R4-20-Y80-QP8, 4" Ferriet Low Frequency Transducer, 20mm voice coil

PRECISION TRANSDUCERS

R4-20-Y80-QP8

WOOFER

FEATURES

n  0.79 inch inside/outside copper voice coil

n  40 Watt continuous program power handling

n  94 dB sensitivity

n  146Hz-16KHz frequency range

n  BL of 3.914 Txm to provide a faster and accurate low frequency

SPECIFICATIONS (General specifications)

NOMINAL DIAMETER:  4 inch / 100 mm                             RATED IMPEDANCE: 8 ohm

AES POWER HANDLING: 20W                                         MAX. POWER HANDLING: 40 W

SENSITIVITY: 94.0 dB                                                             FREQUENCY RANGE:  146 Hz-16KHz

MINIMIM IMPEDANCE:  6.5 ohm                                             VOICE COIL DIAMETER: 0.79 inch / 20 mm 

VC WINDING MATERIAL: Copper                                          MAGNETS: Ferrite

OVERALL DIAMETER: 128 mm / 5.04 inches                          BOLT CIRCLE DIAMETER: 116 mm / 4.57 inch

 BAFFLE CUT-OUT DIAMETER: 102 mm / 4.02 inch

Thiele - small parameters

RESONANCE FREQUENCY (FS): 146 Hz                 DC RESISTANCE (RE): 5.2 ohm

MECHANICAL FACTOR: 5.708 Qms                          ELECTRICAL FACTOR (QES): 1.017  Qes

TOTAL FACTOR: 0.863 Qts                                        BL FACTOR (BL): 3.914 T x m 

EFFECTIVE MOVING MASS (MMS): 2.5 g          EQUIVALENT CAS AIR LOADED (VAS): 1.888 liters 

EFFETTIVE PISTON AREA (SD): 0.054 m2             VOICE COIL INDUCTANCE @ 1KHZ (LE1K): 0.459 MH