Focal AUDITOR RSB 250

• Sensitivity (1W, 1m, infinite baffle) SPL1W 84.3dB
• Frequency response 35 - 500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 29Hz
• Mechanical quality factor QMS 4.70
• Electrical quality factor QES 0.68
• Total quality factor QTS 0.59

Large signal parameters

• Power handling P 250W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 2 x 4Ω
• DC resistance (in series) RE 6.4Ω
• Inductance (1kHz, in series, estimated) LE 2.9mH
• VC Diameter 50mm

Magnet

• Force factor (in series) Bl 13.4N/A
• Motor constant Bl/√RE 5.3N/√W
• Diameter 140mm

Diaphragm

• Effective diameter 198mm
• Effective area SD 307cm²
• Moving mass MMS 93g
• Moving mass (without air load) MMD 88.8g
• Material Polypropylene

Suspensions

• Stiffness KMS 3.33N/mm
• Compliance CMS 300µm/N
• Equivalent volume to the compliance VAS 42L
• Mechanical resistance RMS 3.61N·s/m
• Surround material Butyl

Dimensions

• Nominal diameter 10″
• 271mm
• Overall diameter 271mm
• Baffle cutout diameter 233mm
• Mounting depth 117mm
• Volume occupied by the driver (estimated) 1.4L
• Net weight 3.4kg