STUDIO 690, Dual 8", 2.5-way compression driver floor standing loudspeaker, Dual 8" (203mm) PolyPlas Low-Frequency Woofer, High Definition Imaging (HDI) Waveguide with 1” (25mm) High Frequency Compression Driver, Recommended Amplifier Power: Max 250W, Frequency Response: 36 Hz - 40 kHz, Sensitivity: 90 dB, Nominal Impedance: 6 Ohms, Enclosure Type: Bass-Reflex via Rear-Firing Tuned Port, Dimensions (W x D x H): 300 x 350 x1058mm, Weight: 29.38 kg