B&C Speaker 6NDL38

• Sensitivity (1W, 1m, infinite baffle) SPL1W 89.6dB
• Frequency response 70 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 69Hz
• Mechanical quality factor QMS 10.05
• Electrical quality factor QES 0.40
• Total quality factor QTS 0.39

Large signal parameters

• Maximum linear excursion xmax 6mm
• Air volume displaced at xmax VD 79cm³
• Power handling P 150W
• Program power Pmax 300W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.4mH
• VC Diameter 38mm
• Winding height HVC 12mm
• Winding material Copper
• Former material Kapton

Magnet

• Flux density B 1.15T
• Force factor Bl 7.8N/A
• Motor constant Bl/√RE 4.43N/√W
• Air gap height HAG 6mm
• Material Neodymium Ring

Diaphragm

• Effective diameter 130mm
• Effective area SD 132cm²
• Moving mass MMS 18g
• Moving mass (without air load) MMD 16.8g
• Material Waterproof Front Side

Suspensions

• Stiffness KMS 3.4N/mm
• Compliance CMS 294µm/N
• Equivalent volume to the compliance VAS 7.1L
• Mechanical resistance RMS 0.78N·s/m

Dimensions

• Nominal diameter 6.5″
• 170mm
• Overall diameter 187mm
• Baffle cutout diameter 145mm
• Overall depth 85mm
• Flange thickness 11mm
• Mounting depth 74mm
• Volume occupied by the driver 0.63L
• Net weight 1.2kg