JC420F-8A
Key Features:
  • 4.5" (115 mm), 8 ohm
  • Extended Range Music and Voice, 15 watt
  • Ferrite magnet, paper cone with Polyether foam surround;

Primary Specifications

Speakers Environment Indoor
ROHS Compliant No

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 4.5 / 115.0 inch / mm
Rated Impedance 8 ohms
Rated Power 15.0 Watts
Program Power 30 Watts
Frequency Range 80 - 20000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
90 dB SPL
Voice Coil Diameter 0.8 / 20.3 inch / mm
Magnet Weight 10.0 / 284 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 83 Hz
D.C. Resistance (Re) 6.8 ohms
Mechanical Q (Qms) 2.7
Electrical Q (Qes) 0.46
Total Q (Qts) 0.39
Compliance Equivalent Volume (Vas) 6.0 ltr
BL Product (BL) 5.5 T-M
Maximum Linear Excursion (Xmax) 1.2 mm
Surface Area of Cone (Sd) 68.0 cm2
Moving Mass (Mmd) g

Material Descriptions

 
Basket Stamped Steel
Terminal Size 0.205 x 0.02
Magnet Ferrite
Voice Coil Wire Copper
Voice Coil Form Aluminum
Cone Paper
Cone Edge Polyether Foam
Dust Cap Felt
http://s3.amazonaws.com/misco/curves/JC420F-8A.JPG?1345610244
ID Description Measurements Tolerance
OD Outside Diameter 4.6 in. +/- 0.040”
CD Cutout Diameter 4.1 in. +/- 0.030”
MG Magnet Diameter 3.4 in. +/- 0.050”
HD Hole Diameter 0.2 in. +/- 0.020”
MD Mounting Diameter 4.7 in. +/- 0.020”
ID Internal Depth 1.8 in. Maximum
FT Flange Thickness 0.1 in. +/- 0.050”
NW Net Weight 798.0 g
ceramic