The basic goal of APL is to measure and correct exactly the loudspeakers PF
response to obtain uncolored and pure sound out of it.
The idea of a hall (room)
correction by introducing pre distortions in loudspeaker sound is risky and should be
well considered. The pre distortions introduced in signal pass before a loudspeaker, will
be not compensated of hall (room) distortions but will create new distortions that we
percept as speaker distortions.
Complicated Band- Pass type subwoofers. (band-pass filter)
There is known problem that Band-Pass type subwoofers have increased GDT (group
delay time). Subwoofers impulse response (APL Workshop is working with impulse
responses obtained for each of measurement points) does not get into measurement
Time Window, which is 50ms by default. To avoid loss of information about LF, it is
necessary to increase time window to 100ms by choosing “100_20Hz.wav” file in
selection “Time window file” and evaluate changes of curve in 30
-100 Hz range. If the
changes are significant, then use increased Time window - 100ms
in future. You should
consider 200ms windowing usage
for some very extreme cases.
Overall balance LF-HF
At the beginning of work it is necessary to consider that naturally, for most of the
loudspeakers (and its placements), low frequencies are boosted, and correction will
correct it by default (if you do not use target curve) and at the first moment after
correction is applied there is a feeling that bass is gone:
Summary of Contents for KLEAR AUDIO KLR1m
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