E-Mu PS12 Owner's Manual page 12

For example, if you set the LPF to 80Hz and the HPF to 75Hz, you will hear sound from both speakers between 75Hz and 80Hz.
However, this might cause an audible boost in that frequency range.
80
60
55
LOWPASS
FREQ (Hz)
0
-3
-6
-10
Set the LPF to 80Hz and the HPF to 85Hz, and there might be a point somewhere between 80Hz and 85Hz where neither
speaker is playing, causing a dip when you listen to your filter sweep.
80
60
55
LOWPASS
FREQ (Hz)
0
-3
-6
-10
Experiment with the HPF knob until you find the right balance where there is neither a dip, nor a boost near the crossover
frequency. It is important remember that the ideal settings for these knobs will vary depending upon room size and shape, where
you place the PS12, and the performance of your satellite speakers.
Phase
This controls the phase of the signal going to the subwoofer amplifier, thus changing the relationship between the subwoofer
signal and the satellite output signal.
Phase cancellation occurs when two identical signals reach your ears at different time. Depending on your filter settings, there will
likely be a small range of frequencies (near the crossover frequency) playing through both the subwoofer and attached satellite
speakers.
Unless the distance between the subwoofer and your ears is identical to the distance between the satellite speakers and your
ears, these frequencies will be slightly out of phase with each other. You can use the variable phase control to change the phase of
the subwoofer output from 0 to 180 degrees to compensate for this disparity.
Remember Your Settings
Once you find the optimum settings for your PS12, you can mark them on the following template for future reference. Two extra
knobs are provided for your satellite speakers.
80
1 00
120
60
flat
55 0
LOWPASS PHASE
FREQ (Hz)
1 00
1 20
flat
75 80
Frequency (Hz)
1 00
1 20
flat
80 85
Frequency (Hz)
90
min max
1 80
LEVEL
60
80
55
100
120
40 135
HIGHPASS
FREQ (Hz)
Low-Pass
High-Pass
Combined
60
80
55
100
120
40 135
HIGHPASS
FREQ (Hz)
Low-Pass
High-Pass
Combined
60
80
55
100
120
40 1 35
Satellite L
HIGHPASS
FREQ (Hz)
Too much overlap between
the satellites and the
subwoofer causes a boost in
the combined signal near the
HPF and LPF frequencies.
Too little overlap between the
satellites and the subwoofer
causes a dip in the combined
signal between the HPF and LPF
frequencies.
Satellite R
9