Project21, described elsewhere by Jean-Claude Gaertner, needed a flexible level control system for up to 4 amplifiers actively-driving speakers in at least 2 locations. Cabling having too low a WAF and IR remote control having synchronization issues, the choice fell on RF remote control. In this article Jan Didden describes a small preamp-like control unit with an RF link to two 4-channel level controls integrated in Project21. It describes the level control circuitry, control concept and implementation. The article concludes with a universal 2/4/8 channel level board that can be used to control multi-channel levels in multiple locations using the same system components.
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