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http://www.roundsound.com/reference-3-speakers.htm
Frequency Response: 34Hz - 35kHz +/- 3dB
Frequency Response
(active bass): 22Hz - 35kHz +/- 3dB
Impedance top terminal : 4 - 8 ohms
Impedance lower terminal: 4 ohms
Sensitivity: 88 dB/1 watt/1 meter
Power Handling: 350 watts RMS
Driver: Dual 4" carbon fiber midrange drivers
Custom 10" dual voice coil bass driver
CDT Tweeter: 300° dispersion 3kHz - 35kHz
Midrange Driver Material: Hyperbolic carbon fiber
Dimensions: 36.25" (H) x 8" (W) x 14" (D) with grill
35.5" (H) x 8" (W) x 14" (D) w/out grill
Add 2 to 2.25" for spikes and spike protectors
Weight: 47 lbs each
Connections: Gold plated brass binding posts for secure wire connection
Enclosure: Aluminum/Stainless Steel
Finishes: Black on black or black on stainless with black base (Cherry or Natural Maple bases available as optional upgrade)
Warranty: 1 year parts and labor (expanded to 5 years if product is registered within 60 days of purchase)