Scan-Speak 21W/8555-10

• Sensitivity (1W, 1m, infinite baffle) SPL1W 86.7dB
• Frequency response 20 - 2500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 20Hz
• Mechanical quality factor QMS 4.50
• Electrical quality factor QES 0.33
• Total quality factor QTS 0.31

Large signal parameters

• Maximum linear excursion xmax 6.5mm
• Maximum excursion before damage xlim 12mm
• Air volume displaced at xmax VD 143cm³
• Power handling P 100W
• Program power Pmax 160W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.5Ω
• Inductance (1kHz, estimated) LE 1.22mH
• VC Diameter 42mm
• Winding height HVC 19mm

Magnet

• Force factor Bl 8.2N/A
• Motor constant Bl/√RE 3.5N/√W
• Air gap height HAG 6mm

Diaphragm

• Effective diameter 167mm
• Effective area SD 220cm²
• Moving mass MMS 32g
• Moving mass (without air load) MMD 29.6g
• Material Paper/Carbon Fibre

Suspensions

• Stiffness KMS 0.505N/mm
• Compliance CMS 1980µm/N
• Equivalent volume to the compliance VAS 134L
• Mechanical resistance RMS 0.89N·s/m
• Surround material SBR Rubber

Dimensions

• Nominal diameter 8″
• 210mm
• Volume occupied by the driver 0.64L
• Net weight 2.2kg
• Frame material Die cast Aluminium