This sixth iteration of the Gold Series brings with it several cutting-edge technologies. First and foremost is the proprietary metal-cone design of the 3″ midrange and 6″ bass drivers, which Monitor Audio calls Hexagonal Diaphragm Technology (HDT). HDT builds on the Rigid Diaphragm Technology (RDT III) incorporated in the Hyphn and the Platinum Series 3G loudspeakers: a Nomex honeycomb core sandwiched between aluminium and carbon-fiber skins. The HDT cone is formed of low mass single-skin Ceramic-Coated Aluminium-Magnesium (C-CAM), which is highly resistant to deformation. The rigidity of the cone is increased by a pattern of hexagonal surface indentations, which disrupts symmetries in the cone breakup.
The Gold 300 6G floorstander is a slender three-way bass-reflex design with two rear ports. As mentioned, it employs an MPD III tweeter, a 3″ HDT midrange driver, and twin 6″ HDT bass drivers.The Gold 300 6G has a specified frequency response of 45Hz–60kHz (−6dB, free field) or 28Hz–60kHz (in-room). It has a nominal 4-ohm impedance and a sensitivity of 87dB/2.83V/1m (free field). Continuous power handling is rated at 250W, and the recommended amplifier power is 130W–500W (RMS).