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AUTO EQUALISATION - THE DN3600/DN60 CONNECTION
The DN3600 can be interfaced with the Klark Teknik model DN60 Real Time Spectrum
Analyser. The combination can then be used to perform an Automatic Equalisation function, to
compensate for the sound system frequency response. To do this, proceed as follows:
1. Make certain that both units are switched OFF. Connect the DN60 to the DN3600. The
interconnection is made using the pin-to-pin 16-way cable supplied with the DN3600. The
cable should be used to connect the DN60 "PLOTTER INTERFACE" to the DN3600 "DN60
INTERFACE". Switch ON the DN60 first, let initialise, then switch ON the DN3600.
2. Feed the signal from the DN60 pink noise source through a level control device, such as a
mixing console, into the DN3600 input - whichever channel is to be equalised. Keep the pink
noise level down at this point. Make certain that any other equalisation in the pink noise
signal path, such as on a mixing console input channel, is set to a flat position.
3. Set the DN60 microphone at the desired listening/measurement position in the venue.
4. Slowly bring up the level of the pink noise through the sound system to an average listening
level.
5. Set the DN60 controls to Avg., Cont., Resp 3., 1 dB resolution, mic input. Adjust the DN60
Reference Level until the full frequency response display is seen.
5. Switch the More EQ section OUT (More EQ, In/Out, Exit if required).
6. Enter the DN3600 Auto/Q menu (Utilities, Auto/Q). Repeatedly press the Auto EQ button
allowing sufficient time between presses for the DN60 display to settle. Continue until a flat
response is obtained on the DN60 display. Six to eight iterations are usually enough. It may
be necessary to adjust the DN60 Reference Level between iterations.
What happens is this. On each iteration the DN3600 obtains the measured room response from
the DN60, calculates the room response correction, limits it to +/-4 dB and adds this to the current
Graphic settings. With each iteration the measured response gets closer and closer to flat until
finally all the DN3600 is doing is to correct minor random variations.
Note. The DN3600 should not be in bypass mode. If it is the room correction curve will still be
added to the DN3600 settings but the measured response will not be affected and the Auto EQ
function will not perform as specified.