Speaker - Jensen® Vintage Ceramic, 8", C8R, 25W

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Speaker - Jensen® Vintage Ceramic, 8", C8R, 25W

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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
Item ID:
JensenJensen VintageCeramic
Part Numbers
ImpedanceOur Part NumberUPC/EANJensen Part Number
4 ΩP-A-C8R-48034028640049 ZJ04020
8 ΩP-A-C8R-88034028640032 ZJ04020
Product Measurements
Basket MaterialPressed Sheet Steel
Cone MaterialPaper
Depth3.0629 in.
Diameter8 in.
Diaphragm Area (SD)213.80 cm2
Dust Dome MaterialSolid Paper
Equivalent Acoustic Volume (VAS)4 Ω version10.30 liters
8 Ω version11.40 liters
Flux Density1.00 T
Force Factor (BxL)4 Ω version3.76 Wb/m
8 Ω version4.70 Wb/m
Inner Diameter7.0275 in.
Linear Displacement, maximum (XMAX)1.00 mm
Losses Electrical Resistance (RES)4 Ω version19.00 Ω
8 Ω version37.00 Ω
Magnet Assembly Depth0.8976 in.
Magnet Assembly Diameter3.3858 in.
Magnet TypeFerrite
Magnetic Gap Depth6.00 mm
Mechanical Compliance (CMS)4 Ω version161.00 µm/N
8 Ω version176.00 µm/N
Mechanical Moving Mass (MMS)4 Ω version9.20 g
8 Ω version9.00 g
Mechanical Q Factor (QMS)4 Ω version9.65
8 Ω version10.29
Mounting Hole Bolt Circle Diameter7.7559 in.
Mounting Hole Diameter0.1968 in.
Musical Power50.00 W
Nominal Overall Diameter207.00 mm
Nominal Voice Coil Diameter25.00 mm
Outer Diameter8.1496 in.
Rated Power25.00 W
Reference Efficiency (nO)4 Ω version1.34 %
8 Ω version1.03 %
Resonance Frequency (ƒS)4 Ω version131.00 Hz
8 Ω version126.00 Hz
Sensitivity @ 1W, 1m4 Ω version94.40 dB
8 Ω version93.00 dB
Surround MaterialIntegrated Paper
Surround TreatmentYes
Total Q Factor (QTS)4 Ω version1.42
8 Ω version1.80
Voice Coil DC Resistance (Re)4 Ω version3.00 Ω
8 Ω version6.73 Ω
Voice Coil Diameter1 in.
Voice Coil FormerKapton
Voice Coil Inductance @ 1 kHZ (LE)4 Ω version0.22 mH
8 Ω version0.43 mH
Voice Coil Winding Depth4.00 mm
Voice Coil Winding TypeCopper
Packaging Information
Packaging Dimensions9.1 in. × 9.1 in. × 5.55 in.
Weight (Packaging)2.6 lbs.

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Specifications, Files, and Documents

Sound Samples:

PDF: Specification Sheet Specification Sheet182.17 KB
PNG: Terminal Dimensions Terminal Dimensions21.21 KB

Questions and Answers

Click each question to see its answers.
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.
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
Asked by Anonymous on April 19th, 2017.
Matt H
April 19th, 2017
We do not recommend this Jensen speaker for bass. If you want to run bass and guitar out of one amp a PA speaker is a good choice. Please email us directly at: info@amplifiedparts.com for more information.
Asked by Anonymous on September 6th, 2017.
Matt H
September 6th, 2017
These speakers are made in Italy.
Asked by Anonymous on April 8th, 2018.
Matt H
April 11th, 2018
Please see our video on finding a speakers impedance: https://www.youtube.com/watch?v=4Ocgo1p8Z3Y
Asked by Anonymous on January 28th, 2019.
January 31st, 2019
Staff Member
It is possible it would work, but with these speakers being voiced for guitar amplifiers, it may not produce the ideal sound.

Product Reviews

5.00 out of 5 based on 3 reviews
- February 17th, 2020
5 out of 5

Just placed this Jensen C8R in a 1959 Supro "Super"1606, replacing the original Rola. I wanted to keep the Rola safe for the future.
The C8R is a great choice for this 5 watt gem. I suggest this is one of the most suitable and cost effective speaker choices for this type of amp (Champ style).
There is a beautiful natural and warm break up. Delighted with the purchase! So much fun to play with this amp now. Thanks Amplified Parts!

- November 17th, 2010
5 out of 5

Big improvement in tone for my 1980 SFVC. The speaker is better than the original and just popped right - no mods required. Highly recommend.

- August 4th, 2010
5 out of 5

popped this into my 65 champ. PERFECT. exactly what i've been looking for tonewise. it just keeps getting better and better.

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