57RFT-25B-CC
Key Features:
  • 2.2" (57 mm), 25 ohm
  • 15 watt
  • Ferrite magnet, Phenolic 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 25 ohms
Rated Power 15.0 Watts
Program Power 30 Watts
Frequency Range 1250 - 13,000 Hz
Sensitivity
(2.83 V input measured at 1 Meter)
98 dB SPL
Voice Coil Diameter 0.6 / 15.2 inch / mm
Magnet Weight 0.8 / 23 oz / gr
Transformer

Small Signal Parameters

UNIT of MEASURE
Resonant Frequency (fo) 1250 Hz
D.C. Resistance (Re) 24.6 ohms
Mechanical Q (Qms) 24.4
Electrical Q (Qes) 28.75
Total Q (Qts) 13.19
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 0.110 X 0.02
Magnet Ferrite
Voice Coil Wire Copper
Voice Coil Form Paper
Cone black phenolic treated cloth
Cone Edge Pre-treated Black Cloth
Dust Cap Mylar
ID Description Measurements Tolerance
OD Outside Diameter 2.3 in. +/- 0.040”
CD Cutout Diameter 2.0 in. +/- 0.030”
MG Magnet Diameter 1.4 in. +/- 0.050”
HD Hole Diameter +/- 0.020”
MD Mounting Diameter +/- 0.020”
ID Internal Depth 0.9 in. Maximum
FT Flange Thickness 0.1 in. +/- 0.050”
NW Net Weight 80.0 g
ceramic