SB Acoustics SB65WBAC25-4

• Sensitivity (1W, 1m, infinite baffle) SPL1W 81.4dB

Thiele & Small parameters

• Resonance frequency (free air) fS 115Hz
• Mechanical quality factor QMS 6.00
• Electrical quality factor QES 0.77
• Total quality factor QTS 0.68

Large signal parameters

• Maximum linear excursion xmax 2.7mm
• Air volume displaced at xmax VD 5.3cm³
• Power handling P 20W
• Program power Pmax 40W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.6Ω
• Inductance (1kHz) LE 0.15mH
• VC Diameter 25.4mm
• Winding height HVC 8.3mm

Magnet

• Flux density B 1.02T
• Force factor Bl 2.9N/A
• Motor constant Bl/√RE 1.53N/√W
• Air gap height HAG 3mm
• Weight 0.02kg
• Material Neodymium

Diaphragm

• Effective diameter 50mm
• Effective area SD 20cm²
• Moving mass MMS 2.5g
• Moving mass (without air load) MMD 2.4g
• Material Aluminium

Suspensions

• Stiffness KMS 1.3N/mm
• Compliance CMS 770µm/N
• Equivalent volume to the compliance VAS 0.43L
• Mechanical resistance RMS 0.3N·s/m

Dimensions

• Nominal diameter 2.5″
• 64mm
• Net weight 0.14kg