Boston Acoustics A 250. System type: 2.0 system, Recommended usage: speaker set unit, Speaker placement: Floor. RMS rated power: 175 W, Frequency range: 45 - 25000 Hz, Impedance: 8 Ом. Connectivity technology: Wired, Speaker interface type: Terminal. Width: 320 mm, Depth: 225 mm, Height: 891 mm