University alnico 12" spec request.

Racket Scientist · 15th August 2011, 06:21 PM

Just bought a University 12" alnico speaker to use in a guitar amp. Its a 6200 model rated for 30 watts, 8 ohm. Wondering if anyone can give me any specs or other info on these speakers? My understanding is that University was somehow linked to Altec, and that these have a "W" magnet, which is supposed to be a good thing.

I know this application would lead one to put this thread in the "Instruments" section, but as this driver was originally for other uses I thought those looking in this section might be more knowledgable.

GM · 16th August 2011, 03:51 AM

All I know is that the recommended cab was 5 ft^3 and F5 tuned to 40 Hz.

GM

AstroSonic · 16th August 2011, 08:45 PM

RC,

I have no experience with the 6200 12-inch full range, but have measured TS parameters for others of that period, including the 8 and 12 inch Diffusicones and the 6201 coax. The 6201 might be a close derivative, but there are critical differneces. The 6201 has the same magnetic structure as the 12 inch Diffusicone (based on visual inspection). The 6200 is spec'ed as having a 1 pound alnico magnet, while the Diffusicone has a 1 1/2 lb alnico magnet (see hifilit.com).

They all have relatively high Qts (0.4-0.7)and are quite efficient (95-97 db/w/m). Surround compliance is moderate so Vas tends to be moderate also. For example, for the 6201: Qts 0.50, Fs 50.5 Hz, Vas 3.28 cf, spl 94.6, Re 7.8 ohms (rated '8-16').

The highish Qts does mandate a quite large cabinet for BR use. All this is to suggest that the 6200 would probably work quite well in an open back cabinet about the size of a Fender Deluxe, especially with tube amplification and a little bass boost. For ss amplification more bass boost would be required. A vintage driver is not likely to take well to being overdriven by a ss amp. PP or SE 6V6 would be ideal.

Regards,

Bob

Racket Scientist · 17th August 2011, 01:02 PM

Thank you, that is very helpful. Sounds like I made a good choice. I've been searching for an alnico driver that will fit into a vintage Ampeg Jet, but be able to handle the 15 or so watts better than the stock Jensen, CTS, or Rola drivers. I love the sounds I get using something like a Celestion Blue, but the large magnet on those won't fit into the cab due to proximity to the tubes.

15th August 2011, 06:21 PM	#1
Racket Scientist diyAudio Member Join Date: Jan 2010	University alnico 12" spec request. Just bought a University 12" alnico speaker to use in a guitar amp. Its a 6200 model rated for 30 watts, 8 ohm. Wondering if anyone can give me any specs or other info on these speakers? My understanding is that University was somehow linked to Altec, and that these have a "W" magnet, which is supposed to be a good thing. I know this application would lead one to put this thread in the "Instruments" section, but as this driver was originally for other uses I thought those looking in this section might be more knowledgable.

16th August 2011, 03:51 AM	#2
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	All I know is that the recommended cab was 5 ft^3 and F5 tuned to 40 Hz. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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16th August 2011, 08:45 PM	#3
AstroSonic diyAudio Member Join Date: Jun 2004 Location: central Pennsylvania, USA	RC, I have no experience with the 6200 12-inch full range, but have measured TS parameters for others of that period, including the 8 and 12 inch Diffusicones and the 6201 coax. The 6201 might be a close derivative, but there are critical differneces. The 6201 has the same magnetic structure as the 12 inch Diffusicone (based on visual inspection). The 6200 is spec'ed as having a 1 pound alnico magnet, while the Diffusicone has a 1 1/2 lb alnico magnet (see hifilit.com). They all have relatively high Qts (0.4-0.7)and are quite efficient (95-97 db/w/m). Surround compliance is moderate so Vas tends to be moderate also. For example, for the 6201: Qts 0.50, Fs 50.5 Hz, Vas 3.28 cf, spl 94.6, Re 7.8 ohms (rated '8-16'). The highish Qts does mandate a quite large cabinet for BR use. All this is to suggest that the 6200 would probably work quite well in an open back cabinet about the size of a Fender Deluxe, especially with tube amplification and a little bass boost. For ss amplification more bass boost would be required. A vintage driver is not likely to take well to being overdriven by a ss amp. PP or SE 6V6 would be ideal. Regards, Bob

17th August 2011, 01:02 PM	#4
Racket Scientist diyAudio Member Join Date: Jan 2010	Thank you, that is very helpful. Sounds like I made a good choice. I've been searching for an alnico driver that will fit into a vintage Ampeg Jet, but be able to handle the 15 or so watts better than the stock Jensen, CTS, or Rola drivers. I love the sounds I get using something like a Celestion Blue, but the large magnet on those won't fit into the cab due to proximity to the tubes.

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