Installation guide

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measurement and record details about the measurement. These are
1. Room Name
2. Room Measurement Position
A number of parameters, set in the Room Measurement Wizard, affect the room measurement.
These are
1. Measurement signal sweep duration
2. Number of sweeps
3. Whether drivers (of a speaker) are measured concurrently or not
4. PDC Profile to be used during the measurement
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).
The number of sweeps can be set between 1 and 36. Fewer sweeps allows faster speaker
measurement, but more sweeps can yield better measurement results, including higher
confidence. The sweeps are added together and averaged to reduce the effect of discontinuous
noises during the measurement.
When drivers (of a speaker) are measured concurrently they may reinforce or cancel each other
at certain frequencies near the crossover frequency. This should be allowed for in any room
correction and thus DEQX recommends that drivers be measured concurrently.
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A number of parameters, set in the Calibration Wizard but adjustable before the correction is
generated, affect the speaker correction. These are
1. Smoothing
2. Crossover Algorithm
3. Crossover Slope
4. Crossover Frequency
5. Boost Limit
6. Cut Limit
7. Number of Boost/Cut Bands
8. Maximum Group Delay
9. Group Delay Tolerance
10. Magnitude Tolerance
Smoothing, as the name suggests, smooths the measured response of the speaker before it is
used as an input into the speaker correction process. The process reduces sharp changes in the
time, frequency and phase-response on a logarithmic frequency scale. This method provides a
more natural smoothing that is more closely correlated with how we actually hear. Smoothing can
be used to reduce the effect of reflections or other artefacts in the measured response.