To the JBL pro guys...... - Page 2 - AVS Forum
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post #31 of 43 Old 08-06-2011, 09:42 AM
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Quote:
Originally Posted by FOH View Post

I agree with one of the above posters, the value is extraordinary of any of these for HT. From a 4722, to an offering from the AE series, to the big Screen Array stuff. I'm no JBL fanboy, but they've done so much R&D that the entire industry benefits from. These designs offer so much performance for the money, it's incredible. Low distortion, high output, pattern control.....so many people would be better served going down this road as apposed to a significant amount of other marginal struff out there for HT.



Nice trip down memory lane there with MK's stuff. I forgot about those big 3 ways of his.

Thanks

I agree. If you have the space, waf and/or AT screen to make the JBL cinema speakers feasible, it is a great option. The 4722N is probably the best option as it is ready to rock out of the box. There isn't even a need for external amps. Nearly any receiver will power these just fine.

The bigger stuff is more complex and the situation has to be right to make use of them.

JBL, due to their massive R&D and production capability are able to dominate the commercial theater market. It is hard to beat their performance for the money. To think that the retail price on their highest end speaker is only ~$5000 and that is good enough for the Academy Awards, that says quite a bit.

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Originally Posted by Scott Simonian View Post

Yes. A quad, very tightly packed cube directly underneath the 2380. The C-C will be WAY closer than anything that JBL builds, themselves. This is kind of a proof of concept build so it's definitely NOT going to be perfect project/speaker system and I do not intend it to be... for the most part anyway. Looks like I will be using the DCX for the crossover and that supports 48dB/oct filters if I indeed need that steep a slope. I've got a lot of options.

No, haven't bought the Beyma's yet. Still shopping around but all the stuff that I'm interested in is too expensive. I do know that I want the 2445/2380 combo to operate as wide as possible. That means I'll cross the sealed quad 15's at ~600hz, let the 2445 operate up to the end of the midrange/bottom treble. That is not going to change, not until I can listen to the system, myself.

I'm sure the JBL AM's are awesomely great speakers but this is what I plan to build. It may suck though so I'll definitely need some help fixing it if it sucks ass. Heh.

Be careful with the 48db filters. They can introduce some weirdness, although I haven't used them with the DCX. If the nulls are about 20deg apart like they probably would be with the Beyma on to of the 2380, a 24db/oct crossover will probably give you a 10deg window where it is pretty flat. A 48db would probably give you 13-15deg. Obviously this is the acoustic slope, not the electronic. If the Beyma is falling at 12db/oct a 24db/oct setting on the DCX will give you about 11-12deg. IMO, that is pretty tight, but you might be fine with a pretty narrow vert window.

Is there a reason why you want to use the 2445 over the widest range possible? Although the ring radiators like the 2414H is a cheaper driver, I'd bet it will sound better in a home environment over the 2khz to 6khz range than the 2445. It should also be better than the Beyma over the 5khz+ range. It is simply newer and better technology. The only disadvantage it has is lower power handling and ultimate SPL, two things that don't matter to you.

Even if you want to run the 2445 up as high as possible, the Ewave WG+2414 crossed at 4khz will give you the same vertical nulls as the Beyma at 5khz.

I just don't see any reason to run the Beyma. The Ewave+2414 will even give you a range that you can try 2khz - 4khz to see which you prefer. With the Beyma you are pretty much stuck with a steep slope at 5khz. The Beyma can't play lower than that and any higher cross will mean nulls on axis.
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post #32 of 43 Old 08-06-2011, 03:05 PM
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I've been researching cinema speaker design for over a year, specifically looking at JBL's designs. Although I am not meaning to copy any specific design of theirs. It is something I see in some speaker systems. I like the idea of having a single source for the midrange or at least most of it. I want to try that myself and since I own the 2445's and no other Mid/HF components, I want to give it a shot. I haven't heard it yet in my own HT room to know if it will or will not sound bad. I guess I'd like to hear it for myself. My main concerns for this system are dynamics and clarity. It's a rather small room with a very small listening window.

The Beyma isn't my first choice for the HF but it was affordable and it was just the right driver for my specific needs. Not only that but on the older speakers systems that were built like what I'm doing they would be used just the same. It's all an experiment for me but I had my ideas for a design and have most of the components for it. It's taken way longer than I imagined it would to get together and now I'm not looking for any reasons to extend the wait. I'll looking to install now and I don't mind nixing the 5khz and up to do it.

Thank you very much for your contribution and I truly will take your advice but I think I will try it my way with the parts I have and listen to them first and then go from there.

It should be fun for everyone.

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post #33 of 43 Old 08-06-2011, 07:51 PM
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That's cool. I hear what you are saying on the midrange. I'm sure you will be able to get it to play very nicely. If you ever get the itch to throw $80-90 at it, give the Ewave + 2414 (or other 1" JBL CD) a try to compare. I definitely look forward to seeing the results of your ambitious project.
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post #34 of 43 Old 07-20-2012, 03:37 PM
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Rather than start a new thread, I'll revive this one since its on topic.

What are the best sounding JBL compression drivers in the $100-300 range each? Mktheater seems to like the 2432. There are so many models with little differentiation.
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post #35 of 43 Old 07-20-2012, 03:45 PM
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What size throat?
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post #36 of 43 Old 07-20-2012, 06:46 PM
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"What are the best sounding JBL compression drivers in the $100-300 range each?"

beyma cp380m. hey, the company was started by former jbl guys iirc, so doesn't that count? :-)

http://profesional.beyma.com/ingles/pdf/CP380M.pdf

frequency response and harmonic distortion are very, very good.

Listen. It's All Good.
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post #37 of 43 Old 07-20-2012, 07:03 PM
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I'll ditto the CP380M. I used them for about a decade, until I loaned my pair to someone who disappeared with them.
B&C DE250 is very good too, and about 1/3 the price of the Beyma.
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post #38 of 43 Old 07-21-2012, 03:32 AM
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Quote:
Originally Posted by Jesse S View Post

Rather than start a new thread, I'll revive this one since its on topic.
What are the best sounding JBL compression drivers in the $100-300 range each? Mktheater seems to like the 2432. There are so many models with little differentiation.

Hi,
The 2432H is not a $300 driver, but it can be had in a bundle with the proper waveguide, mounting brackets, and passive crossover as the 4722N-HF. If you want it without the crossover it's sold as the 4722-HF.

Regards,
Dan
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post #39 of 43 Old 07-21-2012, 06:58 AM
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Quote:
Originally Posted by NEO Dan View Post

Hi,
The 2432H is not a $300 driver, but it can be had in a bundle with the proper waveguide, mounting brackets, and passive crossover as the 4722N-HF. If you want it without the crossover it's sold as the 4722-HF.

It is possible to get the 2432's for ~$500 a pair on Ebay.

From what I can find,

B&C ~$120
Beyma cp380 ~$190
JBL 2432 ~$200-250
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post #40 of 43 Old 07-21-2012, 04:45 PM
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I actually prefer the aluminum diaphragms over the Ti. The 2430 and 2431 are Al.
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post #41 of 43 Old 07-21-2012, 06:04 PM
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$500 would be a reasonable deal for a pair in good working order. You should realize there is a difference between EconoWave and Megawave...

fc80f78c.jpg

Regards,
Dan
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post #42 of 43 Old 07-21-2012, 06:21 PM
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Quote:
Originally Posted by Wrager View Post

I actually prefer the aluminum diaphragms over the Ti. The 2430 and 2431 are Al.
It's interesting that the Al diaphragm replacements are ~$50 more than the Ti. It's too bad they never got away from the metal suspension to something like B&C does with their nicer units:

Regards,
Dan
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post #43 of 43 Old 05-07-2013, 10:57 PM
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Quote:
Originally posted by coctostan

It might be counterintuitive, but the dual mid-woofer options probably work better at closer distances than the single mid 3730............

Yes I know this is an old thread but if you're around coctostan, I'd be interested to know why this would be.....just curious.
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