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The precise adjustment of the delays is achieved by selecting the corresponding fader by clicking on it
with the mouse, and then using the cursor left and right keys on your computer keyboard. This method
allows adjustment in steps of 0.7 cm. You can also adjust the temperature in the same way as in the
input delay window.
The three Link selection fields allow the linking of adjacent output delays.
On returning to the main screen, the delay time value you have entered will appear below the
corresponding delay button in the signal path. Each output can be adjusted with up to 30 milliseconds
delay (10.30 meters at 20ºC).
3.7. Input EQ - Global Equalization
Following the input delays in the input path are the Input EQ Icons. EQUA (input A), EQUB (input B)
and EQUM (Mono M), are shown in red, blue and green colour respectively in order to differentiate
them.
On pressing any of these buttons the Global Input EQ window will appear. In this window you are able
to configure the global equalization to each input.
The lower part of the window shows the frequency response curve. EQ curves that are activated in the
View boxes (EQ display) will appear as a curve, each one in its own colour (EQUA in red, EQUB in
blue and EQUM in green). 6 totally configurable filters are available for each input.
Filters can be modified or edited in the following manner:
- In the section Modify, select the EQ to be edited and ensure that the corresponding View option is
activated.
- A square marker will appear on the equalization curve corresponding to the selected frequency,
together with a figure corresponding to one of the 6 filters selected for editing. By default, all filters are
set at Bypass with a gain of 0dB and 1000 Hz centre frequency.
- After selecting the filter to be adjusted, the type of filter required can be selected. Open the list Type
of Filter to see the following options:
Bypass
Filter not activated.
Parametric filter allowing adjustment of boost or attenuation, the centre
frequency and the quality factor Q.
Parametric
The value of Q is defined as being: the centre frequency divided by the
difference between the upper and the lower frequencies at –3dB (band-width).
Shelving filter to attenuate or emphasise low frequencies by a 6dB/oct.
Shelv Low 6dB
increase.
Shelving filter to attenuate or emphasise low frequencies by a 12dB/oct.
Shelv Low 12dB
increase.
Shelving filter to attenuate or emphasise high frequencies by a 6dB/oct.
Shelv High 6dB
increase.
Shelving filter to attenuate or emphasise high frequencies by a 12dB/oct.
Shelv High 12dB
increase.
Second order low-pass filter of Butterworth type.
LowPass
HiPass
Second order high-pass filter of Butterworth type.
BandPass
Bandpass filter with adjustable frequency, Q and gain.
StopBand
Reject-band filter with adjustable frequency and Q.
Allpass 1
First order All-pass. 90º phase shift at the selected frequency.
Second order All-pass filter. 180º shift at the selected frequency with phase
Allpass 2
change controlled by the Q value.
- Choosing a filter type automatically activates the available parameters for Frequency, Gain and Q.
All parameters can be edited from the keyboard by entering numerical data, confirming them by
pressing Enter, cursor up and down or exiting the control panel.
- It is also possible to modify the values for Frequency and Gain with the mouse: This is achieved by
placing the mouse near the filter mark in the graphic display until the mouse pointer becomes a hand.
Click and drag without releasing the mouse button in order to move the filter value to the required
position.
RAM Audio LMS244 Digital Controller
9
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