Peerless TC9FD18-08

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.1dB
• Frequency response 70 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 130Hz
• Mechanical quality factor QMS 2.97
• Electrical quality factor QES 1.44
• Total quality factor QTS 0.97

Large signal parameters

• Maximum linear excursion xmax 3.9mm
• Air volume displaced at xmax VD 14cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.2Ω
• Inductance (1kHz) LE 0.108mH
• VC Diameter 19.4mm

Magnet

• Force factor Bl 3.13N/A
• Motor constant Bl/√RE 1.26N/√W
• Air gap height HAG 4mm
• Material Ferrite

Diaphragm

• Effective diameter 68mm
• Effective area SD 36.3cm²
• Moving mass MMS 2.67g
• Moving mass (without air load) MMD 2.5g
• Material Aluminum

Suspensions

• Stiffness KMS 1.92N/mm
• Compliance CMS 520µm/N
• Equivalent volume to the compliance VAS 0.978L
• Mechanical resistance RMS 0.73N·s/m
• Surround material NBR Rubber

Dimensions

• Nominal diameter 3.5″
• 89mm
• Volume occupied by the driver (estimated) 0.11L
• Net weight 0.3kg