Woofers appropiate for Open Baffle projects - diyAudio
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Old 8th April 2014, 01:22 AM   #1
juliopr is offline juliopr  Puerto Rico
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Default Woofers appropiate for Open Baffle projects

I have been searching for alternative woofers to the Eminence Alpha 15A for open baffle project.. I have seen a few 15" and 12" units from Goldwood and GRS that seem to have the appropiate Qts rating (over 1.0) and frequency response specs that could make them ideal for Open baffle application and the potential to go lower on frequency response (starting from 22Hz-25Hz). I will really appreciate if anyone can explain to me if I am wrong or tell me if I am not so far from the right path.
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Old 8th April 2014, 07:25 AM   #2
OllBoll is offline OllBoll  Sweden
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You can use almost any woofer, high Q woofers are useful if you don't use EQ while you can use low Q woofers if you have it. The only required parameters high excursion with low distortion.

If I remember correctly Linkwitz uses low Q woofers because he can apply simple EQ to get the frequency and phase response he wants. Others use high Q as they want a passive speaker. The Alpha is used in passive speakers but it's not that ideal as it has a very low xmax. If you want a good high Q woofer then there are much better options but that depends on how much air you want to be able to push in the bass. AE IB15 for example is awesome if you want a high Q woofer with massive excursion capability.

Last edited by OllBoll; 8th April 2014 at 07:30 AM.
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Old 8th April 2014, 10:26 PM   #3
juliopr is offline juliopr  Puerto Rico
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Thanks for your response... I have looked into these IB15... but... is there a less expenive alternative?
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Old 8th April 2014, 10:49 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

The Goldwood and GRS drivers are suitable for open baffle.
Personally I like the the GRS drivers more than the GWs.

Though 22Hz to 25Hz is simply not a practical number for OB.
And your looking at very low sensitivity with one OB driver.

http://www.quarter-wave.com/OBs/OB_Design.pdf

rgds, sreten.
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Old 9th April 2014, 02:09 AM   #5
juliopr is offline juliopr  Puerto Rico
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Quote:
Originally Posted by sreten View Post
Hi,

The Goldwood and GRS drivers are suitable for open baffle.
Personally I like the the GRS drivers more than the GWs.

Though 22Hz to 25Hz is simply not a practical number for OB.
And your looking at very low sensitivity with one OB driver.

http://www.quarter-wave.com/OBs/OB_Design.pdf

rgds, sreten.
Thanks for your response. I plan to use at least 3 or 4 of these drivers per channel to almost match the height of the RD 48 or maybe the RD 75... but since I already have 4 eminence Alpha 15"s and their FR is from 40Hz, I would like to use woofers that can reproduce lower bass notes even when the open baffle factor might affect the low end... and if I combine them in parallel, maybe It will help in the acoustical/ electrical efficiency department. What do You think?
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Old 9th April 2014, 07:16 AM   #6
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8 - 400 Hz: infraplanar
10 - 110 Hz: infraplanar
20 - 200 Hz: infraplanar

Others

20 Hz and up:
SPHYNX SP-W15-BP - Price 2x drivers: 64,90
SPHYNX SP-W15-BP Lot de 2 boomers Hifi 300 W / 38 cm

24 Hz and up:
Pyle PPA15 15" PA Speaker - Your Price $49.88
http://www.parts-express.com/pyle-pp...eaker--292-218
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