The WM-D6C can easily be identified from the earlier WM-D6 version because the “professional” script on the top cover is green instead of yellow. The level meter was also altered so that as well as showing the recording level or the battery condition, it could be switched off to save battery power. This was a great improvement and helped to reduce the background noise level when recordings were made from line sources, such as a CD player, second tape recorder or a mixing desk. Most useful of these was the addition of a line-in connector, which allowed direct connection to other audio equipment without having to use the microphone socket. Other useful modifications were made at the same time. The fact that this extra function could be fitted to the WM-D6 without making it any larger was amazing, though it forced some changes, for example the second headphone socket was no longer fitted. Including Dolby C noise reduction in a compact portable was not easy, and the integrated circuits which performed most of the functions had to be made by Sony themselves. This system, which operated in playback and record, improved the dynamic range considerably. This updated model added to the strengths of the WM-D6 by offering an important extra feature: Dolby C noise reduction.
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