BishopSound BDP18/4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 77.8dB
• Frequency response 35 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 35Hz
• Mechanical quality factor QMS 5.20
• Electrical quality factor QES 0.25
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 11.3mm
• Maximum excursion before damage xlim 18mm
• Air volume displaced at xmax VD 137cm³
• Power handling P 1000W
• Program power Pmax 2000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 5.1Ω
• Inductance (1kHz) LE 1.6mH
• VC Diameter 100mm
• Winding height HVC 21mm
• Winding material Copper
• Former material Glass Fiber

Magnet

• Flux density B 1.1T
• Force factor Bl 26N/A
• Motor constant Bl/√RE 11.5N/√W
• Air gap height HAG 11mm
• Material Ferrite Ring

Diaphragm

• Effective diameter 124mm
• Effective area SD 121cm²
• Moving mass MMS 171g
• Moving mass (without air load) MMD 169g

Suspensions

• Stiffness KMS 11.1N/mm
• Compliance CMS 90µm/N
• Equivalent volume to the compliance VAS 298L
• Mechanical resistance RMS 4.3N·s/m

Dimensions

• Nominal diameter 18″
• 460mm
• Overall diameter 460mm
• Overall depth 202mm
• Flange thickness 12mm
• Mounting depth 190mm
• Volume occupied by the driver (estimated) 8.3L
• Net weight 17.0kg
• Frame material Aluminium