Unexpected T/S Parameters-Vintage Oxford 15" Drivers

Kilroy · 13th November 2010, 12:05 AM

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

Flaesh · 12:47 AM

at first -

Quote:

Originally Posted by Kilroy

.. 15" drivers ..
Sd -- 213.82 cm^2 ..

must be about 8xx cm^2

Kilroy · 12:58 AM

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.

Kilroy · 01:50 AM

Quote:

Originally Posted by Kilroy

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?!

Pano · 13th November 2010, 02:00 AM

Vas? You have a Qms of 22! Can that be right? And 39g Mms? That's a light cone for a 15".

Kilroy · 02:21 AM

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.

Cal Weldon · 13th November 2010, 02:48 AM

15" with Fs of 78Hz and a Q of 2? Sounds like an old instrument speaker.

Cal Weldon · 13th November 2010, 02:51 AM

You have two threads for the same speaker?

"Acoustic Wagner" drivers?

Kilroy · 13th November 2010, 02:58 AM

Quote:

Originally Posted by Cal Weldon

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.

Kilroy · 13th November 2010, 03:02 AM

Quote:

Originally Posted by Cal Weldon

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.

13th November 2010, 12:05 AM	#1
Kilroy diyAudio Member Join Date: Feb 2010 Location: Austin, TX	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!

13th November 2010, 02:09 AM	#6
Kilroy 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.

13th November 2010, 02:48 AM	#7
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	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

13th November 2010, 02:51 AM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	You have two threads for the same speaker? "Acoustic Wagner" drivers? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

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13th November 2010, 02:00 AM	#5
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina 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".

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