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Old 8th December 2009, 11:51 PM   #1
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Default eminence beta 15

Hi all,

i want to build a 3 way speakers with beta 15a(bass),alpha6a(midrage) and apt80(tw) all from eminence.

what is the best Vb and Fb for Beta 15 a in this application?? the crossover is at 280hz 12db/oct


thanks in advace !!!!!!
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Old 9th December 2009, 06:21 AM   #2
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Someone here used it for OB, might be worth a look around, send a message...
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Old 9th December 2009, 01:13 PM   #3
jbell is offline jbell  United States
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I think looking at eminence's recommended cabinets would be at least a place to start.
http://www.parts-express.com/pdf/290-410c.pdf

However, none of them look particularly impressive. I would be tempted to just run sealed, with a separate sub-enclosure for your alpha 8.

My 2c -- a 2way with the beta 12a-II beats your 3way, and is cheaper/easier....
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Old 9th December 2009, 01:38 PM   #4
wg_ski is offline wg_ski  United States
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Quote:
Originally Posted by jbell View Post
However, none of them look particularly impressive.
For a conventional 15" 3-way, the Delta Pro 15 would be the lowest end of the food chain worth looking at. I'd recommend one of the Kappa series (the basic steel frame model is fine). If cost is the issue use a 12" - a better 12 will go just as low/loud. Delta 12LF beats Beta 15 in everything except OB designs (the 15 is intended for lowish-power open back instrument cabs).
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Old 9th December 2009, 01:59 PM   #5
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I believe that Papa Pass likes this woofer in his OB's - take a look at the Burning Amp thread. Nelson is a friendly guy and I'm sure he would give you some clues.

BTW - sounds like a nice project - keep us posted on your progress.
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Old 9th December 2009, 03:07 PM   #6
Yunick is offline Yunick  Sweden
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Here you go :-)

All Eminence OB
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Old 9th December 2009, 10:39 PM   #7
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Thanks for feedback !!!

jbell : i know eminence recomended cabinets but at large vented cab
they say Vb=6 cu.ft for 100W ,
i dont know if its a realistic simulation with eminence designer.

wg_ski : yes Delta 12LF is better but now i have those 2 beta 15 a and i must finish with them

c2cthomas : Ok. i will post pictures too

Yunick : cool


the crossovers are :
bass 280hz 12db/oct
med 700hz 6db/oct and 2,8Khz 6db/oct
tw 7,2Khz 18db/oct

what do you think?

after i will know the best Vb i will start to build them
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Old 10th December 2009, 12:36 AM   #8
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Old 10th December 2009, 04:13 AM   #9
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re:'i dont know if its a realistic simulation with eminence designer.' - no, Unibox recommends 1138 Litres - 40 cu.ft......
OB or sealed with eq seem to be the realistic options
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Old 10th December 2009, 04:52 AM   #10
wg_ski is offline wg_ski  United States
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Originally Posted by phenomen View Post
after i will know the best Vb i will start to build them
As large of a sealed box as you can stand. Venting won't help.
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