P8R

General Characteristics for 4Ω

Nominal Overall Diameter
207 mm
8 in
Nominal Voice Coil Diameter
25 mm
1 in
Magnet Weight
200 g
7 oz
Overall Weight
1.2 kg
2.65 lbs
Flux Density
0.96 T
Voice Coil Winding Depth
4 mm
0.16 in
Magnetic Gap Depth
6 mm
0.24 in

Thiele-Small Parameters for 4Ω

Voice Coil DC Resistance
RE
3 Ω
Resonance Frequency
ƒS
129 Hz
Mechanical Q Factor
QMS
8.67
Electrical Q Factor
QES
1.72
Total Q Factor
QTS
1.43
Mechanical Moving Mass
MMS
9.3 g
Mechanical Compliance
CMS
164 µm/N
Force Factor
BxL
3.72 Wb/m
Equivalent Acoustic Volume
VAS
10.5 lt.
Maximum Linear Displacement
XMAX
± 1 mm
Reference Efficiency
nO
1.27 %
Diaphragm Area
SD
213.8 cm2
Losses Electrical Resistance
RES
16 Ω
Voice Coil Inductance @ 1kHz
LE
0.21 mH

Constructive Characteristics for 4Ω

Magnet
Alnico
Voice Coil Winding
Copper
Voice Coil Former
Epotex
Cone Material
Paper
Surround Material
Integrated Paper
Dust Dome Material
Solid Paper
Basket Material
Pressed Sheet Steel
Surround Treatment
Yes

Electrical Characteristics for 4Ω

Nominal Impedance
4 Ω
Rated Power
25 W
Musical Power
50 W
Sensitivity@1W,1m
94.1 dB

General Characteristics for 8Ω

Nominal Overall Diameter
207 mm
8 in
Nominal Voice Coil Diameter
25 mm
1 in
Magnet Weight
200 g
7 oz
Overall Weight
1.2 kg
2.65 lbs
Flux Density
0.96 T
Voice Coil Winding Depth
4 mm
0.16 in
Magnetic Gap Depth
6 mm
0.24 in

Thiele-Small Parameters for 8Ω

Voice Coil DC Resistance
RE
6.6 Ω
Resonance Frequency
ƒS
135 Hz
Mechanical Q Factor
QMS
8.67
Electrical Q Factor
QES
2.3
Total Q Factor
QTS
2.28
Mechanical Moving Mass
MMS
8.8 g
Mechanical Compliance
CMS
159 µm/N
Force Factor
BxL
3.99 Wb/m
Equivalent Acoustic Volume
VAS
10.3 lt.
Maximum Linear Displacement
XMAX
± 1 mm
Reference Efficiency
nO
0.95 %
Diaphragm Area
SD
213.8 cm2
Losses Electrical Resistance
RES
27 Ω
Voice Coil Inductance @ 1kHz
LE
0.36 mH

Constructive Characteristics for 8Ω

Magnet
Alnico
Voice Coil Winding
Copper
Voice Coil Former
Epotex
Cone Material
Paper
Surround Material
Integrated Paper
Dust Dome Material
Solid Paper
Basket Material
Pressed Sheet Steel
Surround Treatment
Yes

Electrical Characteristics for 8Ω

Nominal Impedance
8 Ω
Rated Power
25 W
Musical Power
50 W
Sensitivity@1W,1m
91.8 dB
P8R
8",
25 watts
Ohms

Warm clean tone with emphasis on the highs. It responds to overdrive distortion with a warm and bright fuzz lead voice.

Lows
Loose
Mids
Subdued
Highs
Bright
Overdrive
Smooth
Guitarist Description
Warm clean tone with emphasis on the highs. Responds to overdrive distortion with a warm and bright fuzz lead voice.
Bassist Description
Warm and bright
Specification Sheet
Product Dimensions
Frequency Response Charts
User Reviews

Great replacement for the original Phillips in the silver face Vibro Champ. Late Breakup lets the tubes get into saturation while still having good touch sensitivity. Nice tone without modifying the amp.

David Thompson

Picked up a White model 80 amp at a swapmeet, it had tubes in the wrong sockets and a junky no-name modern speaker. Didn't know quite what it was at the time, but figured anything made in Fullerton might have a Fender link. I replaced the filter caps (saving the old ones) and installed tubes from my NOS stash. The final touch was ordering a Jensen P8R speaker. It's a great-sounding amp for harp, lap steel, and my Oscar Schmidt electric dobro.

Walt in California

The P8R is the bee's knees. I replaced the thing in the Bugera BC-15 with the P8R and I am one happy camper.

Ross Barkley

Found a Champ for five bucks at a garage sale that was pretty beat up. I did a complete cap job, put in a JJ 6V6 and a Jensen P8R. This amp now sounds fantastic.

Ben in Indianapolis, IN