Speaker - Jensen® Vintage Ceramic, 8", C8R, 25W
The C8R is the little gem in the Jensen Vintage series. It delivers a solid compact tone that defies its size. Extremely versatile, it finds application in small home and student amplifiers; but with a microphone in front, it is capable of transferring on tape some of the biggest tones ever. Not by chance, the vintage Fender® Champ® amplifiers produced with the C8R speaker are treasured by many players as a great studio tool.
Guitarist Description: Crystal clear tone with brightly shining highs. Responds to overdrive distortion with a bright fuzz lead voice.
- Lows: Tight
- Mids: Aggressive
- Highs: Bright
- Overdrive: Edgy
For more information about our Jensen® speakers, see our tech corner article on Jensen Speakers.
RoHS Compliant
| Impedance | Our Part Number | UPC/EAN | Jensen Part Number |
|---|---|---|---|
| 4 Ω | P-A-C8R-4 | 8034028640049 | ZJ04030 |
| 8 Ω | P-A-C8R-8 | 8034028640032 | ZJ04020 |
| Basket Material | Pressed Sheet Steel | ||
| Cone Material | Paper | ||
| Depth | 3.0629 in. | ||
| Diameter | 8 in. | ||
| Diaphragm Area (SD) | 213.80 cm2 | ||
| Dust Dome Material | Solid Paper | ||
| Equivalent Acoustic Volume (VAS) | 4 Ω version | P-A-C8R-4 | 10.30 liters |
| 8 Ω version | P-A-C8R-8 | 11.40 liters | |
| Flux Density | 1.00 T | ||
| Force Factor (BxL) | 4 Ω version | P-A-C8R-4 | 3.76 Wb/m |
| 8 Ω version | P-A-C8R-8 | 4.70 Wb/m | |
| Inner Diameter | 7.0275 in. | ||
| Linear Displacement, maximum (XMAX) | 1.00 mm | ||
| Losses Electrical Resistance (RES) | 4 Ω version | P-A-C8R-4 | 19.00 Ω |
| 8 Ω version | P-A-C8R-8 | 37.00 Ω | |
| Magnet Assembly Depth | 0.8976 in. | ||
| Magnet Assembly Diameter | 3.3858 in. | ||
| Magnet Type | Ferrite | ||
| Magnetic Gap Depth | 6.00 mm | ||
| Mechanical Compliance (CMS) | 4 Ω version | P-A-C8R-4 | 161.00 µm/N |
| 8 Ω version | P-A-C8R-8 | 176.00 µm/N | |
| Mechanical Moving Mass (MMS) | 4 Ω version | P-A-C8R-4 | 9.20 g |
| 8 Ω version | P-A-C8R-8 | 9.00 g | |
| Mechanical Q Factor (QMS) | 4 Ω version | P-A-C8R-4 | 9.65 |
| 8 Ω version | P-A-C8R-8 | 10.29 | |
| Mounting Hole Bolt Circle Diameter | 7.7559 in. | ||
| Mounting Hole Diameter | 0.1968 in. | ||
| Musical Power | 50.00 W | ||
| Nominal Overall Diameter | 207.00 mm | ||
| Nominal Voice Coil Diameter | 25.00 mm | ||
| Outer Diameter | 8.1496 in. | ||
| Rated Power | 25.00 W | ||
| Reference Efficiency (nO) | 4 Ω version | P-A-C8R-4 | 1.34 % |
| 8 Ω version | P-A-C8R-8 | 1.03 % | |
| Resonance Frequency (ƒS) | 4 Ω version | P-A-C8R-4 | 131.00 Hz |
| 8 Ω version | P-A-C8R-8 | 126.00 Hz | |
| Sensitivity @ 1W, 1m | 4 Ω version | P-A-C8R-4 | 94.40 dB |
| 8 Ω version | P-A-C8R-8 | 93.00 dB | |
| Surround Material | Integrated Paper | ||
| Surround Treatment | Yes | ||
| Total Q Factor (QTS) | 4 Ω version | P-A-C8R-4 | 1.42 |
| 8 Ω version | P-A-C8R-8 | 1.80 | |
| Voice Coil DC Resistance (Re) | 4 Ω version | P-A-C8R-4 | 3.00 Ω |
| 8 Ω version | P-A-C8R-8 | 6.73 Ω | |
| Voice Coil Diameter | 1 in. | ||
| Voice Coil Former | Kapton | ||
| Voice Coil Inductance @ 1 kHZ (LE) | 4 Ω version | P-A-C8R-4 | 0.22 mH |
| 8 Ω version | P-A-C8R-8 | 0.43 mH | |
| Voice Coil Winding Depth | 4.00 mm | ||
| Voice Coil Winding Type | Copper |
| Packaging Dimensions | 9.1 in. × 9.1 in. × 5.55 in. | |
| Weight (Packaging) | 2.6 lbs. |
| P-A-C8R-4 - 4 Ω version | Basket Material | Pressed Sheet Steel |
| Cone Material | Paper | |
| Depth | 3.0629 in. | |
| Diameter | 8 in. | |
| Diaphragm Area (SD) | 213.80 cm2 | |
| Dust Dome Material | Solid Paper | |
| Equivalent Acoustic Volume (VAS) | 10.30 liters | |
| Flux Density | 1.00 T | |
| Force Factor (BxL) | 3.76 Wb/m | |
| Inner Diameter | 7.0275 in. | |
| Linear Displacement, maximum (XMAX) | 1.00 mm | |
| Losses Electrical Resistance (RES) | 19.00 Ω | |
| Magnet Assembly Depth | 0.8976 in. | |
| Magnet Assembly Diameter | 3.3858 in. | |
| Magnet Type | Ferrite | |
| Magnetic Gap Depth | 6.00 mm | |
| Mechanical Compliance (CMS) | 161.00 µm/N | |
| Mechanical Moving Mass (MMS) | 9.20 g | |
| Mechanical Q Factor (QMS) | 9.65 | |
| Mounting Hole Bolt Circle Diameter | 7.7559 in. | |
| Mounting Hole Diameter | 0.1968 in. | |
| Musical Power | 50.00 W | |
| Nominal Overall Diameter | 207.00 mm | |
| Nominal Voice Coil Diameter | 25.00 mm | |
| Outer Diameter | 8.1496 in. | |
| Rated Power | 25.00 W | |
| Reference Efficiency (nO) | 1.34 % | |
| Resonance Frequency (ƒS) | 131.00 Hz | |
| Sensitivity @ 1W, 1m | 94.40 dB | |
| Surround Material | Integrated Paper | |
| Surround Treatment | Yes | |
| Total Q Factor (QTS) | 1.42 | |
| Voice Coil DC Resistance (Re) | 3.00 Ω | |
| Voice Coil Diameter | 1 in. | |
| Voice Coil Former | Kapton | |
| Voice Coil Inductance @ 1 kHZ (LE) | 0.22 mH | |
| Voice Coil Winding Depth | 4.00 mm | |
| Voice Coil Winding Type | Copper | |
| P-A-C8R-8 - 8 Ω version | Basket Material | Pressed Sheet Steel |
| Cone Material | Paper | |
| Depth | 3.0629 in. | |
| Diameter | 8 in. | |
| Diaphragm Area (SD) | 213.80 cm2 | |
| Dust Dome Material | Solid Paper | |
| Equivalent Acoustic Volume (VAS) | 11.40 liters | |
| Flux Density | 1.00 T | |
| Force Factor (BxL) | 4.70 Wb/m | |
| Inner Diameter | 7.0275 in. | |
| Linear Displacement, maximum (XMAX) | 1.00 mm | |
| Losses Electrical Resistance (RES) | 37.00 Ω | |
| Magnet Assembly Depth | 0.8976 in. | |
| Magnet Assembly Diameter | 3.3858 in. | |
| Magnet Type | Ferrite | |
| Magnetic Gap Depth | 6.00 mm | |
| Mechanical Compliance (CMS) | 176.00 µm/N | |
| Mechanical Moving Mass (MMS) | 9.00 g | |
| Mechanical Q Factor (QMS) | 10.29 | |
| Mounting Hole Bolt Circle Diameter | 7.7559 in. | |
| Mounting Hole Diameter | 0.1968 in. | |
| Musical Power | 50.00 W | |
| Nominal Overall Diameter | 207.00 mm | |
| Nominal Voice Coil Diameter | 25.00 mm | |
| Outer Diameter | 8.1496 in. | |
| Rated Power | 25.00 W | |
| Reference Efficiency (nO) | 1.03 % | |
| Resonance Frequency (ƒS) | 126.00 Hz | |
| Sensitivity @ 1W, 1m | 93.00 dB | |
| Surround Material | Integrated Paper | |
| Surround Treatment | Yes | |
| Total Q Factor (QTS) | 1.80 | |
| Voice Coil DC Resistance (Re) | 6.73 Ω | |
| Voice Coil Diameter | 1 in. | |
| Voice Coil Former | Kapton | |
| Voice Coil Inductance @ 1 kHZ (LE) | 0.43 mH | |
| Voice Coil Winding Depth | 4.00 mm | |
| Voice Coil Winding Type | Copper |
 Specification Sheet | All Models |
 Blues Sound Sample | All Models |
| Clean Sound Sample | All Models |
| Country Sound Sample | All Models |
| Jazz Sound Sample | All Models |
| Metal Sound Sample | All Models |
| Overdriven Sound Sample | All Models |
| Rock Sound Sample | All Models |
 Terminal Dimensions | All Models |
My Project Lists
Specifications, Files, and Documents
Sound Samples:
Blues Sound Sample00:49https://www.tubesandmore.com/sites/default/files/associated_files/c8r_blues.mp3
Clean Sound Sample00:18https://www.tubesandmore.com/sites/default/files/associated_files/c8r_clean.mp3
Country Sound Sample00:35https://www.tubesandmore.com/sites/default/files/associated_files/c8r_country.mp3
Jazz Sound Sample00:43https://www.tubesandmore.com/sites/default/files/associated_files/c8r_jazz.mp3
Metal Sound Sample00:53https://www.tubesandmore.com/sites/default/files/associated_files/c8r_metal.mp3
Overdriven Sound Sample00:18https://www.tubesandmore.com/sites/default/files/associated_files/c8r_overdriven.mp3
Rock Sound Sample00:41https://www.tubesandmore.com/sites/default/files/associated_files/c8r_rock.mp3
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Terminal Dimensions Questions and Answers
Click each question to see its answers.
2 answers
25 watt rms o peak power?
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff Member
Rated power 25 watts. Musical power 50 watts. See the specification sheet for more information
Specification sheet missing basic operating parameters. Peak power is the max power handling capability (in watts) at any instant of time. RMS (root mean square)max power handling capability (in watts) is the amount of continuous power. Since this is not identified, the "25 watt" power rating statement means nothing at all and does not identify the speakers power rating.
1 answers
Can i use this to repair an ampeg BA108?
Asked by Anonymous on August 27th, 2015.
August 27th, 2015
Staff Member
The Jensen C8R is not a bass speaker and the results, if used for bass, would not be suitable.
1 answers
Where is this speaker made? What is the country of origin? Thank you.
Asked by Pjalmy on September 2nd, 2017.
September 6th, 2017
Staff Member
These speakers are made in Italy.
1 answers
Hi, I just got Ampeg G18. I need to replace speaker but there is no info 4 or 8ohm. which one should I buy it.
Asked by Anonymous on April 11th, 2018.
April 11th, 2018
Staff Member
Please see our video on finding a speakers impedance: https://www.youtube.com/watch?v=4Ocgo1p8Z3Y
1 answers
I have a silvertone guitar and amp in the case.uses 2ea12ax7 tubes and 16v6gt and 1 6x4. has a Jensen c8t c7571-5 speaker .what should I use?
Asked by Anonymous on September 29th, 2019.
October 1st, 2019
Staff Member
Any 8" instrument speaker should work provided that the ohm rating is correct and the amp cabinet has sufficient room for the depth of the speaker.
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Product Reviews
I was a little hesitant that this speaker would work for my unique application. I'm not using it for a guitar amp but as a replacement speaker for a 1948 AM/FM/Phono radio that the original 10" speaker was missing. It turns out this speaker works great. I went with the 8" version instead of a bigger one to get a greater frequency range and am glad I did.
This thing rocks even though the tube amp is only putting out 5w.
Sounded great in a 1973 Bronco I installed it in. 4 ohm version.
I used two of these speakers (8 ohm in parallel) in a clone of the Magnatone Melodier 109 that I built. They turned out to be a perfect match for the self-split push-pull circuit. They have a rich sound when played clean, and they handle the output-tube distortion that the amp produces beautifully. Absolutely perfect for blues. And the price is right! My go-to 8" speaker.