SB Acoustics SB12NRX25-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.6dB

Thiele & Small parameters

• Resonance frequency (free air) fS 57Hz
• Mechanical quality factor QMS 4.10
• Electrical quality factor QES 0.41
• Total quality factor QTS 0.37

Large signal parameters

• Maximum linear excursion xmax 5mm
• Air volume displaced at xmax VD 25cm³
• Power handling P 30W
• Program power Pmax 60W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 6.4Ω
• Inductance (1kHz) LE 0.34mH
• VC Diameter 25.4mm
• Winding height HVC 15mm
• Winding material Copper Clad Aluminium
• Former material Glass Fiber

Magnet

• Flux density B 1.07T
• Force factor Bl 5.4N/A
• Motor constant Bl/√RE 2.13N/√W
• Air gap height HAG 5mm
• Weight 0.4kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 5.2g
• Moving mass (without air load) MMD 4.9g
• Material Norex

Suspensions

• Stiffness KMS 0.671N/mm
• Compliance CMS 1490µm/N
• Equivalent volume to the compliance VAS 5.3L
• Mechanical resistance RMS 0.45N·s/m
• Surround material Butyl rubber

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.36L
• Net weight 0.92kg
• Frame material Cast aluminium