Peerless TC7FD04-04

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.4dB
• Frequency response 100 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 210Hz
• Mechanical quality factor QMS 3.43
• Electrical quality factor QES 0.99
• Total quality factor QTS 0.77

Large signal parameters

• Maximum linear excursion xmax 2mm
• Air volume displaced at xmax VD 4.1cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 0.02mH
• VC Diameter 19.3mm

Magnet

• Force factor Bl 2.56N/A
• Motor constant Bl/√RE 1.39N/√W
• Air gap height HAG 3mm
• Material Ferrite

Diaphragm

• Effective diameter 51mm
• Effective area SD 20.4cm²
• Moving mass MMS 1.43g
• Moving mass (without air load) MMD 1.4g

Suspensions

• Stiffness KMS 2.56N/mm
• Compliance CMS 390µm/N
• Equivalent volume to the compliance VAS 0.229L
• Mechanical resistance RMS 0.55N·s/m
• Surround material Fabric

Dimensions

• Nominal diameter 2.5″
• 64mm
• Volume occupied by the driver (estimated) 0.12L
• Net weight 0.33kg
• Frame material Pressed Steel