General Characteristics
Nominal Overall Diameter 307 mm 12 in
Nominal Voice Coil Diameter 38 mm 1.5 in
Magnet Weight 810 g 29 oz
Overall Weight 3.3 kg 7.28 lbs
Flux Density 1.15 T
Voice Coil Winding Depth 10 mm 0.39 in
Magnetic Gap Depth 8 mm 0.31 in
Thiele-Small Parameters
Nominal Impedance 16Ω
Voice Coil DC Resistance RE 6.5 Ω 6.05 Ω 12.5 Ω
Resonance Frequency ƒS 113.3 Hz 113 Hz 110 Hz
Mechanical Q Factor QMS 6.55 7.52 6.84
Electrical Q Factor QES 1.25
Total Q Factor QTS 0.82 1.02 1.06
Mechanical Moving Mass MMS 29.4 g 29.9 g 25.6 g
Mechanical Compliance CMS 67 µm/N 66 µm/N 83 µm/N
Force Factor BxL 8.6 Wb/m 10.46 Wb/m 13.35 Wb/m
Equivalent Acoustic Volume VAS 22.8 lt. 22.6 lt. 28 lt.
Maximum Linear Displacement XMAX ± 1.5 mm ± 1 mm ± 1 mm
Reference Efficiency nO 3.4 % 3.48 % 2.8 %
Diaphragm Area SD 490.9 cm2 490.9 cm2 490.9 cm2
Losses Electrical Resistance RES 23.2 Ω 42.5 Ω 70 Ω
Voice Coil Inductance @ 1kHz LE 0.58 mH 0.9 mH 1.55 mH
Constructive Characteristics
Magnet Ferrite
Voice Coil Winding Copper
Voice Coil Former Kapton
Cone Material Paper
Surround Material Integrated Paper
Dust Dome Material Solid Paper
Basket Material Pressed Sheet Steel
Surround Treatment No
Electrical Characteristics
Nominal Impedance 16Ω
Rated Power 50 W 50 W 50 W
Musical Power 100 W 100 W 100 W
Sensitivity@1W,1m 98.4 dB 97.7 dB 97.5 dB
50 watts
Available in 4Ω, 8Ω, 16Ω

The C12N is one of the most important speakers in Jensen’s history. It is the top 12” speaker of the ‘Blackface Era, used by many American manufacturers in the mid ‘60s for their upper range models when the price of AlNiCo became unsustainable for the manufacturers. Clear highs, solid mids, and powerful basses, it epitomizes the tone of that decade, from the surf, the rock n’ roll, the electric blues and the West Coast inspired music. It was used in Twin, Bassmanä and Bandmasterä style amps, and many others.

Guitarist Description
Smooth and straightforward, full bodied tone with high frequency chime. It responds to overdrive distortion with powerful mid bite.
Specification Sheet
Product Dimensions
Note: all dimensions are in mm.
User Reviews

Great attack! I was surprised by the harshness but a few tweeks (less treble and more mid) on my Fender '65 Twin Reissue and they warmed up real nice. Loud too! Great speakers.

Marc Provencher

Recently, I replaced the original Oxford speaker in my '67 Deluxe Reverb with a new jensen C12N speaker. I also replaced the 6V6 power tubes with 2 6L6s . Result, no drummer is now too loud, even though it's still a 20 watt amp. Beautiful clean, rich tones and the breakup is still there, of course, when required. I never put the volume past 4!


I own a standard Fender Blues Junior, I discovered a variant of this amp in a Tweed version, which had a Jensen C12N. The difference was very apparent when I did an A/B comparison. I now play the Tweed amp more than the Tolex version. By the way, I also own a Fender 59 Bassman Ltd with four Jensen 10" speakers and it blows everything else out the door! Nuff said! I am a happy customer! Thanks!.

Tom in New York City, New York

I use a reissue Fender Deluxe Reverb with a Jensen C12N an the tone is everything that a working Blues player could want. I have tried other speakers but I always go back to the Jensens. I even have them in my 68 Princeton Reverb, my 57 Deluxe and my Pro Junior.

Reverend Paul in Rochester, NY

I put some C12N in my newly acquired 1975 Twin Reverb. I tried a few non Jensen speakers and none seemed to work. The C12N are perfect and just the right balance. The base isn't flubby or over powering when playing full chords, the highs are not spiky or shrill when soloing, the C12N are very dynamic and full sounding. What also impressed me was how good these speakers sound right out of the box. IMO That's kind of rare for a speaker to sound that good that new.. I'm totally excited that these C12N are only going to get even better as they get broken in. These speakers make my Twin Reverb a joy to play. I've also got many compliments on the Twin Reverbs tone. Totally impressed, totally satisfied...

P. C.

Just got the Fender Hot Rod Deluxe S.E. with the C12N speaker and love it, put the tube screamer pedal on it and it comes alive, for a small package it handles the task easily, play everything from gospel to rock and it sounds equally good clean or gritty, good stuff.


Just installed my C12N into my Blues Junior and what a difference its made. It is like the difference between instant and filter coffee, just a far richer, deeper more developed tone with 10 times the presence. A true Blues tone...

Marco in London, England

I was able to get a good deal on a pair of C12N speakers to replace the pair of Jensen Vibrantos that were originally in my 1968 Fender Bandmaster. They sure do sound sweet.

Joseph in Medford, NY

I picked up a couple of C12N reissues that sound great in my vintage Fender Bandmaster Cabinet. Jensen Speakers were the originals that gave Fender their classic sound. So thanks for all.

Gilbert in Cupertino, CA

Great speakers. Liked them so much I picked up a C12N, P12Q and MOD 12-50 to re-do three respective new amps to give them a more vintage tone.

Brian in Greenwood, IN

I have a Fender twin that sports two Jensen C12N's and am very happy with the sound.

Jeff in Eden, NC