Product Description HDI-3600 Highlights Patented HDI™ (High-Definition Imaging) waveguide technology Patented 2410H-2 high-frequency compression driver 6.5-inch (165mm) cast frame, Advanced Aluminum Matrix cone woofers with 1.5-inch voice coils Contemporary design with premium finishes including high-gloss Black, satin Gray Oak wood veneer, and satin Walnut wood veneer General Specifications Enclosure Type: Bass-reflex design with rear-firing port High Frequency Transducer: 1-inch (25mm) Teonex compression driver Low / Mid Frequency Transducers: Three 6.5-inch (200mm) black Advanced Aluminum Matrix cone, cast frame woofers Crossover Frequency: 900Hz, 2000Hz Sensitivity (2.83V @ 1M): 90dB Nominal Impedance: 4 Ohm Recommended Amplifier Power: 20W – 250W Frequency Response: 38Hz – 30kHz (-6dB) Dimensions (H x W x D): 38.84 x 10.04 x 13.46” (986.5 x 255 x 341.9mm) Net Weight: 61.80 lbs (28.03kg)