CONVERT AN ETC SOURCE FOUR SPOTLIGHT INTO A SCENIC PROJECTOR OR GOBO CHANGER! The GAM SX4 ® system offers a choice of four Trays that snap into an ETC Source Four. The Loop Tray allows the use of over 30 GAM pattern loops for scenic projection. The Six-Gobo Tray uses any "M" size gobo from the more than 800 patterns available in GAM's catalog. The Disc Tray uses an 8.5 inch Effect Disc. The SX4 ® is fully modular, so that your Source Four can revert to a conventional ellipsoidal quickly and easily when needed. GAM can also supply a 575 watt HMI Source Four, offering three times the light output. Built with the rugged demands of the theme park, retail and architectural markets in mind, the GAM SX4 ® offers amazing dependability and many options with hundreds of off-the-shelf effects as well as custom designs. Four-Gobo Tray: Similar to Six-Gobo Tray, but for 'B' Size patterns.