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PowerH SERIES
Owner’s Manual 15
MODE
The MODE switch on the power amp’s rear panel defines the operation mode of the power amplifier blocks
and thus, how a single or more speaker systems have to be connected.
NORMAL
In two-channel operation (NORMAL), both power amplifier blocks work as independent power amp
channels and controlling the amplification of each channel separately is possible. How the power amp’s
audio inputs handle input signals depends only on the setting of the ROUTING switch.
BRIDGED
In BRIDGED mode, the power amplifier functions as single-channel, monaural power amp. If the switch is
set to DUAL (input channels work independent from each other), the audio signal has to be applied to
either one of the input connectors (XLR or Phoenix) of channel A while channel B inputs are inactive. With
the switch being set to PARALLEL, the audio signal may be fed to either one of the inputs of channel A or
of channel B. In BRIDGED mode, the power amp channel A is modulated as usual.In addition, the input
signal is internally inverted and applied to channel B. The A and B power amps act in push-pull operation
delivering doubled output voltage.
SENSITIVITY/GAIN
PowerH SERIES amplifiers can be operated at an input sensitivity of 0dBu as well as at a constant
gain of 35dB or 32dB. A correspondingly labeled LED on the power amp’s front panel indicates the
respective setting of the sensitivity/gain switch, which is located on the power amp’s rear panel.
An Input sensitivity of 0dBu means that with an input signal of 0 dBu (0.775 Vrms), the signal at the power
amplifier outputs is at Rated Output Power. This setting is recommended for audio signal sources that
deliver a nominal output voltage of 0 dBu. As an alternative, operating the power amp at a constant gain of
35 dB or 32 dB is also possible. Operating all power amps in a setup – even those of different performance
classes – at constant gain setting greatly simplifies the adjustment of signal processors. This allows the
Illustration 2.9: BRIDGED mode
CAUTION:
In BRIDGED mode operation, it is not allowable for the load connected to fall below a va-
lue of 4 ohms. Extremely high voltages can be present at the output. The connected
speaker systems must be able to handle such voltages. Make sure to completely read
and fully observe power rating specifications of the speaker systems to be used and to
check them against the output power capacity of the power amp.
NOTE:
If a remote control module is used the sensitivity/gain switch is deactivated and the sen-
sitivity/gain of the amplfier is automatically set to 35 dB.