PRELIMINARY
miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
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To alter the region of correction, drag the grey handles on either side of the graph. Note that you can’t drag
these handles over an anchor point, so you may need to
move or delete an anchor point that is “in the way.”
If channels are linked, the same target curve is used for that group of linked channels. To create a separate
target curve for a single channel, unlink it as described in
Working with graphs
.
6.2.3
Guidelines for target curve design
Care should be taken to create a target curve that works well with your speakers and in your vehicle, as well as
suiting your personal preferences. Small changes to the target curve can have significant effects on the tonal
quality of the system, so it is important that you experiment with different target curves to find the optimum.
If you initially don’t achieve a satisfactory result, please ensure that you have spread your measurements over a
sufficiently large area and with sufficient variation in height. The following guidelines will help you understand
how to adjust your target curve.
Low-frequency extension and boost
All loudspeakers have a natural low-frequency roll off. Setting the target curve to boost the region
below the spea
ker’s natural roll off frequency
may
result in overdriving the speakers, especially with
smaller loudspeakers.
The auto-target estimates the low-frequency roll-off and curve. You should determine by listening
whether this estimate is suitable for your system and adjust the target curve accordingly.
High-
frequency “tilt”
The target curve is the desired measured response of loudspeakers
in your vehicle,
in contrast to
measurements made of a loudspeaker during design under anechoic (measured in free space)
conditions. The target curve typically has a downward-
sloping or “tilting” response at high frequencies,
due to the effects of limited dispersion at high frequencies and greater acoustic absorption.
