eminence beta 15

phenomen · 8th December 2009, 11:51 PM

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 !!!!!!

chris661 · 9th December 2009, 06:21 AM

Someone here used it for OB, might be worth a look around, send a message...

jbell · 9th December 2009, 01:13 PM

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....

wg_ski · 9th December 2009, 01:38 PM

Quote:

Originally Posted by jbell

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).

c2cthomas · 9th December 2009, 01:59 PM

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.

Yunick · 9th December 2009, 03:07 PM

Here you go :-)

All Eminence OB

phenomen · 9th December 2009, 10:39 PM

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

Cal Weldon · 10th December 2009, 12:36 AM

Moved to Multi-way

PeteMcK · 10th December 2009, 04:13 AM

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

wg_ski · 10th December 2009, 04:52 AM

Quote:

Originally Posted by phenomen

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.

8th December 2009, 11:51 PM	#1
phenomen diyAudio Member Join Date: Nov 2009	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 !!!!!!

9th December 2009, 06:21 AM	#2
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	Someone here used it for OB, might be worth a look around, send a message... __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

9th December 2009, 01:59 PM	#5
c2cthomas 49 - for the 16th time diyAudio Member Join Date: Oct 2006 Location: Near "Music City" (Nashville Tennessee)	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. __________________ "You can't always get what you want" K. Richards/M. Jagger *** "Next time I will know some things better" Zen Mod

9th December 2009, 03:07 PM	#6
Yunick diyAudio Member Join Date: Mar 2006 Location: Timrå	Here you go :-) All Eminence OB __________________ http://www.blogotheque.net/-Concerts-a-emporter-

10th December 2009, 12:36 AM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Moved to Multi-way __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting


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9th December 2009, 01:13 PM	#3
jbell diyAudio Member Join Date: Apr 2003 Location: .	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....

9th December 2009, 10:39 PM	#7
phenomen diyAudio Member Join Date: Nov 2009	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

10th December 2009, 04:13 AM	#9
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	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 __________________ ‘today… there lives alongside the twentieth century the tenth or thirteenth. A hundred million people use electricity and still believe in the magic power of signs and exorcisms” Trotsky

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