The Denon Audio Technical CD is not a typical music CD. It does not contain any songs or melodies, but rather a series of tones, noises, bursts, sweeps, and announcements. Some of these sounds are recorded at very high levels, so you need to be careful when playing them to avoid damaging your speakers or ears. The disc also uses the emphasis feature, which is a form of pre-emphasis that boosts the high frequencies during recording and reduces them during playback. This was done to improve the signal-to-noise ratio and dynamic range of early CD players, but it is rarely used today.
The Denon Audio Technical CD is divided into four sections: announcement for basic checks, source material for listening tests, test signals for basic checks, and various measurement signals. The announcement for basic checks provides instructions on how to use the disc in English and Japanese. The source material for listening tests consists of short excerpts from different genres of music, such as orchestra, concerto, chamber music, piano, organ, jazz, and rock. These are intended to give you a sense of the sound quality and tonal balance of your system. The test signals for basic checks include sine waves of different frequencies, levels, and phases that can help you check the channel balance, phase alignment, frequency response, distortion, and noise of your system. The various measurement signals include more complex and specific signals that can be used for advanced testing and analysis of your system.
The Denon Audio Technical CD is a rare and valuable item for audiophiles. It was only released in Japan and has been out of print for a long time. It is hard to find a copy of the original disc, which has a catalog number of C39-7147. Some copies have been uploaded online in various formats, such as FLAC or APE. However, these may not preserve the original quality and characteristics of the disc. If you are lucky enough to own or find a copy of the Denon Audio Technical CD, you can use it to test and improve your audio system and enjoy the best sound possible.
References
No Artist Denon Audio Technical CD (1984, CD) - Discogs
Denon Audio Technical CD (FLAC) - Archive.org
Various Artists - Denon Audio Technical CD Album Reviews ... - AllMusic
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