Eighteen Sound 15NMB1000

• Sensitivity (1W, 1m, infinite baffle) SPL1W 98.4dB
• Frequency response 45 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 46Hz
• Mechanical quality factor QMS 8.30
• Electrical quality factor QES 0.24
• Total quality factor QTS 0.24

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 556cm³
• Power handling P 900W
• Program power Pmax 1800W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 0.89mH
• VC Diameter 100mm

Magnet

• Force factor Bl 25.2N/A
• Motor constant Bl/√RE 10.9N/√W
• Material Neodymium

Diaphragm

• Effective diameter 330mm
• Effective area SD 855cm²
• Moving mass MMS 100g
• Moving mass (without air load) MMD 82.6g

Suspensions

• Stiffness KMS 8.33N/mm
• Compliance CMS 120µm/N
• Equivalent volume to the compliance VAS 124L
• Mechanical resistance RMS 3.48N·s/m

Dimensions

• Nominal diameter 15″
• 387mm
• Overall diameter 387mm
• Baffle cutout diameter 357mm
• Overall depth 174mm
• Flange thickness 20mm
• Mounting depth 154mm
• Volume occupied by the driver (estimated) 3.5L
• Net weight 6.0kg