Eighteen Sound 10NMB420

• Sensitivity (1W, 1m, infinite baffle) SPL1W 97.2dB
• Frequency response 65 - 5000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 56Hz
• Mechanical quality factor QMS 5.00
• Electrical quality factor QES 0.26
• Total quality factor QTS 0.25

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 138cm³
• Power handling P 350W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.0Ω
• Inductance (1kHz) LE 0.37mH
• VC Diameter 65mm
• Winding material Aluminum

Magnet

• Force factor Bl 14.5N/A
• Motor constant Bl/√RE 6.48N/√W

Diaphragm

• Effective diameter 210mm
• Effective area SD 346cm²
• Moving mass MMS 29.5g
• Moving mass (without air load) MMD 24.8g

Suspensions

• Stiffness KMS 3.65N/mm
• Compliance CMS 274µm/N
• Equivalent volume to the compliance VAS 40L
• Mechanical resistance RMS 2.08N·s/m

Dimensions

• Nominal diameter 10″
• 260mm
• Overall diameter 260mm
• Baffle cutout diameter 232mm
• Overall depth 122mm
• Flange thickness 11mm
• Mounting depth 111mm
• Volume occupied by the driver (estimated) 1.4L
• Net weight 3.0kg