Unexpected T/S Parameters-Vintage Oxford 15" Drivers - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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
Reply
 
Thread Tools Search this Thread
Old 13th November 2010, 12:05 AM   #1
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
Default Unexpected T/S Parameters-Vintage Oxford 15" Drivers

I was finally able to get Arta working and test the vintage Oxford/Acoustic Wagner 15" drivers I picked up.
The results weren't what I expected and I guess I need some help figuring out what it all means. ie.. Are they worth any more time and if so, in what sort of enclosure/baffle?

Parameter Value Dim
Fs -- 77.3 Hz
Re -- 7.2 ohms[dc]
Le -- 504.33 uH
L2 -- 1046.4 uH
R2 -- 17.56 ohms
Qt -- 2.6 -
Qes -- 2.99 -
Qms -- 20.27 -
Mms -- 39.26 grams
Rms -- 0.940817 kg/s
Cms -- 0.000108 m/N
Vas -- 6.93 liters
Sd -- 213.82 cm^2
Bl -- 6.780901 Tm
ETA -- 0.1 %
Lp(2.83V/1m) -- 82.7 dB
__________________
I made smoke!
  Reply With Quote
Old 13th November 2010, 12:40 AM   #2
Flaesh is online now Flaesh  Russian Federation
diyAudio Member
 
Flaesh's Avatar
 
Join Date: Dec 2009
Location: Eburg
at first -
Quote:
Originally Posted by Kilroy View Post
.. 15" drivers ..
Sd -- 213.82 cm^2 ..
must be about 8xx cm^2
__________________
flesh flash flush

Last edited by Flaesh; 13th November 2010 at 12:47 AM.
  Reply With Quote
Old 13th November 2010, 12:56 AM   #3
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
Ha! How'd I miss that?
That's weird... Arta asked for the membrane Diameter in cm... I entered 16.5. So I don't know how that happened.
Attached Images
File Type: jpg OxSPK_145-tsp.JPG (369.2 KB, 82 views)
__________________
I made smoke!

Last edited by Kilroy; 13th November 2010 at 12:58 AM.
  Reply With Quote
Old 13th November 2010, 01:47 AM   #4
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
Quote:
Originally Posted by Kilroy View Post
I entered 16.5.
Freakin' math.

The RIGHT T/S parameters!

Parameter Value Dim
Fs 77.58 Hz
Re 7.2 ohms[dc]
Le 518.26 uH
L2 1110.59 uH
R2 19.29 ohms
Qt 2.67 -
Qes 3.03 -
Qms 22.02 -
Mms 25.63 grams
Rms 0.56732 kg/s
Cms 0.000164 m/N
Vas 149.17 liters
Sd 804.25 cm^2
Bl 5.444417 Tm
ETA 2.21 %
Lp(2.83V/1m) 96 dB

But now the Vas looks funny?!
__________________
I made smoke!

Last edited by Kilroy; 13th November 2010 at 01:50 AM.
  Reply With Quote
Old 13th November 2010, 02:00 AM   #5
Pano is offline Pano  United States
diyAudio Moderator
 
Pano's Avatar
 
Join Date: Oct 2004
Location: Milliways
Blog Entries: 4
Vas? You have a Qms of 22! Can that be right? And 39g Mms? That's a light cone for a 15".
  Reply With Quote
Old 13th November 2010, 02:09 AM   #6
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
I don't know... This is the lightest driver over all that I've had in my hands over 10"... Maybe even over 8"... It's just not that substantial.
The cone is thin paper.... But that does seem a little on the light side... But if I messed up on the data entry this time, I can't see where.

Upon further examination
They have a very light, flexible cone with a very stiff surround...
I've honestly never seen anything quite like them.
__________________
I made smoke!

Last edited by Kilroy; 13th November 2010 at 02:21 AM.
  Reply With Quote
Old 13th November 2010, 02:48 AM   #7
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
15" with Fs of 78Hz and a Q of 2? Sounds like an old instrument speaker.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 13th November 2010, 02:51 AM   #8
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
You have two threads for the same speaker?

"Acoustic Wagner" drivers?
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 13th November 2010, 02:58 AM   #9
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
Quote:
Originally Posted by Cal Weldon View Post
You have two threads for the same speaker?

"Acoustic Wagner" drivers?
Yep. Sorry about that. I meant to put the T/S parameters in that thread but it slipped my mind.
__________________
I made smoke!
  Reply With Quote
Old 13th November 2010, 03:02 AM   #10
Kilroy is offline Kilroy  United States
diyAudio Member
 
Join Date: Feb 2010
Location: Austin, TX
Quote:
Originally Posted by Cal Weldon View Post
15" with Fs of 78Hz and a Q of 2? Sounds like an old instrument speaker.
They do look remarkably similar to the old Hammond Leslie drivers.
They were supposed to have come out of an in wall house installation, but I have my doubts.
__________________
I made smoke!
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FS: Vintage high-Qts 15" woofers like Eminence Alpha 15 nl Swap Meet 2 10th June 2009 10:15 PM
Two 15" late 1950s Vintage Magnavox Woofers with Alnico magnets for sale! WBS Swap Meet 0 23rd February 2009 11:22 PM
2 Jensen P15-RJ vintage 15" speakers GordonW Swap Meet 2 2nd August 2007 02:17 PM
Vintage Audax A150-X 15" coaxes whiteSE Swap Meet 2 1st January 2007 08:02 PM
how do i find thiel small parameters for the radio shack 40-1035 15" woofer zuki Multi-Way 7 18th February 2004 12:55 PM


New To Site? Need Help?

All times are GMT. The time now is 01:47 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2