The LMC1982 has an enhanced stereo effect that can be
achieved by cross-coupling reverse phase information between
the left and right stereo channels. This feature can
help improve the apparent stereo channel separation when,
because of cabinet or equipment limitations, the left and right
speakers are closer to each other than optimum.
Enhanced stereo is created by connecting an external frequency
shaping RC network between the OUTPUT operational
amplifiers’ inverting inputs through an internal CMOS
switch (see Figure 6). The external network couples 60% of
each channel’s output to the opposite channel’s inverting input.
This cancels a portion of the signal common to both
channels.
The desired 60% cross-coupling is accomplished through
the internal 6.5 k