57RA45M
Key Features:
  • 2.2" (57mm), 45 ohm
  • Voice Range, 500 milliwatts
  • Alnico magnet, Mylar cone
  • RoHS Compliant;

Primary Specifications

Speakers Environment Outdoor
ROHS Compliant Yes

Technical Specifications

UNIT of MEASURE
Nominal Basket Diameter 2.2 / 57.0 inch / mm
Rated Impedance 45 ohms
Rated Power 0.0 Watts
Program Power 1 Watts
Frequency Range 400 - 4000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
83 dB SPL
Voice Coil Diameter 0.6 / 15.2 inch / mm
Magnet Weight 0.4 / 10 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 400 Hz
D.C. Resistance (Re) 45.0 ohms
Mechanical Q (Qms) 4.7
Electrical Q (Qes) 12.31
Total Q (Qts) 3.42
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 Stamped Steel
Terminal Size 0.12 X 0.02
Magnet Alnico
Voice Coil Wire Copper
Voice Coil Form Paper
Cone Mylar
Cone Edge Mylar
Dust Cap Mylar
http://s3.amazonaws.com/misco/curves/57RA45M.JPG?1345609668
ID Description Measurements Tolerance
OD Outside Diameter 2.3 in. +/- 0.040”
CD Cutout Diameter 2.0 in. +/- 0.030”
MG Magnet Diameter 0.9 in. +/- 0.050”
HD Hole Diameter +/- 0.020”
MD Mounting Diameter +/- 0.020”
ID Internal Depth 0.7 in. Maximum
FT Flange Thickness 0.1 in. +/- 0.050”
NW Net Weight 38.0 g
neodymium