4C8CFR
Key Features:
  • 4" (102 mm), 8 ohm
  • Voice Range, 10 watt
  • Alnico magnet, felted paper cone
  • NSN 596501145102
  • used in military cargo aircraft

Primary Specifications

Speakers Environment Indoor
ROHS Compliant No

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 4.11 / 104.0 inch / mm
Rated Impedance 8 ohms
Rated Power 10.0 Watts
Program Power Watts
Frequency Range 250 to 8000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
86 dB SPL
Voice Coil Diameter 0.75 / 19.0 inch / mm
Magnet Weight 1.0 / 28 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 310 Hz
D.C. Resistance (Re) 7.2 ohms
Mechanical Q (Qms)
Electrical Q (Qes)
Total Q (Qts)
Compliance Equivalent Volume (Vas) ltr
BL Product (BL) T-M
Maximum Linear Excursion (Xmax) mm
Surface Area of Cone (Sd) cm2
Moving Mass (Mmd) g

Material Descriptions

 
Basket Steel
Terminal Size 0.187 by 0.022
Magnet Alnico
Voice Coil Wire copper
Voice Coil Form aluminum
Cone felted paper
Cone Edge felted paper
Dust Cap felt cloth
http://s3.amazonaws.com/misco/curves/4C8CFR.JPG?1492700855
ID Description Measurements Tolerance
OD Outside Diameter 4.11 in. +/- 0.040”
CD Cutout Diameter 4.1 in. +/- 0.030”
MG Magnet Diameter 1.1 in. +/- 0.050”
HD Hole Diameter 0.2 in. +/- 0.020”
MD Mounting Diameter 4.69 in. +/- 0.020”
ID Internal Depth 1.39 in. Maximum
FT Flange Thickness 0.04 in. +/- 0.050”
NW Net Weight 121.0 g