Filter
Top Products
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 terminals, the bass
filter’s response is constant to 20 Hz.When driving speakers using the trans-
former-coupled output terminals, the amplifier automatically 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 signals 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 control.
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 indictors at
the 0 dB 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.
9