capacitors which determine the frequency band of each filter. The potentiometers adjust
the predetermined regions of frequency in each unit.
The components must be high quality and have low tolerance, Specifically potesometer RV1.
the 10 and capacitors. The resistors must be metal-film type.
If it is intended for stereo use then it will be supposed it is made in two pieces with as
much as possible suited the materials, between the channels, so that do not exist differences
in the regulation of each band frequencies.