SB Acoustics SB12NRXF25-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.3dB

Thiele & Small parameters

• Resonance frequency (free air) fS 61Hz
• Mechanical quality factor QMS 5.30
• Electrical quality factor QES 0.53
• Total quality factor QTS 0.48

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 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz) LE 0.27mH
• VC Diameter 25.4mm
• Winding height HVC 15mm

Magnet

• Flux density B 0.84T
• Force factor Bl 3.6N/A
• Motor constant Bl/√RE 2.04N/√W
• Air gap height HAG 5mm
• Weight 0.32kg

Diaphragm

• Effective diameter 80mm
• Effective area SD 50cm²
• Moving mass MMS 5.8g
• Moving mass (without air load) MMD 5.5g

Suspensions

• Stiffness KMS 0.855N/mm
• Compliance CMS 1170µm/N
• Equivalent volume to the compliance VAS 4.1L
• Mechanical resistance RMS 0.42N·s/m

Dimensions

• Nominal diameter 4″
• 102mm
• Volume occupied by the driver (estimated) 0.29L
• Net weight 0.75kg