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In Reply to: Re: Another OB experiment posted by chopper87@aol.com on March 12, 2007 at 17:52:32:
Hi Lance,You are welcome.
You said the OB woofers sound bass heavy. Could you tell me how you matched the level of the woofers to that of the Lowthers?
Hopefully it is just a room mode issue, and response scans using test tones with different speaker locations should be able to reveal the nature of the problem.
Good luck with solving the bass issue.
Best,
Follow Ups:
FWIW, I use this 15" infinate baffle from Partsexpress: http://www.partsexpress.com/pe/pshowdetl.cfm?&Partnumber=295-455
I put it on an 18" wide baffle with 6" wings, same baffle my main speaker is mounted on (an EV SP-12B). The crossover is a line level set to 30hz, that goes into a seperate power amp. Given the response of the IB speaker, and the low crossover, it has no problem reaching up to the 150hz or so where the SP-12b falls off, and it give a pretty flat in room response to 30 or 34hz. Sounds great, integrates easily.
Hi Steve,I assume that the crossover at 30Hz is a first-order low-pass, and the idea is to use the 6db/oct slope to counteract the dipole roll-off to flatten the bass up to the onset of the dipole roll-off. Correct?
Best,
Works great.
'
See Kurt's note above - he's right on. 1st order low.
Kurt,
It do get triky, Don't it. Ya finds that purrrfect spot for the oft hard to please Lowthers. I mean a spot in the room on as simple an open baffle as one could imagine that seems to infuse every molecule of air in the room with life and light, then I gotta go and mess the whole thing up by changin things.Maybe I should have started out wth 8" woofers and titrated up to the right fit, minus obvious room mode excitement? I get a big kick out of your card board trial baffles (smart and cheap).
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