J8PA-4B
Key Features:
  • 8" (205mm), 4 ohm
  • Guitar speaker 12 watts
  • Alnico magnet, Paper cone and paper surround;

Primary Specifications

Speakers Environment Indoor
ROHS Compliant No

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 8.0 / 205.0 inch / mm
Rated Impedance 4 ohms
Rated Power 12.0 Watts
Program Power 24 Watts
Frequency Range 80 - 8,000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
98 dB SPL
Voice Coil Diameter 1.0 / 25.4 inch / mm
Magnet Weight 6.8 / 193 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 105 Hz
D.C. Resistance (Re) 3.5 ohms
Mechanical Q (Qms) 6.9
Electrical Q (Qes) 0.91
Total Q (Qts) 0.8
Compliance Equivalent Volume (Vas) 22.8 ltr
BL Product (BL) 4.2 T-M
Maximum Linear Excursion (Xmax) 2.2 mm
Surface Area of Cone (Sd) 219.0 cm2
Moving Mass (Mmd) g

Material Descriptions

 
Basket Stamped Steel
Terminal Size 0.205 x 0.02
Magnet Alnico
Voice Coil Wire Copper
Voice Coil Form Nomex
Cone Paper
Cone Edge Paper
Dust Cap Felt
http://s3.amazonaws.com/misco/curves/J8PA-4B.JPG?1345610219
ID Description Measurements Tolerance
OD Outside Diameter 8.1 in. +/- 0.040”
CD Cutout Diameter 7.0 in. +/- 0.030”
MG Magnet Diameter 1.4 in. +/- 0.050”
HD Hole Diameter 0.3 in. +/- 0.020”
MD Mounting Diameter 7.7 in. +/- 0.020”
ID Internal Depth 3.8 in. Maximum
FT Flange Thickness 0.2 in. +/- 0.050”
NW Net Weight 1136.0 g
ALNICO