Dawn Pro Audio AMS-DAWN-T50 50W Tower Mixer/Speaker Woofers: Two 4.5-inch, 50w, 4 Ohm Each 20mm Titanium dome tweeter for smooth high-end Built-in 3-channel mixer Frequency response: 65Hz - 20kHz (full range); crossover: 150Hz - 20kHz (active with subwoofer) Balanced input for linking up to four T50 units (sold individually)