Eighteen Sound 21NTLW5000

• Sensitivity (1W, 1m, infinite baffle) SPL1W 95dB
• Frequency response 30 - 1800Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 30Hz
• Mechanical quality factor QMS 12.30
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.32

Large signal parameters

• Maximum linear excursion xmax 17.5mm
• Air volume displaced at xmax VD 2909cm³
• Power handling P 1800W
• Program power Pmax 4000W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.0Ω
• Inductance (1kHz) LE 1.3mH
• VC Diameter 115mm
• Winding height HVC 42.5mm
• Winding material Aluminum

Magnet

• Force factor Bl 25N/A
• Motor constant Bl/√RE 14.4N/√W
• Air gap height HAG 15mm

Diaphragm

• Effective diameter 460mm
• Effective area SD 1662cm²
• Moving mass MMS 372g
• Moving mass (without air load) MMD 325g
• Material Water,UV repellent

Suspensions

• Stiffness KMS 13.2N/mm
• Compliance CMS 76µm/N
• Equivalent volume to the compliance VAS 300L
• Mechanical resistance RMS 5.7N·s/m

Dimensions

• Nominal diameter 21″
• 533mm
• Overall diameter 545mm
• Baffle cutout diameter 492mm
• Overall depth 320mm
• Flange thickness 18mm
• Mounting depth 302mm
• Volume occupied by the driver (estimated) 10L
• Net weight 12.5kg