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TOUR GRADE SERIES
case of power outage, both output channels are instantly muted then the power amplifier is shut down
within only a few milliseconds.
Mains Circuit Breaker Protection
The power amplifier automatically reduces the output power whenever it is driven at high levels with
extremely low-impedance loads connected, resulting in the chance that the mains circuit breaker reacts.
Therefore, adjusting the characteristics of the utilized circuit breaker in Amperes is possible via the LC
display. Especially at extremely high/low ambient temperatures or when connecting the power amplifier
together with other equipment to a single common automatic circuit breaker, it might become necessary to
manually set an Ampere value that differs from the circuit breaker's nominal value to ensure that the Mains
Circuit Breaker Protection functions optimally. The following table outlines the allowable value ranges and
default settings for the two modes of operation at 120 V and 220-240 V.
The power amp's CPU is acquainted with the temporal progression of the mains current consumption and
therefore can simulate the typical behavior of a mains circuit breaker. Nevertheless, pulse peaks allow
crest currents that can exceed the nominal value by a multiple. RMS measurement of the mains current
consumption allows the CPU to emulate the temperature curve of a circuit breaker's thermal trip, which in
return enables the Mains Circuit Breaker Protection to let the power amplifier work till shortly below the
trigger level of the automatic circuit breaker. With typical concepts, especially for those without RMS
current measurement, output power reduction has to be applied much earlier. During the processing of
musical program material, the Mains Circuit Breaker Protection normally does not have to reduce the
power amp's output power. At most, with settings that are noticeably below the pre-set values of 16 A or
30 A respectively, (which may be reasonable when operating multiple power amps via a single automatic
circuit breaker) output power reduction might become necessary to prevent the mains fuse from blowing.
Power-On Delay and Softstart
A Power-On Delay of up to 6.35 seconds can be programmed for the power amp via the LC display. Upon
pressing the mains switch the power amplifier does not start until the set delay time has elapsed. If several
power amps are operated on the same automatic circuit breaker, cascaded switch-on can be accomplish
by programming individually different power-on delays for the amps. This also prevents the magnetic trip of
an automatic circuit breaker from acting and thus disconnecting the power amplifiers from the mains
supply, when various amps are switched on at the same time. The internal soft-start function additionally
suppresses current peaks during power-on, which ensures trouble-free operation of TOUR GRADE
SERIES amplifiers even on very sensitive automatic circuit breakers.
32
Owner's Manual
Operation
Minimum
120 V
6 A
220-240 V
6 A
Table 3.4: Mains Circuit Breaker Protection
Maximum
Factory Settings
40 A
30 A
30 A
16 A
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