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To set this curve as a multiplier, press the F5 key. In this dialog box, select
the file you just saved (Average_resp) and, under 'Compensation of
Level', check the 'Tune EQ (multiply)' box as shown (figure 26). This
curve is now the reference and all subsequent measurements will be
multiplied by this response.
Click OK. The graphs will change, but ignore these changes.
We now need to set division by the measurement performed in this last
position with no equalisation (R
Press Ctrl + F and make sure this last measurement is selected as shown
in figure 27 (in this example #10 was the last measurement position and
that is therefore set as reference).
Click OK.
The graphs will change, but ignore these changes.
R neq .R m
When we now perform another measurement with the equalisation
R meq
=
R n
applied (R
), the software will calculate the quantity:
neq
In our case the original measurement at position #10 is R
Now it is time to clean up the display. Make sure the following button is
turned off:
To remove the measurements we used to make the reference, click the
erase button
and select the settings shown in figure 28 (this will
remove all the curves in the plot and remove the measurements from
memory).
There will now be no plots showing on the screen. Make sure the
Overlay button
is in the down state.
Click
(or press the F2 key) to re-measure the response at the last
position. This time on the screen, you will be presented with the mean
response.
Examine this mean response and consider the optimum target to aim for.
A flat in-room response is not desirable. Studies show that a more suitable
target is a response that is flat up to 100Hz and then falling uniformly by a
total of 6dB by 10kHz.
Tune the parametric filters first before using the low- and high-frequency
contour controls.
There are three filters, each having adjustable centre frequency, gain and
Q. Aim to suppress peaks first. Only if there are fewer than three significant
peaks should you consider filling in dips.
20
).
n
.
n
Figure 26
Figure 27
Figure 28
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