DB Drive P4M8C

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 115 - 2800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 109Hz
• Mechanical quality factor QMS 4.21
• Electrical quality factor QES 0.79
• Total quality factor QTS 0.67

Large signal parameters

• Power handling P 200W
• Program power Pmax 325W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.35mH

Magnet

• Force factor Bl 5.6N/A
• Motor constant Bl/√RE 3.13N/√W

Diaphragm

• Effective diameter 172mm
• Effective area SD 233cm²
• Moving mass MMS 11.2g
• Moving mass (without air load) MMD 8.7g

Suspensions

• Stiffness KMS 5.26N/mm
• Compliance CMS 190µm/N
• Equivalent volume to the compliance VAS 14.6L
• Mechanical resistance RMS 1.83N·s/m

Dimensions

• Nominal diameter 8″
• 203mm
• Volume occupied by the driver (estimated) 0.85L