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Operation
Front Panel Controls & Indicators
Input Volume Controls
Each input module may be individually controlled by its corresponding
volume control knob.
Signal / Clip Indicator
A single LED located above each channel’s volume control indicates the
audio activity of that channel’s input. Green indicates signal is being
applied to the mix bus. Red indicates that the input signal coming from
the input module into the amp is clipping and distorted.This is caused by
either an input signal that is too high or an input module volume control
(gain) that is set too high.
Bass and Treble Controls
The treble control has a cut/boost range of +/- 10 dB at frequencies
above 10 kHz and provides a roll off after 20 kHz to reduce gain above
the audio range.
The bass control has a cut/boost range of +/- 10 dB at frequencies below
100 Hz. When driving speakers using the direct-coupled output termi-
nals, the bass filter’s response is constant to 20 Hz.When driving speak-
ers using the transformer-coupled output terminals, the amplifier auto-
matically changes the bass filter’s response to a bandpass shape to reduce
the level of bass frequencies below 40 Hz.This filter shape helps to avoid
overdriving the speaker’s coupling transformer with low frequency sig-
nals that may cause noticeable distortion due to magnetic saturation of
the transformer’s core.
Master Volume Control
The overall volume level of the amplifier is set by a Master Volume con-
trol.The Master Volume control is motorized and can be controlled by
manually adjusting the knob or by a remotely-mounted control station.
Connections and requirements for the remote control station (optional
accessory) are described in the Connections section, under Remote Volume
Control.
Average / Peak Switch & LED Output Meter
The LED Output Meter is an 11-segment meter that registers either the
average or the peak level of the amplifier’s output signal.A red indicator
is provided at the +3 dB level to indicate amplifier clipping.Amber indic-
tors at the 0dB and -3 dB levels indicate high amplifier output levels.The
remaining 8 indicators (green) provide an indication of the output signal’s
dynamics.The meter can be set to read either the average output signal
level or the peak output signal levels by using the Average / Peak Switch
to the left of the meter. In is average; out is peak.
Power Switch / Power Indicator
The AC power to the amplifier is controlled by the Power rocker switch,
which illuminates when power is applied.
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