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RE: JBL123-A/Klipsch 400 speaker build HELP

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In Reply to: RE: JBL123-A/Klipsch 400 speaker build HELP posted by djk on July 28, 2012 at 17:59:09

Hi djk, not 2 big 2 jail, ha ha, I like that, almost as funny as you're "little girl with guitar music" comment, unless you consider, Muddy Waters, Jimi Hendrix, Keith Richards, little girls? not that I am oppossed to said girls with guitars, in fact have you had the privilege of listening to Esperanza Spauling, I believe she could possibly be the best acoustic Jazz bassist on the planet, and I do still listen to Nora jones, from time to time. But yes, 30W is a bit skimpy, thats why I'm eying a Threshold S 200.
The JBL123-As are crossed over at around 6k, using a Urie 535 electronic xover. the Klipsch are crossed over using the Crites upgraded passive crossover,with sonic caps, and custom made cables, by sain line systems (recently reviewed in Stereophile mag. i'm not a techie type, so I can't get too technical. I did have the Klipsch 400s sandblasted, then all the voids were filled with bondo, then sanded. The inside was hand sanded to a very, very smooth finish(not repainted) and the exterior was spray painted to match the bare aluminum on the inside. they are well damped, and there is no "honk" that I or anyone of my hi fi buddies have commented on, but maybe the power amp dept could do with beefing up a little. but overall they are quite close to being "there" I will try to post some pics. Thanks for you helpful suggestions.

Follow Ups:

6k XO is awful high - badman 17:27:17 07/29/12 (5)
It's a lovely wideband driver but 6k is REALLY pushing it. And 100WPC should be requisite for them, though 50WRMS is what they're rated for (Unless it's a serious 50WPC).

You have a VERY narrow dispersion in the band key to imaging- 1k-6k, since it's laserbeam from the driver by 2k

I'd start with the crossover and go from there.

Bass is supposed to sound big. 6.5" is not a woofer size.
- RE: 6k XO is awful high - Cosmickat 22:02:10 07/29/12 (4)
  Hi badman, your probably right on both counts. The crossover point is easily remedied though, with the electronic xover, and I did start at the recomended 4k, but as you say the123A has a lot of sweet music in the 4.5-6k range, and I'm thinking 100w per channel at least for more bass. Do you happen to know min/max cabinet size for this driver? I've heard 3 cubic ft in a sealed box is a winner, but I have around 5 cu ft...is the cab too big for this driver, and is this the main reason of not enough bass?
  - You'll get the impression of "More" in 3cu ft - badman 09:15:36 07/30/12 (1)
    Which you can do just by loading some bricks into the existing cabinet. You'll have more midbass at the expense of the deepest stuff- which is probably a good tradeoff.
    
    Bass is supposed to sound big. 6.5" is not a woofer size.
    - RE: You'll get the impression of "More" in 3cu ft - Cosmickat 12:17:33 08/01/12 (0)
      badman, thanks I will spend some google time looking into ALL this GOOD STUFF!
      
      Cheers,
      
      Cosmickcat
  - RE: 6k XO is awful high - Cosmickat 08:43:38 07/30/12 (1)
    Hi badman, just to clarify, The 123-As are going through the Urie 535 electronic xover at around 450-600Hz NOT 6000K sorry my mistake.
    - Ah, that's a better point - badman 09:09:47 07/30/12 (0)
      But now you're too low- asking too much from the horn on the bottom end most likely, and you'll get a better directivity match around 1200Hz or so.
      
      Take a little google time with "econowave" and you'll see some utilization of the 123a in 2 way horn systems, and some idea of directivity matching.
      
      Bass is supposed to sound big. 6.5" is not a woofer size.

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