Speaker size: (in) 10
Watts RMS: 400
Watts peak: 800
Impedance: D2/D4
VCD: (in) 2.5
Piston diameter: (in) 8
FS: (Hz) 38
Qms: 5.114
Qes: 0.693
Qts: 0.61
Vas: (liters) 17.73
dBSPL: 85
Xmech: (mm) 27
Xmax: (mm) 13
Frame OD: (in) 10
Frame OD w/Gasket: (in) 10.15

Mounting diameter: (in) 8.93
Mounting depth: (in) 5.96
Motor diameter: (in) 6.14
Motor depth: (in) 2.59
Magnet weight: (Oz) 100
Woofer displacement: (CuFt) 0.06
Ported enclosure: (CuFt) 1.25-1.50
Shipping weight: (lbs) 18.

Speaker size: (in) 15
Watts RMS: 500
Watts peak: 1000
Impedance: D2/D4
VCD: (in) 3
Piston diameter: (in) 13
FS: (Hz) 29
Qms: 6.205
Qes: 0.89
Qts: 0.778
Vas: (liters) 93.91
dBSPL: 89
Xmech: (mm) 30
Xmax: (mm) 14
Frame OD: (in) 15.02
Frame OD w/Gasket: (in) 14.04

Mounting diameter: (in) 13.89
Mounting depth: (in) 7.32
Motor diameter: (in) 6.69
Motor depth: (in) 2.59
Magnet weight: (Oz) 115
Woofer displacement: (CuFt) 0.1
Ported enclosure: (CuFt) 3.0-5.0
Shipping weight: (lbs) 22.

Features
- High power 12” SPL subwoofer
- Klippel® optimized
- Efficient triple magnet
- Massive aluminum cast basket
- Reinforced paper cone
- 3” copper voice coil
- High-Roll sandwich surround
- Double spider

Technical data
Model: GZHW 30SPL
Diameter: 300 mm / 12″
Mounting diameter: 315 mm / 12.4“
Mounting depth: 198 mm / 7.8“
Voice coil: 75 mm / 3” copper voice coil
Cone: Reinforced paper
Power Handling: 3000 W SPL Power
Impedance: 2 x 1 Ohm
SPL: 85 dB
Xmax: 45 mm / 1.77″
Fs: 35.4 Hz
Qts: 0.44
Vas: 15.8 L / 0.56 cu.ft.

Box recommendations : See owners manual.