Alesis RA150 User Manual - Page 28
Amplifier input clipping
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Operation: Chapter 3 Amplifier input clipping On the other hand, the maximum level at the amplifier's input terminals is +26 dBu, regardless of the setting of the channel input level controls. It is possible that the output signal from the source may be too high and, thus, distorted before it reaches the amplifier gain control, either because the source device is clipping or the amplifier input stage is overloaded. In either case, no amount of level control adjustment at the amplifier can remove this distortion, and you should lower the output level of the device feeding the amplifier until the distortion stops. OUTPUT RELAYS/THERMAL CYCLING Reference Series amplifiers have high-current output protection relays which disconnect the output in the event of overheating, DC offset, audio signals below 5 Hz on the output terminals or excessively low line voltage. When this happens in the RA300/500, the PROTECT indicators of both channels will glow. Additional protection circuitry keeps RFI out of the audio circuits, assuring clean, stable operation in difficult environmental conditions. If the unit shuts off, turn off the power and check for problems with the wiring, input level, or ventilation of the amplifier. Continued high-temperature operation may also trigger an internal thermal fuse, which will shut the unit off entirely until it has cooled off. In this case, the PROTECT indicators and POWER indicators will turn off as well. Overheating is the most common cause of amplifier shutdown. You must ensure that the heat sinks of the amplifier are not blocked and can receive a supply of cooler air. 26 RA150/300/500 Reference Manual