Open baffle issues???

Uhills · 9th January 2012, 06:49 PM

I'm considering an open baffle project and am trying to sort out a few things. I've read numerous accounts of active equalization vs passive, complications with matching the levels of the mids/tweets and the woofers, baffle width, quarter waves, dipole null, etc, etc.....

I'm considering a 'beginner' project. I'd like to start by taking the drivers from a pair of JBL HLS-610 or boston vr-940 and mounting them on a baffle (probably 20"w x 38"h) and then I'd like to blend them in with an Eminence Alpha 15. I intend to Bi-amp.

Has anyone tried this? I can't easily find the T-S parameters of the 'donor' drivers, so i'm really taking a shot in the dark. I know the baffle widths of the donor cabinets are much less than 20" and I'm guessing the donor crossovers are simple 12db/octave crossovers. What are the major problems with this approach?

Kjeldsen · 07:44 PM

You need to be able to measure anyway, so no problems at all. It don't have to be expensive. This is a full calibrated system for 148 €
http://www.kirchner-elektronik.de/gb-atb-pc-pro.php
- I think you have to multply with 1,3 to have it in USD but no quite sure.

Or you can download Holm Impulse for free
HOLM Acoustics

And use a cheap selfmad mic based on panasonic WM61 capsule
Home Theater - Image Gallery - Panasonic Microphone wand

Then you are ready for less than 20 USD.

picowallspeaker · 9th January 2012, 07:51 PM

OB produces a dipole in ambient emission ( sound propagation ).
So that's , I think , the main feature .
The back wave of the speaker / system is not controlled / attenuated by the cabinet ,but by the room .

9th January 2012, 06:49 PM	#1
Uhills diyAudio Member Join Date: Dec 2009	Open baffle issues??? I'm considering an open baffle project and am trying to sort out a few things. I've read numerous accounts of active equalization vs passive, complications with matching the levels of the mids/tweets and the woofers, baffle width, quarter waves, dipole null, etc, etc..... I'm considering a 'beginner' project. I'd like to start by taking the drivers from a pair of JBL HLS-610 or boston vr-940 and mounting them on a baffle (probably 20"w x 38"h) and then I'd like to blend them in with an Eminence Alpha 15. I intend to Bi-amp. Has anyone tried this? I can't easily find the T-S parameters of the 'donor' drivers, so i'm really taking a shot in the dark. I know the baffle widths of the donor cabinets are much less than 20" and I'm guessing the donor crossovers are simple 12db/octave crossovers. What are the major problems with this approach?

9th January 2012, 07:41 PM	#2
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	You need to be able to measure anyway, so no problems at all. It don't have to be expensive. This is a full calibrated system for 148 € http://www.kirchner-elektronik.de/gb-atb-pc-pro.php - I think you have to multply with 1,3 to have it in USD but no quite sure. Or you can download Holm Impulse for free HOLM Acoustics And use a cheap selfmad mic based on panasonic WM61 capsule Home Theater - Image Gallery - Panasonic Microphone wand Then you are ready for less than 20 USD. Last edited by Kjeldsen; 9th January 2012 at 07:44 PM.

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9th January 2012, 07:51 PM	#3
picowallspeaker diyAudio Member Join Date: Apr 2007	OB produces a dipole in ambient emission ( sound propagation ). So that's , I think , the main feature . The back wave of the speaker / system is not controlled / attenuated by the cabinet ,but by the room .

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