BishopSound BWP18/4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.5dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 5.20
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 12mm
• Maximum excursion before damage xlim 15.3mm
• Air volume displaced at xmax VD 1596cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 2.1mH
• VC Diameter 125mm
• Winding height HVC 16mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.2T
• Force factor Bl 26.2N/A
• Motor constant Bl/√RE 11.6N/√W
• Air gap height HAG 11mm
• Material Ferrite Ring

Diaphragm

• Effective diameter 412mm
• Effective area SD 1330cm²
• Moving mass MMS 170g
• Moving mass (without air load) MMD 138g

Suspensions

• Stiffness KMS 14.3N/mm
• Compliance CMS 70µm/N
• Equivalent volume to the compliance VAS 378L
• Mechanical resistance RMS 4.21N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Overall depth 202mm
• Flange thickness 2mm
• Mounting depth 200mm
• Volume occupied by the driver 18L
• Net weight 19.0kg
• Frame material Aluminium