Scan-Speak Revelator 28W/4878T01

• Sensitivity (1W, 1m, infinite baffle) SPL1W 88.4dB
• Frequency response 23 - 1000Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 23Hz
• Mechanical quality factor QMS 6.21
• Electrical quality factor QES 0.27
• Total quality factor QTS 0.26

Large signal parameters

• Maximum linear excursion xmax 7mm
• Maximum excursion before damage xlim 28mm
• Air volume displaced at xmax VD 254cm³
• Power handling P 200W
• Program power Pmax 500W

Voice Coil

• Nominal impedance Z 4Ω
• DC resistance RE 3.1Ω
• Inductance (1kHz, estimated) LE 1.33mH
• VC Diameter 75mm
• Winding height HVC 22mm
• Former material Titanium

Magnet

• Force factor Bl 12N/A
• Motor constant Bl/√RE 6.82N/√W
• Air gap height HAG 8mm

Diaphragm

• Effective diameter 215mm
• Effective area SD 363cm²
• Moving mass MMS 86g
• Moving mass (without air load) MMD 80.8g
• Material Paper sandwich

Suspensions

• Stiffness KMS 1.79N/mm
• Compliance CMS 560µm/N
• Equivalent volume to the compliance VAS 104L
• Mechanical resistance RMS 2N·s/m

Dimensions

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