Beyma 12WR400

• Sensitivity (1W, 1m, infinite baffle) SPL1W 94.9dB
• Frequency response 45 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 42Hz
• Mechanical quality factor QMS 5.60
• Electrical quality factor QES 0.28
• Total quality factor QTS 0.27

Large signal parameters

• Maximum linear excursion xmax 6.3mm
• Maximum excursion before damage xlim 30mm
• Air volume displaced at xmax VD 334cm³
• Power handling P 400W
• Program power Pmax 800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.6Ω
• Inductance (1kHz) LE 1mH
• VC Diameter 76.2mm
• Winding height HVC 16mm

Magnet

• Force factor Bl 18N/A
• Motor constant Bl/√RE 7.61N/√W
• Air gap height HAG 8mm

Diaphragm

• Effective diameter 260mm
• Effective area SD 530cm²
• Moving mass MMS 63g
• Moving mass (without air load) MMD 54.3g

Suspensions

• Stiffness KMS 4.39N/mm
• Compliance CMS 228µm/N
• Equivalent volume to the compliance VAS 91L
• Mechanical resistance RMS 3N·s/m

Dimensions

• Nominal diameter 12″
• 300mm
• Overall diameter 313mm
• Baffle cutout diameter 278mm
• Overall depth 131mm
• Volume occupied by the driver (estimated) 2.4L
• Net weight 5.5kg