Wavecor MR120BD01

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.6dB
• Frequency response 200 - 4000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 70Hz
• Mechanical quality factor QMS 8.40
• Electrical quality factor QES 0.47
• Total quality factor QTS 0.44

Large signal parameters

• Maximum linear excursion xmax 1.5mm
• Air volume displaced at xmax VD 7.5cm³

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.2Ω
• Inductance (1kHz, estimated) LE 0.23mH
• VC Diameter 25mm
• Winding height HVC 7mm
• Former material Black fiber glass

Magnet

• Force factor Bl 4.2N/A
• Motor constant Bl/√RE 2.35N/√W
• Air gap height HAG 4mm
• Diameter 90mm
• Weight 0.44kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 5.7g
• Moving mass (without air load) MMD 5.4g
• Material Kevlar/Carbon fiber

Suspensions

• Stiffness KMS 1.11N/mm
• Compliance CMS 900µm/N
• Equivalent volume to the compliance VAS 3.2L
• Mechanical resistance RMS 0.3N·s/m

Dimensions

• Nominal diameter 4.75″
• 120mm
• Overall diameter 120mm
• Baffle cutout diameter 98mm
• Mounting depth 64mm
• Volume occupied by the driver (estimated) 0.44L
• Net weight 1.1kg
• Frame material Die cast aluminum