P8R
| Nominal Overall Diameter | 207 mm | 8 in |
| Nominal Voice Coil Diameter | 25 mm | 0.98 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 |
| Nominal Impedance | 4Ω | 8Ω | |
|---|---|---|---|
| Voice Coil DC Resistance | RE | 3 Ω | 6.6 Ω |
| Resonance Frequency | ƒS | 129 Hz | 135 Hz |
| Mechanical Q Factor | QMS | 8.67 | 8.67 |
| Electrical Q Factor | QES | 3.09 | |
| Total Q Factor | QTS | 1.43 | 2.28 |
| Mechanical Moving Mass | MMS | 9.3 g | 8.8 g |
| Mechanical Compliance | CMS | 164 µm/N | 159 µm/N |
| Force Factor | BxL | 3.72 Wb/m | 3.99 Wb/m |
| Equivalent Acoustic Volume | VAS | 10.5 lt. | 10.3 lt. |
| Maximum Linear Displacement | XMAX | ± 1 mm | ± 1 mm |
| Reference Efficiency | nO | 1.27 % | 0.95 % |
| Diaphragm Area | SD | 213.8 cm2 | 213.8 cm2 |
| Losses Electrical Resistance | RES | 16 Ω | 27 Ω |
| Voice Coil Inductance @ 1kHz | LE | 0.21 mH | 0.36 mH |
| 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 |
| Nominal Impedance | 4Ω | 8Ω | |
|---|---|---|---|
| Rated Power | 25 W | 25 W | |
| Musical Power | 50 W | 50 W | |
| Sensitivity@1W,1m | 94.1 dB | 91.8 dB |
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.
After being disappointed by lots of dull and flat sounding speakers universally praised as true '50s and '60s Jensens replicas, I've put a Jensen C12Q RI on my self-made Deluxe Reverb and I've finally started hearing what I was expecting - sparkling, chime, incredible touch response, strong attack and gritty 3D overdrive. It was immediately followed by a P12R on my Tweed Deluxe and a P8R on Tweed Champ, with great satisfaction. Everything you read around on forums, about how new Jensens sound nothing like the old ones, is pure bull from deaf people: if you crave authentic vintage Fender sound, this is it.
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.
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.
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.
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.
