DB Drive G7 12.1

• Sensitivity (1W, 1m, infinite baffle) SPL1W 82.5dB

Thiele & Small parameters

• Resonance frequency (free air) fS 29.4Hz
• Mechanical quality factor QMS 2.11
• Electrical quality factor QES 0.44
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 35mm
• Air volume displaced at xmax VD 1646cm³
• Power handling P 4000W
• Program power Pmax 8000W

Voice Coil

• Nominal impedance Z 2 x 1Ω
• DC resistance (in series) RE 1.4Ω
• Inductance (1kHz, in series, estimated) LE 1.79mH
• VC Diameter 76.2mm

Magnet

• Force factor (in series) Bl 16N/A
• Motor constant Bl/√RE 13.5N/√W
• Material Ferrite

Diaphragm

• Effective diameter 245mm
• Effective area SD 470cm²
• Moving mass MMS 440g
• Moving mass (without air load) MMD 432g

Suspensions

• Stiffness KMS 14.9N/mm
• Compliance CMS 67µm/N
• Equivalent volume to the compliance VAS 21L
• Mechanical resistance RMS 38.6N·s/m
• Surround material Foam

Dimensions

• Nominal diameter 12″
• 305mm
• Overall diameter 328mm
• Baffle cutout diameter 283mm
• Mounting depth 244mm
• Volume occupied by the driver (estimated) 2.9L
• Frame material Aluminium