Scan-Speak Revelator 28W/4878T00

• Sensitivity (1W, 1m, infinite baffle) SPL1W 85.4dB
• Frequency response 18 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 18Hz
• Mechanical quality factor QMS 5.60
• Electrical quality factor QES 0.32
• Total quality factor QTS 0.30

Large signal parameters

• Maximum linear excursion xmax 14mm
• Maximum excursion before damage xlim 26mm
• Air volume displaced at xmax VD 508cm³
• Power handling P 200W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz, estimated) LE 0.77mH
• VC Diameter 75mm
• Winding height HVC 36mm
• Former material Titanium

Magnet

• Force factor Bl 11.2N/A
• Motor constant Bl/√RE 6.36N/√W
• Air gap height HAG 8mm

Diaphragm

• Effective diameter 215mm
• Effective area SD 363cm²
• Moving mass MMS 115g
• Moving mass (without air load) MMD 109g
• Material Paper sandwich

Suspensions

• Stiffness KMS 1.47N/mm
• Compliance CMS 680µm/N
• Equivalent volume to the compliance VAS 127L
• Mechanical resistance RMS 2.3N·s/m

Dimensions

• Nominal diameter 12″
• 280mm
• Volume occupied by the driver 2.23L
• Net weight 7.5kg
• Frame material Die cast Aluminium