µ-Dimension Glow DSP8 Instruction Manual page 46

determine which speaker is the furthest from the listener's ears. For
single seat SQ system designs, this will be done for all speakers in the
system relative to the single speaker furthest from the driver's head
location. For multiple seat SQ system designs, you will do this for
each channel of the system independent of the other channels.
Now, calculate the difference in distance between the furthest speaker
and each of the other speakers, and write the values down. These
numbers will be a starting point to enter in the signal processor for
delay values on each speaker
Setting Delay by Ear
This step can be accomplished regardess of whether an RTA has
been used to initially tweak the delay settings or not. Using the RTA
might help get a little closer to optimizing the delay settings in a
shorter amount of time, but in the end, your ears should be used to do
the final tweaking and analysis as to the success of your efforts.
Sit in the designated listening position, and play some familiar
reference music, preferably something simple like spoken voice,
and/or music with only one vocal and maybe a few instruments,
through only the channel being adjusted. Choose one of the speakers
on that channel as a "reference" on which the delay will not be
adjusted. Now, listen critically to the sound, and at the same time,
adjust the delay for each of the other speakers on that channel,
sweeping it from above the original setting to below, several times.
Sweep the setting slowly so your ears have a chance to pick up the
minor changes occurring as you make the changes. Listen for the
stability of the images, the apparent height of the image, and the
overall tonal balance. The apparent image will likely shift in multiple
directions, and become more and less coherent with different settings.
If there are only two speakers on a particular channel (i.e. midrange
and tweeter), then it is fairly easy. If there are three or more speakers
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