factory original didn't have any. Anyway, I did post another thread for the crossover issue.Originally Posted by doodlebug
http://www.audioheritage.org/vbullet...528#post262528
That thread details the setup I have much more than I did in this one. It also has a couple of my questions about crossovers, so if you can help out there as well I'd be greatly appreciative.
Thank You
What I meant was Constant Directivity horns. For an inexpensive and flexible entry into the use of the drivers and the horns, I'd suggest an electronic crossover with the CD equalization built into the crossover. I use the Behringer CX-3400, which allows me to dial in the crossover points, phase, and delay characteristics.
You'll find them inexpensive and flexible but will need an extra amp, of course, with a woofer. Spend some time here and you'll also discover that a DC block cap is recommended in series with the compression horns when you use them in a bi-amped setup.
BTW, your experience with car installations would imply that the crossovers are typically built into the amps themselves. You still had some of the controls on them like crossover points. It is just that you now get to deal with the crossover in a separate box.
Hope that helps. There are folks here who are far more knowledgeable about this sort of stuff than I. Read and understand from them as they've been _very_ helpful to me in learning about the JBL pro stuff.
Cheers,
David
Ah ha, see, I knew what he was talking about I just didn't piece together CD and compression driver
Wow, I musta read it then responded 2 seconds after
I have a Crate Pro Audio LS4-XO. Would that be a sufficient substitution?
http://www.musicresourcesusa.com/mus...dio/ls4-xo.pdf
yes. will need more amps though, as you noted early on... in the other thread.
This model has the CD equalization switch on both channels. See page 6 of your owner's manual for the details. According to it, 12db boost is provided for this model and is fixed. This might be a bit agressive for the 2380/2445J horn but I have experience only with the Behringer and the original 3152 passive crossover network. IIRC, the Behringer CX3400 runs about 1/2 of that boost at 6dB.
I can assure you, though, that you will get much better results with equalization to compensate for the horn's dispersion characteristics.
BTW, I assume you're planning for use in a residential setting. If this is intended for pro/high volume use, then you'll need to consider other aspects such as power handling, directiity, max room size, crowd noise, etc. This is not my area of expertise but you have others here that do this for a living.
Cheers,
David
David's right. Would be better to have adj. frequency and amplitude for
correctly EQ'ing that particular CD horn design.
I was reading between the lines, saw the word "sufficient",
and figured the goal was to get up and running on a shoestring budget.
Some external EQ or at least a 'treble' knob may help there.
Yeah, it is just a residential HT setup I am trying to set up. And yes, trying to do a shoestring budget as of now. Then upgrade to bigger/better amps, etc as I have the funding. I'm just tired of having these awesome speakers sitting on milk crates in the basement as to not get wet. I want them functioning, even if its not to their full potential at least for now.
But I welcome advice as to how to make it superior so I have the knowledge when the money comes is as well as the most economical way to make them function for now.
OK, that helps. Here's your problem: If you want to use only 2 channels of amplification, you're looking at a passive crossover. Building one scratch-built to use the JBL horn/drivers will be heading for $200-300 the pair. Price out the JBL 3115 parts list at Parts Express to get an idea of what I'm talking about.
Since you've got the e-crossover already, why not just spring for a smaller amp to drive the horns via the e-crossover? At least you'll be able to sell it on Craigslist later if you choose another path or abandon the project. Why not snag a little 20wpc amp on CL, lash up the JBLs/crossover and be done with it for a while?
What do you have for low end drivers?
Just my thoughts......
Cheers,
David
Low end is JBL 4647, but I also don't have amp for those either, so I'd need to buy 2 amps. I was thinking Crown CE1000 for horns and CE2000 for woofers. But even on Ebay I'd have about $600 into those.
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