User manual ROLLS RA900

[. . . ] In the absence of such purchase receipt, the warranty period shall be one (1) year from the date of manufacture. This warranty shall be invalid if the product is damaged as a result of defacement, misuse, abuse, neglect, accident, destruction or alteration of the serial number, improper electrical voltages or currents, repair, alteration or maintenance by any person or party other than our own service facility or an authorized Service Center, or any use violative of instructions furnished by us. This one-year warranty is in lieu of all expressed warranties, obligations or liabilities. [. . . ] An ultrasonic network decouples RF from the output and helps keep the amplifier stable with reactive loads. Thank you for your purchase of the ROLLS RA900 Professional Power Amplifier. The RA900 Power Amplifier is a two channel amp with two 410 watt RMS - 4 ohm outputs via 5-way binding posts. It may be bridged and connected to a 4 or 8 ohm load supplying up to 1100 Watts or 850 Watts respectively. The unit is housed in a painted steel chassis and includes a special high performance transformer, and a fused power line. The RA900 is ideal for DJs, musicians, or other sound reinforcement applications such as powering front-of-house speakers or monitors. INSPECTION 1. Unpack and inspect the RA900 box and package. If obvious physical damage is noticed, contact the carrier immediately to make a damage claim. We suggest saving the shipping carton and packing materials for safely transporting the unit in the future. Please complete the Warranty Registration Card and return it to the factory. Table of Contents INTRODUCTION INSTALLATION REAR PANEL STEREO CONNECTION OUTPUTS OPERATING VOLTAGE PROTECT INDICATORS SPECIFICATIONS WARRANTY 1 INSPECTION 1 FRONT PANEL 2 OPERATION 3 BRIDGED 3 INPUTS 3 GROUND LIFT 3 LOW-CUT FILTER 4 5 Back Cover 1 2 3 3 3 3 3/4 INSTALLATION Connect the power cord to an AC power source, connect the input to the signal source and to the RA900 via the XLR or 1/4" input jacks. Turn the Volume controls fully counterclockwise (off), and turn on the power switch, the power LED should light. With the program material running, slowly increase the Volume controls until the desired level of sound is present. There is a two-second turn-on delay provided to prevent possible speaker damage in case all equipment is on a signal power strip. 4 1 DESCRIPTION FRONT PANEL STEREO IN POWER CHANNEL A PROTECT OPERATION IN INPUT BAL BA 1234 CAUTION A MINIMUM LOAD IMPEDANCE 2 OHMS PER CHANNEL 4 OHM BRIDGE AMP MODE FUSE 15A/120V CHANNEL B POWER AMPLIFIER + - B CLIP SIGNAL POWER + 2 0 10 1 3 B INPUT THRU A 0 10 RA900 LOW LOW CUT FILTER 1 4 CUT FILTER ON=30Hz 2 3 ON=30Hz OFF=50Hz OFF=50Hz - BRIDGE MONO + STEREO BRIDGE Channel B Channel A GROUND POWER: Applies power to the RA900 when connected to a properly grounded and powered ac outlet. CHANNEL 1 / 2 LEVEL CONTROLS: Adjust the output level of the indicated channel. When in Bridged mode, Channel 1 control adjusts the output level. POWER LED: Indicates the RA900 is connected to an ac outlet and the power is on. SIGNAL LED: indicates that signal is present in the indicated channel. [. . . ] The DIP switch on the rear panel enables or disables the filter independently for each 3 + 2 1 3 B INPUT THRU A LOW LOW CUT FILTER 1 4 CUT FILTER ON=30Hz 2 3 ON=30Hz OFF=50Hz OFF=50Hz - BRIDGE MONO + STEREO BRIDGE Channel B Channel A GROUND LIFT THRU OUTPUTS GND LFT PWR LOW-CUT SWITCHES: Connects or disconnects the low-cut filters. INPUTS: XLR and 1/4" TRS input jacks. ST/BRDGE SWITCH: Selects either Stereo or Bridged mode. [. . . ]