User manual QSC AUDIO PLX 2502 REV E

[. . . ] 9- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding plug has two blades and a grounding prong. The wide blade or third prong are provided for your safety. [. . . ] Bridge Mode: This setting combines both channels into a single channel with twice the output voltage. Use only Channel 1's input and Gain control. Set Channel 2's Gain control at minimum. Use only one input when operating in parallel or bridge mode. Low Frequency filter selection switches for each channel Clip Limiter ON/OFF switch Input Configuration selector switch Clip Limiters (PLX 1802/2502/3102/3602 models only) The amplifier has a clip limiter with an on-off switch. The limiter only responds to actual clipping, and automatically compensates for load and voltage variations. Clip limiting is generally recommended, especially to protect high frequency drivers. ·Set the switch UP (ON position) to use Clip Limiting. ·Set the switch DOWN (OFF position) to disable the clip limiter. Low Frequency Filters (PLX 1802/2502/3102/3602 models only) Each channel has independent filter selection of Full Range (infrasonic filter only), 33 Hz low cut, 100 Hz low cut, or 100 Hz High Cut. This allows tailoring the amplifier performance to that of the loudspeakers, offering the best possible performance from the system. Proper filtering reduces distortion and prevents amplifier overload. TOP / FULL / SUB Switch: Select the type of loudspeaker being driven by each channel. ·Set the switch to the left for driving "top" boxes; applies 100 Hz low cut ·Set the switch to the middle position for "full range" loudspeakers. Carefully note the markings and maintain consistent loudspeaker polarity for optimum system performance. PLX 1104 and PLX 1804 Output Connectors: Do not use less than 4 ohm impedance loads with PLX 1104 and PLX 1804 models. Speakon Output Connectors If making Speakon cables, be sure to connect the loudspeaker wiring as shown on the chassis. Channel 1's Speakon provides 4-wire (Ch 1 + Ch 2) connection; Channel 2's Speakon provides 2-wire (Ch 2 only) connection. Appendix A provides Speakon connection reference. Stereo and Parallel Mode: Connect each loudspeaker to its own channel of the amplifier, as shown on the chassis label. The INPUT CONFIGURATION switch must be set for STEREO or PARALLEL mode. Bridge Mode (PLX1802/2502/3102/3602 models only): Use Channel 1's Speakon for Bridge mode output connection. Bridge mode configures the channel pair to drive a single high-power loudspeaker load. The INPUT CONFIGURATION switch must be set for BRIDGE mode. Use only Channel 1's input and Gain control. Set Channel 2's Gain control at minimum. PLX 1802, PLX 2502, PLX 3102, and PLX 3602 Output Connectors: Do not use less than 2 ohm impedance loads with these models. Binding Post Connectors (PLX 1802/2502/3102/3602 models only) Stereo and Parallel Mode: Connect each loudspeaker to its own channel of the amplifier, as shown on the chassis label. The INPUT CONFIGURATION switch must be set for STEREO or PARALLEL mode. [. . . ] ·Overdrive distortion will cause the red Clip LED to flash. If driven constantly into clipping, internal circuitry smoothly reduces the volume to minimize distortion and stress. ·These models are rated for 4-ohm loads. Do not use more than two 8-ohm speakers per channel. [. . . ]