GRS 8PT-8

8Ω

Woofer

Nominal diameter	8″ / 197 mm
Resonance	59 Hz
Q factor	0.55
Sensitivity	90.2 dB
Linear excursion	± 7 mm
Program power	300 W

GRS 8PT-8 Woofer

Specifications

Sensitivity (1W, 1m, infinite baffle) SPL1W 90.2dB
Frequency response 55 - 9000Hz

Thiele & Small parameters

Resonance frequency (free air) fS 59Hz
Mechanical quality factor QMS 9.93
Electrical quality factor QES 0.59
Total quality factor QTS 0.55

Large signal parameters

Maximum linear excursion (one way) xmax 7mm
Air volume displaced at xmax VD 149cm³
Power handling P 150W
Program power Pmax 300W

Voice Coil

Nominal impedance Z 8Ω
DC resistance RE 7.1Ω
Inductance (1kHz) LE 1.5mH
VC Diameter 50.8mm
Winding height HVC 16mm

Magnet

Force factor Bl 10.2N/A
Motor constant Bl/√RE 3.83N/√W
Air gap height HAG 6mm
Diameter 140mm

Diaphragm

Effective diameter 165mm
Effective area SD 213cm²
Moving mass (including air load) MMS 23g
Moving mass MMD 20.8g
Material Paper

Suspensions

Stiffness KMS 3.23N/mm
Compliance CMS 310µm/N
Equivalent volume to the compliance VAS 20.2L
Mechanical resistance RMS 0.86N·s/m

Dimensions

Nominal diameter 8″
197mm
Overall diameter 197mm
Baffle cutout diameter 181mm
Overall depth 87mm
Flange thickness 8mm
Mounting depth 87mm
Volume occupied by the driver (estimated) 0.67L

GRS 8PT-8 SPL

GRS 8PT-8 Dimensions

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