SB Acoustics SB23NRXS45-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.7dB

Thiele & Small parameters

• Resonance frequency (free air) fS 27Hz
• Mechanical quality factor QMS 5.55
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Air volume displaced at xmax VD 140cm³
• Power handling P 60W
• Program power Pmax 120W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.3Ω
• Inductance (1kHz) LE 0.29mH
• VC Diameter 45.5mm
• Winding height HVC 19mm
• Winding material Copper Clad Aluminium
• Former material Glass Fiber

Magnet

• Flux density B 0.86T
• Force factor Bl 6.9N/A
• Motor constant Bl/√RE 3.8N/√W
• Air gap height HAG 6mm
• Weight 0.8kg

Diaphragm

• Effective diameter 166mm
• Effective area SD 216cm²
• Moving mass MMS 27.2g
• Moving mass (without air load) MMD 24.9g
• Material Norex

Suspensions

• Stiffness KMS 0.752N/mm
• Compliance CMS 1330µm/N
• Equivalent volume to the compliance VAS 87.5L
• Mechanical resistance RMS 0.8N·s/m
• Surround material Rubber

Dimensions

• Nominal diameter 8″
• 203mm
• Volume occupied by the driver (estimated) 1.1L
• Net weight 2.74kg
• Frame material Cast aluminium