Heat sink with double extrusion, thermally Optimized with die-cast Aluminum Ergonomic Terminal. Rms power 4 Ohm 150Wx4. Rms power 2 Ohm 250Wx4. Active crossover with 12dB/ Oct power Continuous adjustable from 50 to 5K Hz and from 80 to 3.3K Hz, settable AS lo-pass/ high-pass or Full range.