755 EX driver is a faithful reproduction of the 755a in every way but two: Its nominal impedance is 8 instead of 4 ohms, and, instead of a permanent magnet, the Line Magnetic 755 EX uses a field coil
The 755 I's aperiodic enclosure is constructed entirely of plywood, the heaviest panel being a central baffle that's rigidly fastened to the inside front. Within the cabinet is an extra pair of sidewalls, positioned to leave narrow gaps between them and the outer panels; on each side, those gaps are open to the larger volume of air inside the cabinet through only a single small vent, and to the outside of the cabinet through a trio of narrow vents. The inner surfaces of all panels except the front are lightly damped with thin, woolly pads.
Originally Posted by wws944
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