VISATON FR 87 - 4 Ohm

• Sensitivity (1W, 1m, infinite baffle) SPL1W 87.7dB
• Frequency response 100 - 20000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 137Hz
• Mechanical quality factor QMS 6.40
• Electrical quality factor QES 1.56
• Total quality factor QTS 1.25

Large signal parameters

• Maximum linear excursion xmax 0.6mm
• Maximum excursion before damage xlim 2mm
• Air volume displaced at xmax VD 2.2cm³
• Power handling P 15W
• Program power Pmax 20W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.5Ω
• Inductance (1kHz) LE 0.2mH
• VC Diameter 15mm
• Winding height HVC 4.3mm

Magnet

• Force factor Bl 2.1N/A
• Motor constant Bl/√RE 1.12N/√W
• Air gap height HAG 3mm

Diaphragm

• Effective diameter 69mm
• Effective area SD 37cm²
• Moving mass MMS 2g
• Moving mass (without air load) MMD 1.8g

Suspensions

• Stiffness KMS 1.49N/mm
• Compliance CMS 670µm/N
• Equivalent volume to the compliance VAS 1.3L
• Mechanical resistance RMS 0.27N·s/m

Dimensions

• Nominal diameter 3.4″
• 87mm
• Baffle cutout diameter 80mm
• Net weight 0.21kg