2426 horn loading questions @ Altec 511 B, 2370 comparisons

Hi Guys!
How low can we really take this 2426/2370 horn combo? The JBL literature shows loading down to 500 hz. with a 630 hz. minumum crossover(20 watt maximum cont.) At 20 watts we're close to 130 db, so shouldn't be a factor. Want to mate with a pair of 2226 J woofers per channel. I assume that 12 db low pass, 18 db high pass with Wayne's rc network would be the best implementation? Are there programs available to determine proper crossover components by simply plugging the numbers? Also, anyone used the JBL 2426 with the Altec 511 B horn? Any comparisons? Would the rc network still be appropriate? Thanks to all! Jerrod

Follow Ups:

Re: 2426 horn loading questions @ Altec 511 B, 2370 comparisons - Wayne Parham 15:41:48 03/10/02 (9)
- well damped 511's - Sam P. 13:09:15 03/11/02 (8)
  - Re: well damped 511's (and structural mods) - Wayne Parham 21:43:08 03/11/02 (7)
    - After all those mods you wind up with .... - ::mikeo:: 09:35:31 03/12/02 (5)
      - here it is - ::mikeo:: 10:19:40 03/12/02 (4)
        
        ask anyone with a fake rolex - Sam P. 10:59:40 03/12/02 (3)
        
        All I was trying to point out was... - ::mikeo:: 11:16:03 03/12/02 (2)
        
        I understand the profile looks similar - Sam P. 11:38:32 03/12/02 (1)
        
        Reminds me of "The Joker" - ::mikeo:: 11:54:24 03/12/02 (0)
    - further mods...2035 update - Sam P. 08:46:29 03/12/02 (0)