66SF04-1SH
Key Features:
  • 2.5" (66mm), 4 ohm
  • Full Range, 2 watts
  • Ferrite magnet, paper cone with pre-treated black cloth surround
  • RoHS Compliant;

Primary Specifications

Speakers Environment Indoor
ROHS Compliant Yes

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 2.5 / 66.0 inch / mm
Rated Impedance 4 ohms
Rated Power 2.0 Watts
Program Power 4 Watts
Frequency Range 250 - 18000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
87 dB SPL
Voice Coil Diameter 0.6 / 15.2 inch / mm
Magnet Weight 1.7 / 48 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 291 Hz
D.C. Resistance (Re) 3.6 ohms
Mechanical Q (Qms) 4.3
Electrical Q (Qes) 3.32
Total Q (Qts) 1.88
Compliance Equivalent Volume (Vas) 0.2 ltr
BL Product (BL) 1.4 T-M
Maximum Linear Excursion (Xmax) mm
Surface Area of Cone (Sd) 23.0 cm2
Moving Mass (Mmd) g

Material Descriptions

 
Basket Stamped Steel
Terminal Size .110 X .020
Magnet Ferrite
Voice Coil Wire Copper
Voice Coil Form Paper
Cone Paper
Cone Edge Pre-treated Black Cloth
Dust Cap Mylar
http://s3.amazonaws.com/misco/curves/66SF04-1SH.JPG
ID Description Measurements Tolerance
OD Outside Diameter 2.7 in. +/- 0.040”
CD Cutout Diameter 2.6 in. +/- 0.030”
MG Magnet Diameter 1.8 in. +/- 0.050”
HD Hole Diameter 0.18 in. +/- 0.020”
MD Mounting Diameter 2.9 in. +/- 0.020”
ID Internal Depth 1.04 in. Maximum
FT Flange Thickness 0.12 in. +/- 0.050”
NW Net Weight 135.0 g
ceramic