dbx DriveRack 480, User Manual

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®
To optimize sound performance in a live application, you may wish to “Pink” a room with the
Real Time Analyzer available in the 480 and 480R DriveRack™ units. Pink Noise is defined as
equal loudness at all frequencies. Pinking a room gives you a good starting point for fine-tun-
ing the room to your desired requirements. The built-in pink noise generator (along with the
built-in RTA), will help provide an accurate reading of the outputs of your speakers. Although
the 481 and 482 do not have an LCD, they also include an RTA module, which can be accessed
and viewed through the GUI interface. The recommended procedure for “pinking” a room
using the 480 or 481 DriveRack™ is as follows.
• Connect a measurement microphone (omni-directional with flat response) to input 3 or
4 of the 480, or the RTA input of the 480R.
• Connect a measurement microphone (omni-directional with flat response) to input 3 or
4 of the 480, or the RTA input of the 480R.
• On page seven of the Utility menu, make desired adjustments to the Mic pre set-up.
• From program mode, use either the
OTHER
or
PARAMETER 2
and
3
buttons to move
to the inputs which are sending signal to your speakers.
• Once you have reached the desired inputs, use the
PREV PG
or
NEXT PG
buttons to
move to page 2 of the input section.
• Use the
PARAMETER 1
knob to activate the pink noise generator and use the
PARA-
METER 2
knob to set the desired noise level.
• Using a program that utilizes an RTA, press the
RTA
button and use the
PARAMETER
1
knob to select the Input channel which uses the RTA mic (either 3 or 4).
• Once the input has been selected, the RTA display should be displaying an accurate read-
ing of the pink noise being produced by the loudspeakers.
• Take notice where the frequency spectrum is either boosted or cut.
• At this point, you simply toggle between the graphic EQ and the RTA, while adjusting
the graphic EQ to compensate for the boosts or cuts in the frequency spectrum.
• The RTA will display the response of the system as changes are made.
• At this point you will have completed the process of pinking the room and now you can
fine-tune your system to your desired requirements.
A.10 “Pinking” A Room
Appendix A
DriveRack
™
DriveRack™ User Manual
107