Installation guide

96
The speaker to be measured should be connected to the user’s power amplifier. The inputs of the
power amplifier should be connected to the appropriate outputs of the PDC. Refer to Speaker
Wiring and Amplifier Connection in the PDC-2.6 and PDC-2.6P User’s Manual.
Before carrying out a speaker measurement, you should ensure that all forms of extraneous
noise have been eliminated or at least reduced as much as possible. For example, close doors to
other rooms and turn off fluorescent lights and air conditioners. Note: DEQX’s measurement
process reduces the effects of extraneous noise, nevertheless less extraneous noise will provide
a more accurate speaker measurement.
A#-7@-%*E-7/:%-2-.)*I7%72-)-%/
A number of parameters, set in the Measurement Wizard, identify the speaker measurement and
record details about the measurement. These are
1. Speaker Manufacturer
2. Speaker Model
3. Speaker Serial Number
4. Measurement Name
5. Measurement Distance (the horizontal distance from the microphone to the speaker)
6. Measurement Angle (the angle between (i) the horizontal speaker axis and (ii) the
horizontal line between the microphone and the centre of the front of the speaker)
7. Measurement Height (the height of the microphone from the floor)
A number of parameters, set in the Measurement Wizard, affect the speaker measurement.
These are
1. Measurement signal sweep duration
2. Number of sweeps
3. Tweeter (and midrange driver) minimum measurement frequency
The measurement signal is a log sweep. DEQX's research has determined that a log sweep
yields better results and better signal to noise ratios than other signals, such as white noise, pink
noise and psuedo-impulse signals. The measurement signal sweep duration can be set between
0.4 seconds and 2.8 seconds. A shorter duration allows faster speaker measurement, but longer
signals can yield better measurement results, including higher confidence (see Confidence in the
Glossary).