new 12" could be OB hit ?

cph2000 · 13th November 2007, 09:48 PM

The new 12" from new-commer SB Acoustic (former scan-speak people) could be nice for open baffle aplications:

fs = 19Hz
Qts =0.4
and linear coilt travel of 22 mm pp

12 SB34NRX75-6

BHTX · 13th November 2007, 10:50 PM

Why? Qts is suitable for a sealed alignment, or perhaps vented if you're nuts. Bl is pretty low too at a rated 10.7 Tm, but I'm assuming that Fs would go up and it wouldn't reach as low if it were much higher than that. Seems like a fairly nice driver though. What's the price?

As far as current woofers that are suitable stictly for OB use and are also easily obtainable, I have yet to find a better all around driver for the money than the 15" Augie from Hawthorne Audio, designed to be used with their large OB coax with a cheapo eminence tweeter that many people seem not to care for.

el`Ol · 14th November 2007, 04:01 AM

These look nice for OB, but for those who build big, for sure no boosting capabilities.
http://cgi.ebay.de/2-x-SEAS-25TV-EW-...QQcmdZViewItem

cph2000 · 14th November 2007, 09:02 PM

Quote:

Originally posted by BHTX
Why? Qts is suitable for a sealed alignment, or perhaps vented if you're nuts. Bl is pretty low too at a rated 10.7 Tm, but I'm assuming that Fs would go up and it wouldn't reach as low if it were much higher than that. Seems like a fairly nice driver though. What's the price?

As far as current woofers that are suitable stictly for OB use and are also easily obtainable, I have yet to find a better all around driver for the money than the 15" Augie from Hawthorne Audio, designed to be used with their large OB coax with a cheapo eminence tweeter that many people seem not to care for.

The 15" peerless SLS driver has a much lower Qts this driver is reportedly used in the well reviewed Jamo 909 speaker (OB).
With lower Qts drivers you obviously need some EQ.
But just look at the freq. response chart of the new SB acoustics driver (probably measured on a wide baffel) - not a lot of EQ would be needed.

This driver looks a lot like the woofers used in the hidiously expensive Lyngdorf - Steinway high end OB system - that reportedly uses woofers by Scandinavian audio research AKA SB acoustics!

454Casull · 15th November 2007, 01:46 AM

Also note that the graph shows response at 31.6cm.

Ang · 15th November 2007, 02:03 AM

forget the exact driver, but it is definitely NOT a peerless in the Jamo

BHTX · 15th November 2007, 10:34 AM

I always thought Jamo used their own drivers, no?

ttan98 · 15th November 2007, 10:44 AM

Just an educated guess here:

most big speaker companies normally design their own speaker drivers in accordance to their spec., and subcontract them to driver manufacturer because the former have

i. the design knowledge
ii. buying power for large no of drivers, if not order a min
quanity.

so their drivers are most likely propriety.

some of more knowldgeable people here can confirm or deny.

noah katz · 18th November 2007, 05:21 PM

"Bl is pretty low too at a rated 10.7 Tm, but I'm assuming that Fs would go up and it wouldn't reach as low if it were much higher than that."

BL has no effect on Fs.

BHTX · 18th November 2007, 08:57 PM

Yeah, makes sense. I thought about that for a second after I posted it. Thanks for the confirmation.

13th November 2007, 09:48 PM	#1
cph2000 diyAudio Member Join Date: Feb 2004 Location: copehagen	new 12" could be OB hit ? The new 12" from new-commer SB Acoustic (former scan-speak people) could be nice for open baffle aplications: fs = 19Hz Qts =0.4 and linear coilt travel of 22 mm pp 12 SB34NRX75-6 __________________ .

18th November 2007, 05:21 PM	#9
noah katz diyAudio Member Join Date: Jul 2004 Location: Mountain View, CA	"Bl is pretty low too at a rated 10.7 Tm, but I'm assuming that Fs would go up and it wouldn't reach as low if it were much higher than that." BL has no effect on Fs. __________________ ----------------------------------------- Noah

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
What makes an amplifier "bright", "warm", or "neutral"?	JohnS	Solid State	51	13th December 2009 06:42 PM
Charcoal "Supreem" hi-density foam "enclosure"	IG81	Multi-Way	0	23rd April 2009 01:34 PM
What Does Fostex "Rated Input" and "Music Power"	mark02131	Full Range	3	2nd January 2007 08:31 PM
Some final pics of "Stacks" revisited and "Askew" with stand	Andy G	Multi-Way	2	3rd February 2005 06:07 AM
Anyone used Scan-Speak's "Flow Resistors" or "Aperiodic Vents"?	Ignite	Multi-Way	3	18th November 2001 08:42 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


	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

13th November 2007, 10:50 PM	#2
BHTX diyAudio Member Join Date: Feb 2006	Why? Qts is suitable for a sealed alignment, or perhaps vented if you're nuts. Bl is pretty low too at a rated 10.7 Tm, but I'm assuming that Fs would go up and it wouldn't reach as low if it were much higher than that. Seems like a fairly nice driver though. What's the price? As far as current woofers that are suitable stictly for OB use and are also easily obtainable, I have yet to find a better all around driver for the money than the 15" Augie from Hawthorne Audio, designed to be used with their large OB coax with a cheapo eminence tweeter that many people seem not to care for.

14th November 2007, 04:01 AM	#3
el`Ol diyAudio Member Join Date: May 2005 Location: Bavarian Forest	These look nice for OB, but for those who build big, for sure no boosting capabilities. http://cgi.ebay.de/2-x-SEAS-25TV-EW-...QQcmdZViewItem

15th November 2007, 01:46 AM	#5
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Also note that the graph shows response at 31.6cm.

15th November 2007, 02:03 AM	#6
Ang diyAudio Member Join Date: Feb 2006 Location: Pittsburgh	forget the exact driver, but it is definitely NOT a peerless in the Jamo

15th November 2007, 10:34 AM	#7
BHTX diyAudio Member Join Date: Feb 2006	I always thought Jamo used their own drivers, no?

15th November 2007, 10:44 AM	#8
ttan98 diyAudio Member Join Date: Apr 2006 Location: Melb	Just an educated guess here: most big speaker companies normally design their own speaker drivers in accordance to their spec., and subcontract them to driver manufacturer because the former have i. the design knowledge ii. buying power for large no of drivers, if not order a min quanity. so their drivers are most likely propriety. some of more knowldgeable people here can confirm or deny.

18th November 2007, 08:57 PM	#10
BHTX diyAudio Member Join Date: Feb 2006	Yeah, makes sense. I thought about that for a second after I posted it. Thanks for the confirmation.

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