Yorkville (or Traynor, if you will) used RCF speakers in their "Elite" line of PA equipment back in the mid to late 80's. They were extremely reliable, and most music stores used them in their Rental Departments with great success.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.