Peerless NE123W-04

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.7dB
• Frequency response 100 - 8000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 78Hz
• Mechanical quality factor QMS 5.49
• Electrical quality factor QES 0.46
• Total quality factor QTS 0.43

Large signal parameters

• Maximum linear excursion xmax 4.3mm
• Air volume displaced at xmax VD 23cm³
• Power handling P 35W
• Program power Pmax 70W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.4Ω
• Inductance (1kHz) LE 0.082mH
• VC Diameter 32.4mm

Magnet

• Force factor Bl 5.09N/A
• Motor constant Bl/√RE 2.76N/√W
• Air gap height HAG 4mm
• Material Neodymium

Diaphragm

• Effective diameter 83mm
• Effective area SD 54.1cm²
• Moving mass MMS 7.23g
• Moving mass (without air load) MMD 6.9g
• Material Patented PentaCut

Suspensions

• Stiffness KMS 1.75N/mm
• Compliance CMS 570µm/N
• Equivalent volume to the compliance VAS 2.38L
• Mechanical resistance RMS 0.65N·s/m

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.15L
• Net weight 0.413kg
• Frame material Cast Aluminium