Which helper woofer in open baffle would you pick? - diyAudio
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Old 16th December 2010, 02:54 AM   #1
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Default Which helper woofer in open baffle would you pick?

I'd like to use a helper woofer with my Tang Band 1808 in a low, wide open baffle design. I've been looking at these two, partly because of the price and the high Qts: the GRS 12FP-8, and the Eminence Alpha 12A. I plan to crossover to the Tang Band at around 200 Hz using an active crossover. One downside to the GRS is the lower sensitivity - since I'll be using an active crossover its not as big an issue, but I'd like the option of later building a passive crossover to allow use of just one amp if desired, and the GRS would probably disappear in that event. I've about settled on the Alpha. Any other reasonably priced contenders I should consider, and do you agree that I should go with the Alpha?
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Old 16th December 2010, 02:59 AM   #2
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The more I look at the GRS I realize I shouldn't have even bothered including it for consideration. Any other contenders for a 12" helper woofer below about $100 I should consider? I'm using a repurposed Wharfedale SFB baffle that I don't want to modify, so it has to be a 12".
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Old 16th December 2010, 04:49 AM   #3
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Originally Posted by Racket Scientist View Post
The more I look at the GRS I realize I shouldn't have even bothered including it for consideration. Any other contenders for a 12" helper woofer below about $100 I should consider? I'm using a repurposed Wharfedale SFB baffle that I don't want to modify, so it has to be a 12".
maybe Fane have a suitable driver?
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Old 16th December 2010, 06:22 AM   #4
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Historically, one acoustically fit the driver to the baffle, i.e. matched the driver's mass corner (2*Fs/Qts) to the baffle's effective width with a Fs ~a half octave below the baffle cut-off, though nowadays EQ is used to shape its response, so whatever driver is within budget that has a low enough Fs for the baffle size + any boundary loading and high enough Xmax/power handling and/or high Qt (up to ~1.5 depending on the desired mass corner) to meet the SPL desired.

Easiest to just try different drivers in Basta!, MJK's MathCad OB worksheet or similar.

GM
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Old 17th December 2010, 12:22 AM   #5
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Alpha.
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Old 17th December 2010, 09:57 AM   #6
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Originally Posted by GM View Post
Historically, one acoustically fit the driver to the baffle, i.e. matched the driver's mass corner (2*Fs/Qts) to the baffle's effective width with a Fs ~a half octave below the baffle cut-off, though nowadays EQ is used to shape its response, so whatever driver is within budget that has a low enough Fs for the baffle size + any boundary loading and high enough Xmax/power handling and/or high Qt (up to ~1.5 depending on the desired mass corner) to meet the SPL desired.

Easiest to just try different drivers in Basta!, MJK's MathCad OB worksheet or similar.

GM
Thank you! I must say, that is a well crafted explanation. A taut construction of intuition and engineering terms complementing each other; left-right-left-right-knockout.
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Old 17th December 2010, 04:56 PM   #7
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The Beta is really the better driver.

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Old 17th December 2010, 06:09 PM   #8
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Originally Posted by kristleifur View Post
Thank you! I must say, that is a well crafted explanation. A taut construction of intuition and engineering terms complementing each other; left-right-left-right-knockout.
Heh - SWMBO is watching Sherlock Holmes at the moment - the fight scene just played out.
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Old 17th December 2010, 07:44 PM   #9
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Some people really like the Tone Tubby 12". Here's some info, but it looks like it's used here less as a helper woofer than a fullrange candidate. The 12" Alnico Tone Tubby
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Old 17th December 2010, 08:02 PM   #10
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I accidentally recently ordered some Alpha 12's instead of the Beta12A2s. Because it will cost me 15 bucks to send back a pair of the Alphas I tried really hard to fit them into any project I could conceivable start.

They're in the box and going back. They're really about half a speaker, and for another 10 bucks you can get a real one. I'd suggest to figure out an electronic/electrical way to control the Q for the OB application and use a Beta.

I don't know what your amp situation is like but the Alpha 12A is probably only quite reasonable down to 50Hz OB if you have less than 15 watts to work with or something.

Last edited by Andrew Eckhardt; 17th December 2010 at 08:13 PM.
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