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Operation: Chapter 3
26 RA150/300/500 Reference Manual
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.