BIC Venturi V52 Bookshelf Speakers for Home Theater Surround Sound USA Excellent Condition. Heavy duty speakers weighing approx. With a 4-1/2-inch woofer and a 1-inch dome tweeter in a cabinet measuring 7 inches wide, 11-3/4 inches high, and 7-1/4 inches deep. Presumably to reduce diffraction problems, the side edges of the cabinets are beveled. Nominal system impedance is 8 ohms; sensitivity is given as 90 dB sound-pressure level (SPL) with a 1-watt input.