Scanspeak 28W/4878T00 Revelator Subwoofer with sandwich cone.
An extremely powerful 11 inch / 28cm subwoofer featuring a large 3” voice coil, a huge maximum excursion of 52mm and a low resonance frequency of just 18 Hz ; it reproduces the deepest, loudest bass frequencies with ease and accuracy.
The patented foam filled paper-sandwich cone has a very high stiffness to weight ratio.
Copper Faraday sleeves control eddy currents within the motor. Rugged heavy duty alloy chassis.