| Re: Project JBL [message #47055 is a reply to message #47048] |
Sat, 04 June 2005 14:04   |
Russellc
Messages: 397
Registered: May 2009
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Illuminati (1st Degree) |
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Yes, a single 2226 is fairly amazing, with two you should have lots of air moving. I look at the JBL 18 inchers, I will probably snag a pair of these some day and install them in the bottom of my A7s and seal off the lower reflex from the mid horn like several do on the Altec users forum. Of course this will require a 3 way crossover, electronic for my purposes. More complicated wiring, etc. Regards,
Russellc
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| Re: Project JBL - 2012 vs 2123 mid horn? [message #47056 is a reply to message #47053] |
Sat, 04 June 2005 14:41 |
swett
Messages: 47
Registered: May 2009
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Baron |
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Thanks, that makes sense. I couldn't find anyone selling the 2012 used, but if its the new model, that would make sense. I'm trying to do the same thing you are, though I did end up buying the 2226's used, not the 2225's. I bought the 2425's from Bill Martinelli and I found some used 2123's for a good price, so hopefully I'll be able to buy those as well. I couldn't afford or justify new JBL parts, and a perk of buying used is that you can use them for a while and could resell them for about what you bought them for. -Ian
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| Re: Project JBL - 2123 spec sheet [message #47062 is a reply to message #47059] |
Sat, 04 June 2005 17:57 |
swett
Messages: 47
Registered: May 2009
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Baron |
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Here's the 2123's spec sheet: http://www.jblpro.com/pub/obsolete/2123.pdf The frequency curve isn't exactly a measurement, but from comparing this with the 2012's, it does appear they both drop dramatically around 5k, so the 2123 is probably a good substitute, though JBL claims the 2012 is an improvement over the old driver. -Ian
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| Re: Project JBL - 2012 is better for horns.. [message #47098 is a reply to message #47053] |
Sat, 11 June 2005 16:57 |
swett
Messages: 47
Registered: May 2009
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Baron |
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I was looking around at both of these, and it appears that the 2012 is a better candidate for a midrange horn, because of its gradually rising response. The 2123 should be quite flat without a horn, so its probably best used as a direct radiator, and is not an exact substitute for the 2012. -Ian
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| Re: Project JBL - 2012 is better for horns.. [message #47100 is a reply to message #47098] |
Sun, 12 June 2005 12:52 |
Russellc
Messages: 397
Registered: May 2009
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Illuminati (1st Degree) |
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I just got it because it works fine, regardless of what graphs show. It was specified for the 7Pi Audiophile model, which in fact was a direct radiator. Mainly, I selected it because of the cost of the new jbl 2012. Wayne has assured me I couldn't tell the difference, which should be slight, and that the 2123 is an excellent choice. I don't know if jbl changed there measuring proceedures between the old and the new, but I notice slight differences between them, including the 2425 and the 2426, which people tell me are identicle. Again, there is certainly nothing wrong with either choice, and no sonic difference will be detected. slight differences such as these, while measureable in a sound chamber, will be dwarfed by room interaction. Myself, I'm not convinced a gradually rising response is a good thing, with non horn speakers it has been my experience it always complicates the crossover design. Even if it appears to better match the high freq. unit, Proper crossover should make it a non issue. Again, I also feel the differences between the drivers is so slight (except for price) it doesn't require adjustment. High efficiency speakers have a tendency to shout already. If money were no object, I would go with the new driver from Wayne. Email wayne for his thoughts. either jbl driver will be superior to the other eminence and so forth "stock" drivers, which truth be told probably would work just as successfully as either JBL.
I never found 2012 used, and the new price put it out of budget for me.
the 2123 is legendary and has been used in alls sorts of applications, from direct to horn most successfully. I'm sure you will be happy with 2012 as would I if I could afford the blasted thing!Regards,
Russellc
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| Re: Project JBL - 2012 is better for horns.. [message #47101 is a reply to message #47100] |
Sun, 12 June 2005 13:02 |
Russellc
Messages: 397
Registered: May 2009
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Illuminati (1st Degree) |
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You know, looking at Wayne's response above, he sounds like he is saying that the 2012 is the flatter one, and states that the 2123 has "more output above 2000" ? Whatever, once I get the cabinets I'll post if there are any crossover abnormalities at the crossover point to the compression driver. I'm sure other "budget concerned" individuals have wondered about this. I'm sur the 2012 will be spot on as it was the driver intended for this design. Russellc
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| I can't afford the 2012 either :) [message #47102 is a reply to message #47100] |
Sun, 12 June 2005 13:58 |
swett
Messages: 47
Registered: May 2009
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Baron |
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Everything I've read says the 2123 is a great driver and I'm still trying to get a pair, I just wanted to give you an FYI, about the slight differences between the two response curves. Close enough, but not identical. I'm still deciding on my midrange. If I can, I may just use a pair of 2123's in direct radiator mode. If I can't find any 2123's for a reasonable price, I'm considering Wayne's Delta midrange and Adrian Mack's Alpha midrange. I've never seen any 2012's used either. They are 10 years old now, so you'd think some people would have extra, but maybe people really like them? -Ian
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