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CS-8 Series PHS-28 Rev1.01, Dec. 2013
Reso: The influencing variables on this parameter will change the self-
resonance of the phaser chain, by feedback the audio signal at a selected stage
to the input (Fig. 3). With that selective gains at certain frequencies will occur,
namely exactly at that frequencies where the notches are (Fig. 4), so, at
-180°+N·(-360°). The stage for the feedback can be selected with the rotary
switch
Fb Stage (10)
Out Stage
independently of the
. The provided stages as well as for the out
stage are in multiples of 2 (360° units), so, 2, 4, 6, 8 and in A
B mode (serial
→
routing of channel A and B, see below) 10, 12, 14 and 16. Figure 5a shows from
top to down the amplitude response at the 4th stage (50-50-mix) without
resonance, the amplitude response at the 4th stage at high resonance fed
back at the 8th stage and at last the corresponding phase response at stage 4.
Previously, it was implied the same center frequency for all 16 stages. But
because of the ability to control both channels A and B, separately, even in the
serial modes the relationships of the notch frequencies can be further shifted,
Det
e.g. by the
-controller or external CV. By detuning the channels and 2
feedback loops at the same time and working in one of the two serial modes
2.) or 3.) (see below) at certain frequency settings congruence of resonance
frequencies (notches) will occur resulting in dramatically higher selectivity at
higher resonance values greater than zero. The possibilities are almost endless.
-17-
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