µ-Dimension Glow DSP8 Instruction Manual page 40

more EQ adjustments to the system later to compensate for acousti-
cal correction necessary to optimize the desired sound quality, but we
want to start with a clean, smooth signal during initial system setup.
So, when the RTA is connected to the processor outputs to confirm
the proper utilization of the mixer for re-combining channels, you can
also verify and correct the initial frequency response if needed. To
accomplish this, route the mixed input signal to a channel within the
DSP8 with the crossover section set to all-pass (i.e. no crossover).
With the RTA connected to this channel output, adjust the EQ so that
the displayed response curve is relatively flat and smooth across the
entire frequency range.
Start by pulling down peaks first. Don't boost anything on the EQ
until you determine that is the only way to flatten out the response in
that frequency region.
At this point, the system is not ready for fine tuning the EQ. Let's
save the EQ fine tuning until after we have dialed in the other DSP8
settings in the crossover, delay, and output sections. Quite often,
much of the work necessary to tailor the frequency response can be
accomplished with the crossover, delay, and output speaker polarity
and level adjustments.
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Very Important: If you decide to boost a particular frequency to fill in a
hole in the response, watch the RTA display carefully when making the
adjustments. If the display show a consistent corresponding increase
in level (i.e. you push up a slider 3 dB and see a 3 dB increase on the
corresponding RTA band), then you can assume the EQ can be used
to help to correctly fill that dip in response.
However, if you increase the level of a particular band, but do not see
the same increase on the RTA display, then you can not use the EQ to
"fix" that particular response problem. In this case, the dip is likely
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