B&C Speaker 21SW150

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
• Frequency response 30 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 8.10
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 15mm
• Air volume displaced at xmax VD 2520cm³
• Power handling P 1500W
• Program power Pmax 3000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 150mm
• Winding height HVC 30mm
• Winding material Copper
• Former material Glass Fibre

Magnet

• Flux density B 1.2T
• Force factor Bl 32.6N/A
• Motor constant Bl/√RE 18.8N/√W
• Air gap height HAG 12mm
• Material Neodymium Ring

Diaphragm

• Effective diameter 462mm
• Effective area SD 1680cm²
• Moving mass MMS 494g
• Moving mass (without air load) MMD 446g
• Material Waterproof

Suspensions

• Stiffness KMS 15.9N/mm
• Compliance CMS 63µm/N
• Equivalent volume to the compliance VAS 254L
• Mechanical resistance RMS 11.1N·s/m
• Spider material Double Silicone

Dimensions

• Nominal diameter 21″
• 530mm
• Overall diameter 547mm
• Baffle cutout diameter 508mm
• Overall depth 250mm
• Flange thickness 16mm
• Mounting depth 234mm
• Volume occupied by the driver 15L
• Net weight 18.0kg