All rights reserved. Reproduction in whole or in part is prohibited. “RA150/300/500” and “Reference Series” are trademarks of Alesis Studio Electronics, Inc. ALESIS CONTACT INFORMATION Alesis Studio Electronics, Inc. 1633 26th Street Santa Monica, CA 90404 USA Do not use this address for repair service. Telephone: 800-5-ALESIS (800-525-3747) E-Mail: support@alesis.com Website: CONTENTS Introduction......................................................2 How to Use This Manual.....................

Use a small tool or pen to change the setting of this switch only if it is set to the wrong value for the country the amplifier will be used in. When changing voltages the fuse must be changed to the correct rating as shown on page 10. STEREO/BRIDGED MONO SWITCH Underneath the right input jack, this switch converts the RA150/300/500 from its normal operation as a two-channel amplifier to operation as a single-channel amplifier with approximately twice the power. Make sure this switch is set prop

• Prevent the side heat sink fins from becoming obstructed. There should be enough airspace around the amplifier for it to “breathe.” • Always allow adequate ventilation behind the RA150/300/500. Do not seal any enclosure that holds the RA150/300/500. • Never throw a coat or other flexible fabric or covering over the top of the amp when it’s in use. • You may wish to leave an empty rack space above or below the amp to promote good air flow. If multiple amplifiers are mounted in the same rack, th

The wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. 10. Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus. 11. Use only attachments or accessories specified by the manufacturer. 12. Use only with a cart, stand, bracket, or table designed for use with professional audi