Speaker - Jensen® Vintage Alnico, 8", P8R, 25W
One of the archetypical speakers in the range, the P8R has been installed in thousands of Champ and Princeton style amps for decades. Slightly clearer sounding than the C8R, its ceramic cousin, the P8R shines in clean and slightly crunch applications, where the typical chime of the AlNiCo magnets helps the sparkling harmonics to bloom.
Guitarist Description: Warm clean tone with emphasis on the highs. Responds to overdrive distortion with a warm and bright fuzz lead voice.
- Lows: Loose
- Mids: Subdued
- Highs: Bright
- Overdrive: Smooth
For more information about our Jensen® speakers, see our tech corner article on Jensen Speakers.
SKU:
P-A-P8R
Item ID:
001977
Brand:
JensenJensen VintageAlnico
Magnet Type:
Size:
Type:
RoHS Compliant
Accessory Items:
| Impedance | Our Part Number | UPC/EAN | Jensen Part Number |
|---|---|---|---|
| 4 Ω | P-A-P8R-4 | 8034028640063 | ZJ04050 |
| 8 Ω | P-A-P8R-8 | 8034028640056 | ZJ04040 |
| Basket Material | Pressed Sheet Steel | ||
| Cone Material | Paper | ||
| Depth | 4.1141 in. | ||
| Diameter | 8 in. | ||
| Diaphragm Area (SD) | 213.80 cm2 | ||
| Dust Dome Material | Solid Paper | ||
| Equivalent Acoustic Volume (VAS) | 4 Ω version | P-A-P8R-4 | 10.50 |
| 8 Ω version | P-A-P8R-8 | 10.30 liters | |
| Flux Density | 0.96 T | ||
| Force Factor (BxL) | 4 Ω version | P-A-P8R-4 | 3.72 Wb/m |
| 8 Ω version | P-A-P8R-8 | 3.99 Wb/m | |
| Inner Diameter | 7.0275 in. | ||
| Linear Displacement, maximum (XMAX) | 1.00 mm | ||
| Losses Electrical Resistance (RES) | 4 Ω version | P-A-P8R-4 | 16.00 Ω |
| 8 Ω version | P-A-P8R-8 | 27.00 Ω | |
| Magnet Assembly Depth | 1.9488 in. | ||
| Magnet Type | Alnico | ||
| Magnetic Gap Depth | 6.00 mm | ||
| Mechanical Compliance (CMS) | 4 Ω version | P-A-P8R-4 | 164.00 µm/N |
| 8 Ω version | P-A-P8R-8 | 159.00 µm/N | |
| Mechanical Moving Mass (MMS) | 4 Ω version | P-A-P8R-4 | 9.30 g |
| 8 Ω version | P-A-P8R-8 | 8.80 g | |
| Mechanical Q Factor (QMS) | 8.67 | ||
| 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-P8R-4 | 1.27 % |
| 8 Ω version | P-A-P8R-8 | 0.95 % | |
| Resonance Frequency (ƒS) | 4 Ω version | P-A-P8R-4 | 129.00 Hz |
| 8 Ω version | P-A-P8R-8 | 135.00 Hz | |
| Sensitivity @ 1W, 1m | 4 Ω version | P-A-P8R-4 | 94.10 dB |
| 8 Ω version | P-A-P8R-8 | 91.80 dB | |
| Surround Material | Integrated Paper | ||
| Surround Treatment | Yes | ||
| Total Q Factor (QTS) | 4 Ω version | P-A-P8R-4 | 1.43 |
| 8 Ω version | P-A-P8R-8 | 2.28 | |
| Voice Coil DC Resistance (Re) | 4 Ω version | P-A-P8R-4 | 3.00 Ω |
| 8 Ω version | P-A-P8R-8 | 6.60 Ω | |
| Voice Coil Diameter | 1 in. | ||
| Voice Coil Former | Epotex | ||
| Voice Coil Inductance @ 1 kHZ (LE) | 4 Ω version | P-A-P8R-4 | 0.21 mH |
| 8 Ω version | P-A-P8R-8 | 0.36 mH | |
| Voice Coil Winding Depth | 4.00 mm | ||
| Voice Coil Winding Type | Copper | ||
| Packaging Dimensions | 9.1 in. × 9.1 in. × 6 in. | ||
| Weight (Packaging) | 3.3576 lbs. | ||
| P-A-P8R-4 - 4 Ω version | Basket Material | Pressed Sheet Steel |
| Cone Material | Paper | |
| Depth | 4.1141 in. | |
| Diameter | 8 in. | |
| Diaphragm Area (SD) | 213.80 cm2 | |
| Dust Dome Material | Solid Paper | |
| Equivalent Acoustic Volume (VAS) | 10.50 | |
| Flux Density | 0.96 T | |
| Force Factor (BxL) | 3.72 Wb/m | |
| Inner Diameter | 7.0275 in. | |
| Linear Displacement, maximum (XMAX) | 1.00 mm | |
| Losses Electrical Resistance (RES) | 16.00 Ω | |
| Magnet Assembly Depth | 1.9488 in. | |
| Magnet Type | Alnico | |
| Magnetic Gap Depth | 6.00 mm | |
| Mechanical Compliance (CMS) | 164.00 µm/N | |
| Mechanical Moving Mass (MMS) | 9.30 g | |
| Mechanical Q Factor (QMS) | 8.67 | |
| 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) | 1.27 % | |
| Resonance Frequency (ƒS) | 129.00 Hz | |
| Sensitivity @ 1W, 1m | 94.10 dB | |
| Surround Material | Integrated Paper | |
| Surround Treatment | Yes | |
| Total Q Factor (QTS) | 1.43 | |
| Voice Coil DC Resistance (Re) | 3.00 Ω | |
| Voice Coil Diameter | 1 in. | |
| Voice Coil Former | Epotex | |
| Voice Coil Inductance @ 1 kHZ (LE) | 0.21 mH | |
| Voice Coil Winding Depth | 4.00 mm | |
| Voice Coil Winding Type | Copper | |
| P-A-P8R-8 - 8 Ω version | Basket Material | Pressed Sheet Steel |
| Cone Material | Paper | |
| Depth | 4.1141 in. | |
| Diameter | 8 in. | |
| Diaphragm Area (SD) | 213.80 cm2 | |
| Dust Dome Material | Solid Paper | |
| Equivalent Acoustic Volume (VAS) | 10.30 liters | |
| Flux Density | 0.96 T | |
| Force Factor (BxL) | 3.99 Wb/m | |
| Inner Diameter | 7.0275 in. | |
| Linear Displacement, maximum (XMAX) | 1.00 mm | |
| Losses Electrical Resistance (RES) | 27.00 Ω | |
| Magnet Assembly Depth | 1.9488 in. | |
| Magnet Type | Alnico | |
| Magnetic Gap Depth | 6.00 mm | |
| Mechanical Compliance (CMS) | 159.00 µm/N | |
| Mechanical Moving Mass (MMS) | 8.80 g | |
| Mechanical Q Factor (QMS) | 8.67 | |
| 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) | 0.95 % | |
| Resonance Frequency (ƒS) | 135.00 Hz | |
| Sensitivity @ 1W, 1m | 91.80 dB | |
| Surround Material | Integrated Paper | |
| Surround Treatment | Yes | |
| Total Q Factor (QTS) | 2.28 | |
| Voice Coil DC Resistance (Re) | 6.60 Ω | |
| Voice Coil Diameter | 1 in. | |
| Voice Coil Former | Epotex | |
| Voice Coil Inductance @ 1 kHZ (LE) | 0.36 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/p8r_blues.mp3
Clean Sound Sample00:15https://www.tubesandmore.com/sites/default/files/associated_files/p8r_clean.mp3
Country Sound Sample00:35https://www.tubesandmore.com/sites/default/files/associated_files/p8r_country.mp3
Jazz Sound Sample00:43https://www.tubesandmore.com/sites/default/files/associated_files/p8r_jazz.mp3
Metal Sound Sample00:53https://www.tubesandmore.com/sites/default/files/associated_files/p8r_metal.mp3
Overdriven Sound Sample00:15https://www.tubesandmore.com/sites/default/files/associated_files/p8r_overdriven.mp3
Rock Sound Sample00:41https://www.tubesandmore.com/sites/default/files/associated_files/p8r_rock.mp3
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Terminal Dimensions Questions? Contact us at [email protected], or give us a call at 480-820-5411
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Product Reviews
Perfect fit and replacement for my 73 Vibro Champ. Sounds really great right out of the box. I expect it will sound even better after 20 hours or so of break in. I have a Jupiter ceramic 8 on the way as well, just to hear the tone differences. Will be interesting to see how they compare. I am expecting the Jupiter to be a littler tighter in the low end and perhaps a little punchier, with the larger ceramic magnet.
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.