STUDIO 680 Dual 6.5", 2.5-way Compression Driver Floor Standing Loudspeaker, Dual 6.5" (165mm) PolyPlas Low-Frequency Woofer,High Definition Imaging (HDI) Waveguide with 1” (25mm) High Frequency Compression Driver, Recommended Amplifier Power: Max 200W, Frequency Response: 38 Hz - 40 kHz, Sensitivity: 88dB, Nominal Impedance: 6 Ohms, Enclosure Type: Bass-Reflex via Rear-Firing Tuned Port, Dimensions (W x D x H): 230 x 300 x 1005 mm, Weight: 22.64 kg