Wisdom Audio DCAB-1 User Manual

Page 28

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28

Calibration Data

The Calibration Data section of the terminal window (see example below
right) holds specific offsets required to match to microphone supplied with the
DCAB-1 with a known reference microphone at the Wisdom Audio factory.
(Data shown is only an example; your calibration data will vary.)

Each calibration frequency is labeled, for example:
“cal25” refers to “calibration at 25 Hz” and “cal1000”
refers to “calibration at 1000 Hz.” The last four calibration
frequencies are 10k (10,000 Hz), 12k5 (12,500 Hz), 16k
(16,000 Hz, and 20k (20,000 Hz).

If your microphone was ever damaged or lost, you could
purchase a replacement from Wisdom Audio. If this were
to happen, you would enter the calibration data that
came with your replacement microphone here, before
you start working with the DCAB-1 and its new micro-
phone. (Do not use the data at right.) The DCAB-1 will
take this information into account, displaying a corrected
RTA curve in the bottom of the terminal screen.

To do so, press the right arrow until the cursor moves
over to the “cal25” position; use the up or down arrows
to enter the cal25 value; move on to “cal32” and do
likewise. Enter all remaining values. You do not have
to save anything; every change is made in real time, as
you change the value, and saved automatically in the
DCAB-1.

RTA Controls

The DCAB-1 also includes a

1

3

-octave Real Time Analyzer (RTA) that displays

the system’s frequency response based on the signal received by the (calibrated)
microphone. This section of the terminal window provides control over these
functions.

The various controls work as follows:

pink

The pink parameter acts as a volume control for the pink noise generator within
the DCAB-1. On most system, a setting of 5-6% is a good starting point.

pinkin

The pinkin control allows you to turn the signal on or off to either the Left or
Right speaker. (Think of it as the “pink noise input” to the system.) The left
control sets the Left speaker, and the right control sets the Right speaker. Either
may be on or off. The only time you would have both on at the same time is to
check for a tightly-defined phantom center image. Do all your measurements
one channel at a time.

analyzer

The analyzer control toggles the analyzer’s display on and off. Note that be-
cause RS232 is relatively slow, it takes a a few seconds to redraw this display. If
you own a dedicated RTA, you may want to use it in parallel with the one built

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