In Reply to: RE: JBL123-A/Klipsch 400 speaker build HELP posted by Cosmickat on July 30, 2012 at 08:58:52:
Even if "textbook" filters can get a lucky newbie "close"... you have zero baffle step compensation for these. Push them up against the wall (if they are not already) and you might find the bass situation improves.
Is your box ported or sealed? Did you use any T/S parameters to come up with this box size?
http://www.jblproservice.com/pdf/Thiele%20Small%20Parameters/Theile%20Parameters.pdf
That's where you can see the 123A T/S parameters for your speakers there. Of course, your drivers could have slightly different T/S parameters - although JBL is likely going to have decent drive-unit consistency.
Adding volume to a box is not that hard - add a chamber on the back or bottom. Reducing volume is also easy - fill the cabinet with a sealed internal void. It can be a square box made of wood - or even a fire log if you're on a budget.
When you're building a crossover for a PA woofer coupled with horns, you absolutely NEED to measure. Factory "specs" and factory response curves will not get you too far.
Cheers,
Presto
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Follow Ups
- RE: JBL123-A/Klipsch 400 speaker build HELP - Presto 13:32:57 07/30/12 (6)
- RE: JBL123-A/Klipsch 400 speaker build HELP - Cosmickat 11:23:31 07/31/12 (3)
- RE: JBL123-A/Klipsch 400 speaker build HELP - Presto 22:15:10 07/31/12 (2)
- RE: JBL123-A/Klipsch 400 speaker build HELP - Cosmickat 10:18:18 08/01/12 (1)
- If you want to get this really singing - badman 14:59:33 08/01/12 (0)
- RE: JBL123-A/Klipsch 400 speaker build HELP - Cosmickat 19:17:16 07/30/12 (0)
- re: "although JBL is likely going to have decent drive-unit consistency" - badman 14:37:03 07/30/12 (0)