23
Teufel
·
LT 7
Subwoofer – Low-end cut-off frequency
Figure:
Low-end cut-off frequency, Set 30.00Hz
Here, you can specify the low-end cut-off frequency.
This is the frequency below which the subwoofer's le-
vel drops off. The frequency value denotes that point
where the level is -3 dB lower than the average level.
This is calculated in reference to the subwoofer's
linear frequency response curve.
The function of a high-pass filter is to split the audio
signal into two signals – a pass-through signal and an
attenuated signal. The point of separation is defined
by the cut-off frequency. The pass-through signal is
not affected by the filter; this reaches down to the
cut-off frequency. The attenuated signal is filtered
according to the filter order (e.g., +18 dB/oct). The
low-end cut-off frequency (-3 dB point) is the fre-
quency where the level of the pass-through signal
drops by 3 dB below the average level.
Press “Enter”. The symbol indicates that the new
setting has been applied.
Figure:
Determining the low-end frequency cut-off
value (example: 40 Hz)
Subwoofer – Low-end filter order
Figure:
Low-end filter order, Set 2
nd
order
The filter order specifies the change in level relative
to the frequency, i.e., it indicates the “slope” of the
frequency curve. The low-end filter order indicates
the level increase at the low end of the frequency
curve. A first-order filter increases the signal level
by 6 decibels per octave (dB/oct). An “octave” is the
point where the frequency is doubled (octave above)
or halved (octave below).
Each filter order increases the slope of the level
change by +6 dB:
1
st
order:
6 dB/oct
2
nd
order:
12 dB/oct
3
rd
order:
18 dB/oct
4
th
order:
24 dB/oct
The maximum slope available is +24 dB/oct, i.e., a
4
th
order filter. Press “Enter”. The symbol indicates
that the new setting has been applied.
Figure:
Low-end filter order (e.g., 3
rd
order)
Subwoofer – High-end cut-off frequency
Figure:
High-end cut-off frequency, Set 84.85Hz
Similarly to the low-end cut-off frequency, the high-
end cut-off frequency indicates that point in the
subwoofer's frequency response where the level
drops by -3 dB. This is calculated in reference to the
subwoofer's linear frequency response curve. Press
“Enter”. The symbol indicates that the new setting
has been applied.
11. Advanced setup options for the M 7200 SW
