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| HDCD - High Definition Compatible Digital, sometimes referred to as High Definition/Density Compact Disc. A type of digital encoding and decoding technology used for some audio CD's for improved sound. You need a CD player with HDCD technology to benefit from the improvements. The name "Compatible Digital" is used due to copyright restrictions when using the "Compact Disc" title. | |
| Hz (HERTZ) - A unit of Frequency. A sound wave of 1Hz has a Cycle time of 1 second. See Frequency above. | |
| HORN LOADING - Uses trumpet style horns within a speaker to increase the output level at a lower, more efficient input level. |