2x6.5" drivers ?

[kartsmart]

what would be a good driver to cover the lower mid then cross over to a jbl 2420 horn drive.
I see plh, beyma,B&C, selenium, all seem to have a few choices, but witch one really works good ? that sweet spot !

[kartsmart]

earler in a post I was told that A tad 1602 15" driver would never cross over to a 1" jbl horn because a 15" driver moves to slow to blend in with a horn. ok thats easy enough to understand. so I was reading in a few post that a pair of high eff. 6.5 drivers would not work well because wierd things begin to happen . now that I dont under stand at all, 6.5s that are much faster, able to cross over higher, reproduce mids. so when Jbl back in the days of the horn loaded uppers and 15" drivers maybe 5" mid did not work? could some one set me straight so I can work the problem out of my project.
when using the DCX2496 cross over could some of the problems be worked out ? my set up is WTW , tad 1602,jbl 2420, tad 1602

[azrix]

Rise time is directly related to bandwidth. If your driver doesn't start rolling off before it's crossover point, you should be good. Crossing over before your driver starts rolling off, say an octave earlier, is generally a good idea for various reasons. The problem with using large drivers isn't rise time, but energy storage. It varies alot, but in general, the larger a driver is, the lower in frequency energy storage becomes an issue.

Unless accounted for, multiple drivers covering the same bandwidth are going to have polar response issues. That's where D'Appolito alignment came from, trying to fix the polar response issues. I would assume that was what was meant by "weird things begin to happen" was poor polar response.

The TAD 1602 goes up to 2kHz, which should be okay for about a 1Khz crossover. As long as you have a horn that goes that low, you should be fine, though that is about as low as most 1" compression drivers and horns will go. Do you have the TAD's already? If not, you might look at getting a TAD 10" for the mids and a TAD 15" or 18" for the bass. That should work well, if you were wanting to go with TAD drivers. Otherwise, there are many 10", 12", 15", and even a few 18" drivers that should work with that JBL. If you don't mind the space taken up, a 10" or 12" for the midbass with a 15" or 18" for the bass would be a good combination, IMO.

[kartsmart]

Yes I do have the TADs 4 of them 2 -2420s, 2 -2345s. so then a 8" or 10" mid will work better than 2- 6.5s , any ideas on a good proven driver. and thanks of your reply it seems Im not getting to many.

[azrix]

Just to clear something up, when I said 'TAD' earlier, I meant TAD/Pioneer, a manufacturer of drivers.

I'm not saying that a single driver is better than multiple drivers, just that it is generally easier to design when you only have one midrange driver.

Well, you had mentioned the TAD 1602 earlier, so if you went with that (or some other TAD) for a bass driver, any of the TAD 10" or 12" drivers should work. The JBL 2420 has an alnico magnet, right? TAD has an alnico 10", the 1102, if that's your thing.

I can't really make any other specific recommendation because there are so many drivers of this sort out there. Besides the brands you already listed, there is Eminence, BMS, Radian, and JBL who all make drivers that fit these sort of designs. Any of them that have the frequency response that you need will work. A lot of it depends on how much you're willing to spend and how important sesitivity is to you. I will say that TAD and PHL drivers seem to me to have the best reputation online of those listed. I'm also under the impression that B&C make some great drivers of this sort too, so you might look at them as well. If you don't mind what they cost, they would probably be what I'd look at. For TAD, any of the 10" or 12" drivers will work. For PHL, look at the Extended and Midrange series in any size you want. For B&C, I'd want to stick with Neodymium drivers because they're so much lighter, but any driver that has a listed frequency range a good bit higher than where you want your crossover point to be will be fine.

Personally, in this case, I'd probably go with a 10" mid driver and single or dual 18" or 15" bass drivers, similiar in design to this or this, but that's just me.

[kartsmart]

has anyone used the BEYMA 10MI100 - 10" MID-FREQUENCY SPEAKER to cover say 150 to 3k / if so how does it compare to the jbl 2212 or the 112

[Magnetar]

Hello

I have an extra couple of pair of JBL 2123J's (16 ohm) that will cover the 150-3k range well - about perfect for the 2420 JBL. I also have some nice mid horns to load a pair in if you are interested. Also have a pair of 2123H 8 ohm - sound/work fine but look a little beat. I'm in NE Ohio. Email me if interested.