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15
Equalising to a Preferred Curve
Whilst the Auto EQ function tries to equalise to flat (as measured by the DN60) it is possible to
perform an approximate Auto EQ to a preferred house curve by making use of the Bypass setting
of the DN3600.
To do this set up the house curve on the DN3600, or Recall the desired curve from memory (the
memory itself will not be modified by the Auto EQ function). Connect the DN60 and DN3600
as defined in 1. above. Inject pink noise into the system as defined in 2. above. Measure the room
response as described in the DN60 operators manual. Bypass the DN3600. Perform the Auto
EQ function once and once only. Do not iterate.
Note. The spectrum display may be"frozen" by saving it to a DN60 memory and switching to
mem. mode.
The room response is corrected subject to the Auto EQ adjustment limit of +/-4 dB. This Auto
EQ adjustment limit is the reason for the approximate room correction.
The reason for performing the Auto EQ function only once is because the measured spectrum
of
the pink noise is not modified by the DN3600. With the equalise to flat connection defined above
each iteration brings the overall system response (including the DN3600) closer to flat. With the
DN3600 bypassed this cannot happen. Hence the same correction factor would be added each
time.