GRS 4PF-8

8Ω

Woofer

Nominal diameter	4″ / 105 mm
Resonance	137 Hz
Q factor	1.94
Sensitivity	88.1 dB
Linear excursion	± 1.5 mm
Program power	80 W

GRS 4PF-8 Woofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 88.1dB
Frequency response 100 - 10000Hz

Thiele & Small parameters

Resonance frequency (free air) fS 137Hz
Mechanical quality factor QMS 5.81
Electrical quality factor QES 2.90
Total quality factor QTS 1.94

Large signal parameters

Maximum linear excursion (one way) xmax 1.5mm
Air volume displaced at xmax VD 8.3cm³
Power handling P 40W
Program power Pmax 80W

Voice Coil

Nominal impedance Z 8Ω
DC resistance RE 6.8Ω
Inductance (1kHz) LE 0.5mH
VC Diameter 25mm

Magnet

Force factor Bl 3.1N/A
Motor constant Bl/√RE 1.19N/√W
Diameter 70mm

Diaphragm

Effective diameter 84mm
Effective area SD 55.2cm²
Moving mass (including air load) MMS 4.8g
Moving mass MMD 4.5g
Material Paper

Suspensions

Stiffness KMS 3.57N/mm
Compliance CMS 280µm/N
Equivalent volume to the compliance VAS 1.2L
Mechanical resistance RMS 0.71N·s/m
Surround material Foam

Dimensions

Nominal diameter 4″
105mm
Overall diameter 105mm
Baffle cutout diameter 94mm
Overall depth 54mm
Flange thickness 6mm
Mounting depth 49mm
Volume occupied by the driver (estimated) 0.15L

GRS 4PF-8 SPL

GRS 4PF-8 Dimensions

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