Chapter 13. Active Multi-way Speakers
13.6 WOOFER CALIBRATION WITH AN IN-ROOM MEASUREMENT
The woofer of a three-way speaker can be calibrated with a speaker measurement
taken with the microphone at the listening position. This technique can be used if the
three-way speaker is being implemented with the “bi-amp with optional stereo
subwoofers” speaker configuration mode (Figure 6 on page 108). It can also be used
with a three-way hybrid active-passive three-way speaker (Figure 7 on page 109).
This method is an alternative to the nearfield measurement and calibration technique.
It is a little more involved but – if done correctly – can also address room modes directly.
DEQX recommends that the nearfield measurement and calibration method be used
first. Once good results are obtained, this method can then be trialed and compared by
switching between profiles.
Measurement
Position the microphone at the center of the listening area and take a speaker
measurement. Move the microphone around the listening area during the
sweeps. (Use a higher number of sweeps, and move the microphone after every
three sweeps.)
Calibration
Use a long time window and set smoothing at 100%. If the microphone has been
moved during measurement, a lower amount of smoothing can also be trialed.
Use the Limits box to limit boost to the range 3–6 dB and turn step correction off.
Configuration
Load the correction filters into the configuration and upload the configuration to
the DEQX. Then perform an integration step using the procedure described in
Chapter 11 to set the levels and delays of the woofer and the mid-tweeter.
The example below shows the Filters tab after configuring the three-way speaker. Note
that the curves for the left and right woofers are different (compare to the example on
page 120) and account for room response variations between left and right woofers.
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