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FRONT PANEL
1. Input "A" and "B" level controls
These controls are normally set to their "0"-marked (detent) center position.
If needed or desired, the controls can be used to individually adjust the input levels of the channels "A"
and "B". The green "Signal" LEDs indicate that audio signals are present at the inputs. The red "Peak"
LEDs light whenever the audio signal is clipped inside the AC
which might result in distortion. In case
ONE
the "Peak" LEDs light continuously, lowering of the input levels is recommended to maintain the entire
dynamic range.
2. Lo-Cut filter control
This control is normally set to its center (50Hz) position.
The filter is used to eliminate unwanted low-frequency noise.
3. Lo-EQ control
This control is normally set to its center (6dB) position and it is used to correct the frequency response of
the sub woofer systems. When the control is set to its clockwise margin, low bass frequencies are amplified
by +12dB. The audio signal stays unaltered when the control is positioned at its counter-clockwise margin.
4. Mid-EQ control
This control is normally set to its center (-4dB) position.
It is used to increase the audio level in the 4kHz range. Setting the control to its clockwise margin results
in no change in the frequency response but delivers the farthest coverage of the sound reinforcement
system. Setting the control to its counter-clockwise margin provides pleasant audio even in the near field
of the loudspeaker systems.
5. Hi-EQ control
This control is normally set to its center (4dB) position.
The control is used to increase the audio signal's high frequency range which allows to accomplish
improved intelligibility and brilliance even when using loudspeaker systems with diminished treble
characteristics. Setting the control to its counter-clockwise margin leaves the high frequency response
unaltered.
6. X-over frequency control
The control is normally set to its center (100Hz) position.
This sets the crossover frequency between sub woofer (LO OUT) and full-range cabinets (HI OUT) to
100Hz. Reproduction of the fundamental frequencies of the vocals is mainly taken care of by the full-range
cabinets. Best results in coverage and vocal dynamic are achieved when shifting the crossover frequency
to approximately 140Hz; a setting that gets widely used in live music sound reinforcement applications.
Setting the crossover point at approximately 70Hz results in optimally locatable vocals and average
coverage. This setting is often used when reproducing CDs or other pre-recorded audio programs.With
the PowerMax12 x-over function, setting the crossover frequency is extremely uncritical. Often enough,
when the system is operated at medium sound pressure levels, changes are not registered. Only when
operating the reinforcement system at extremely high levels and depending on the actual setting of the
crossover frequency, minor differences in the subjective peak dynamic of the low frequency range and in
the coverage of mid frequency band can be heard.
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