15" woofer for OB?

grantnsw · 11th July 2009, 03:16 PM

Hi,
will this one be ok for OB? Fs is too high? comments please. Is it an Eminence Beta15 beater? thanks for your reply. cheers, Grant

Cal Weldon · 11th July 2009, 03:56 PM

Should be ok. You might need to eq it a bit with a q of less than 1.

longdrive55 · 11th July 2009, 07:03 PM

Eminence Alpha is better for OB, but the specs aren't too bad. Just don't expect much output below FS unless you room provides some gain for those frequencies.

Dr.EM · 11th July 2009, 07:15 PM

Xmax would be useful to know too; if it's higher, more EQ can be used potentially.

grantnsw · 12th July 2009, 12:19 PM

Great!...It will work. many thanks,

It comes down to an equal price decision between this and an
Eminence BETA 15 which would you choose please? (both available here)
This ones SPL response looks a lot smoother, if it was tested accurately.
Its supposed to be a bass guitar instrumental woofer.

I've read varying opinions here about optimal Qts for OB.
Is it true that high values give 'slow' bass and low values give 'tight'
bass with 'slam'? Some say around 0.7 to 1 is best, hence my Q.

re Qms, from wikipedia: "High Qms indicates lower mechanical losses,
and low Qms indicates higher. The main effect of Qms is on
the impedance of the driver, with high Qms drivers displaying a
higher impedance peak."

This one's Qms is lower than the Alpha/Beta15 and Selenium 15PW3.
So I'm wondering if (one of) the consequence(s) is poorer efficiency?

Guessing Xmax is 3-4mm?
oops, too many questions! thanks again, Grant

Pano · 12th July 2009, 12:38 PM

My guess is that it will be a lot like the Selenium 15PW3 once on a baffle. I used the Selenium 15PW3 for OB and liked them.

A smooth top end does help make the crossover easier and the Selem was nice in that respect. Have not heard the Beta 15. But both the Beta8 and the Beta12 LTA make excellent midrange drivers. Far better then their price or appearnce would indicate.

grantnsw · 12th July 2009, 01:22 PM

Thanks Pano,

You get around man! Moved from your Kihei paradise?

The Selenium SPL plot looks good, but its too costly to import,
( 3mm Xmax? )

Eminence drivers seem to have great credibility. The other driver I mentioned could be dodgy in that its graph looks a bit suss, ie no Z. So I wonder how accurate its T/S params are.

Yeah, Tinitus likes the Beta-8 as a mid, its smooth, but I want to cross to a FR, something like the new TBand W8-1808, but thats very expensive and unavailable as yet.

chris661 · 12th July 2009, 01:48 PM

Although I haven't tested this, I would expect bass guitar drivers to be below par for transients compared to a standard subwoofer driver.

Apart from that, the Eminence Alpha 15A has made a lot of OB fans very happy.

PeteMcK · 13th July 2009, 12:05 AM

Grant, I've got a pair of 12" Jaycars I've no further use for if you want them, these:
I couldn't bear to throw them away...

I'm running out of room... can drop them off next week(school hols) if you're interested, whereabouts in Sydney are you?

Moondog55 · 13th July 2009, 12:42 AM

Grant that's an offer you can't refuse.

Don't worry about the poor power handling, most of the time we listen at around a watt anyway.

You can always load the rear of the driver with a cheap poly doona from K-Mart
Ted

11th July 2009, 03:56 PM	#2
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Should be ok. You might need to eq it a bit with a q of less than 1. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

11th July 2009, 07:15 PM	#4
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	Xmax would be useful to know too; if it's higher, more EQ can be used potentially. __________________ My music page 3-Way system build thread

12th July 2009, 12:38 PM	#6
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	My guess is that it will be a lot like the Selenium 15PW3 once on a baffle. I used the Selenium 15PW3 for OB and liked them. A smooth top end does help make the crossover easier and the Selem was nice in that respect. Have not heard the Beta 15. But both the Beta8 and the Beta12 LTA make excellent midrange drivers. Far better then their price or appearnce would indicate. __________________ Take the Speaker Voltage Test!

12th July 2009, 01:48 PM	#8
chris661 diyAudio Member Join Date: Feb 2008 Location: Lancashire Blog Entries: 7	Although I haven't tested this, I would expect bass guitar drivers to be below par for transients compared to a standard subwoofer driver. Apart from that, the Eminence Alpha 15A has made a lot of OB fans very happy. __________________ "Throwing parts at a failure is like throwing sponges at a rainstorm." - Enzo My setup: http://www.diyaudio.com/forums/multi...tang-band.html

13th July 2009, 12:05 AM	#9
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Sydney	Grant, I've got a pair of 12" Jaycars I've no further use for if you want them, these: I couldn't bear to throw them away... I'm running out of room... can drop them off next week(school hols) if you're interested, whereabouts in Sydney are you? __________________ ‘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


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

11th July 2009, 07:03 PM	#3
longdrive55 diyAudio Member Join Date: Nov 2002 Location: Northern California-Bay Area	Eminence Alpha is better for OB, but the specs aren't too bad. Just don't expect much output below FS unless you room provides some gain for those frequencies.

12th July 2009, 12:19 PM	#5
grantnsw diyAudio Member Join Date: Aug 2006	Great!...It will work. many thanks, It comes down to an equal price decision between this and an Eminence BETA 15 which would you choose please? (both available here) This ones SPL response looks a lot smoother, if it was tested accurately. Its supposed to be a bass guitar instrumental woofer. I've read varying opinions here about optimal Qts for OB. Is it true that high values give 'slow' bass and low values give 'tight' bass with 'slam'? Some say around 0.7 to 1 is best, hence my Q. re Qms, from wikipedia: "High Qms indicates lower mechanical losses, and low Qms indicates higher. The main effect of Qms is on the impedance of the driver, with high Qms drivers displaying a higher impedance peak." This one's Qms is lower than the Alpha/Beta15 and Selenium 15PW3. So I'm wondering if (one of) the consequence(s) is poorer efficiency? Guessing Xmax is 3-4mm? oops, too many questions! thanks again, Grant

12th July 2009, 01:22 PM	#7
grantnsw diyAudio Member Join Date: Aug 2006	Thanks Pano, You get around man! Moved from your Kihei paradise? The Selenium SPL plot looks good, but its too costly to import, ( 3mm Xmax? ) Eminence drivers seem to have great credibility. The other driver I mentioned could be dodgy in that its graph looks a bit suss, ie no Z. So I wonder how accurate its T/S params are. Yeah, Tinitus likes the Beta-8 as a mid, its smooth, but I want to cross to a FR, something like the new TBand W8-1808, but thats very expensive and unavailable as yet.

13th July 2009, 12:42 AM	#10
Moondog55 diyAudio Member Join Date: Jun 2007 Location: Norlane; Geelong: Victoria: Australia	Grant that's an offer you can't refuse. Don't worry about the poor power handling, most of the time we listen at around a watt anyway. You can always load the rear of the driver with a cheap poly doona from K-Mart Ted __________________ QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
von schweikert unifield 3, an offshoot from "fullranger with helper woofer"	d to the g	Multi-Way	15	24th September 2008 10:34 AM
"Box" design and bracing for open baffle woofer array	ryoshu	Multi-Way	0	17th August 2008 06:07 PM
suspending a small tweeter in front of woofer for "coaxial" effect?	bikehorn	Multi-Way	3	2nd January 2006 02:04 PM
WTB: Focal & Audiom & Volts 11", 12", 13", 15" woofer	gengis	Swap Meet	0	17th March 2005 02:29 AM
cheap 6" or 8" woofer to make great bass for a standard cab pick up	zuki	Subwoofers	12	15th February 2005 07:54 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read