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The Tuning Tools of the GUI
You will use the EQ graph and the Function bar above for making the EQ adjustments.
Below we lay out the EQ tuning functions.
1. GEQ: There are two types of Equalizers in the DSP-Z8 IV AT GUI. The early EQs were
Graphic EQs. Each band had an assigned frequency and an assigned Q factor. Q determines
the shape to the filter. A low Q gives a wide adjustment and a high Q gives a narrow
sharper adjustment. In most early EQs your only adjust was the level of boost or cut that
was made with the filter band while some had adjustable Q.
2. PEQ: More popular today is the Parametric Equalizer or PEQ. The parametric EQ allows
you to put the filter at any frequency that needs attention, so any filter can be at any
frequency. It also allows you to determine the Q of the filter, so you can boost or cut a
large group of frequencies, or you can pinpoint only a few frequencies to be affected.
By watching the RTA while you are making adjustments you will see how wide or narrow
the adjustment needs to be and you can adjust the Q accordingly.
3. Reset: Occasionally you may decide you don’t like what you’ve done to a channel. The
reset button allows you to reset all the filters of a channel to 0 dB.
4. Bypass: The bypass button lets you temporarily bypass the EQ of a channel to hear the
channel with and without equalization for A/B comparisons.
5. EQ: This is the EQ band box. You can which of the 31 EQ bands you will adjust by
clicking on any of the green band buttons and using drag-n-drop, but you can also click
into the EQ band box and type in a band number or use the up/down arrows of the
keyboard to scroll through the bands.
6. Fr: Similarly, the Fr: box lets you change the frequency of a band. If you have made an
adjustment and the frequency is not quite right, you can click into the Fr: box and move
the center frequency up or down with the up/down arrows.
7. Level: As we said before, you can drag-n-drop a band button to make EQ adjustments,
but they will be rough adjustments. If you click into the Level box, you can make fine
adjustments .5 dB at a time using the keyboard arrows.
8. Q: Clicking into the Q box lets you change the shape of the filter using the keyboard
arrows. While watching the RTA you can see exactly what your changes are doing to the
acoustic response as you make the fine adjustments.
9. EQ Link buttons: The first Equalization should always be done by R/L channel pairs. To
do this you use the EQ Link buttons. Example: Click Ch1 in the CH OUTPUTS column to
open Ch1. The Ch1 button 1 will be highlighted and the Ch1 row will be bright. Now you
can click 2 and Ch2 will become bright as well to let you know than Ch1 and Ch2 are
linked. The next time you click any channel in the CH OUTPUTS column the link will be
broken. Notes: a. You should only link 2 channels at a time b. After the first equalization
you can modify one channel or the other and then re-link them for further adjustment,
but this should only be done by experienced tuners. 99% of all installation will have the
best results by paired channel equalization c. It is possible to link all the channels except
the Subs. The subs can only be linked to each other. This linking again however should
only be used by experienced tuners.
10. Trace buttons: You will always see the EQ and Crossover traces of the active channel
being worked on. The color-coded buttons at the left allow you to include other traces in
the graph so you can see how they interact.
11. The EQ graph will always show all the available bands for the active channel as the
green band buttons. Before any adjustments they are all on the 0 dB. After adjustment
the buttons will in their position on the response curve (the trace) you have set with your
adjustments.
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