Posted by Wayne Parham [ 71.153.185.72 ] on May 02, 2009 at 12:40:46:
In Reply to: Converting 3 Pi to 4 Pi posted by Champion on May 02, 2009 at 07:02:37:
Replacing the front baffle would probably be the best way to do it, actually. Use a port with the same area (6.25" x 3.5") as the four π, but make it a 1.5" shorter to tune the Helmholtz frequency to 38Hz (8.5" long). The JBL 2226 will sound very nice in this cabinet, virtually identical with the stock four π design.
Note - If you mount the tweeter outboard, move the woofer all the way up to the top of the box. The woofer and tweeter should be as close together vertically as possible. Are you using a wood horn?
About the TD12S, I ordered a pair a week or two ago, so I expect them to arrive any day now. I'll evaluate it in the three π cabinet and make any crossover changes necessary to optimize. if it works out, I'll add it as an upgrade option for that model and for the six π cornerhorn.
I am hopeful the TD12S works out, giving the three π and six π models an upgrade path similar to the JBL 2226 in the four π and seven π models.
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