Peerless M21WO39-04

4Ω

Woofer

Nominal diameter	8″ / 203 mm
Resonance	30.9 Hz
Q factor	0.29
Sensitivity	90 dB
Linear excursion	± 5.9 mm
Program power	160 W

Discontinued

Peerless M21WO39-04 Woofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 90dB
Frequency response 20 - 10000Hz

Thiele & Small parameters

Resonance frequency (free air) fS 30.9Hz
Mechanical quality factor QMS 2.84
Electrical quality factor QES 0.33
Total quality factor QTS 0.29

Large signal parameters

Maximum linear excursion (one way) xmax 5.9mm
Air volume displaced at xmax VD 142cm³
Power handling P 80W
Program power Pmax 160W

Voice Coil

Nominal impedance Z 4Ω
DC resistance RE 2.8Ω
Inductance (1kHz) LE 0.24mH
VC Diameter 38.6mm
Former material Aluminium

Magnet

Force factor Bl 6.76N/A
Motor constant Bl/√RE 4.02N/√W
Air gap height HAG 6mm

Diaphragm

Effective diameter 175mm
Effective area SD 241cm²
Moving mass (including air load) MMS 27.1g
Moving mass MMD 24.5g

Suspensions

Stiffness KMS 1.02N/mm
Compliance CMS 980µm/N
Equivalent volume to the compliance VAS 79.7L
Mechanical resistance RMS 1.85N·s/m

Dimensions

Nominal diameter 8″
203mm
Volume occupied by the driver (estimated) 0.76L
Net weight 1.86kg

Peerless M21WO39-04 SPL & Impedance

Peerless M21WO39-04 Dimensions

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