Instruction manual

RV-1 • 6
For the surround effect, the output of U1:C, the lowpass filter is sent into an
inverting amplifier to give a signal which is 180 degrees out of phase with the
output of the lowpass filter. When sent into the right channel, this audio will
cancel some of the audio from the left channel at your ears when played
though your speakers. Since the audio that is canceled is from the delayed
sound, not the original sound, it produces an interesting effect of "widening"
the placement of you speakers. Sometimes it seems as if the audio is coming
right out of the walls! S1 switches from the surround effect to the normal
effect. With normal effect, the output of the lowpass filter is sent directly to
both left and right channels.
Other features on this kit provide for many other interesting effects. If JMP2
is placed in along with JMP5 and JMP7, a mono source can be sent into
either left or right inputs, and a stereo simulation will be heard on the left and
right outputs. For a mike input, JMP3, JMP4, JMP6, JMP8, JMP9, and
JMP10 are inserted, and then the Right output is speaker level output from
U4, and Left output is mike level out. If JMP3, JMP4, JMP5, and JMP7 are
inserted, then the unit has a mike in, and a surround effect output at line
level. If JMP5, and JMP7 are inserted, and R1, and R4 removed, then the
outputs are left and right rear channels for a surround system for a television.
This produces an effect like sounds bouncing off of the back of a theatre or
auditorium. Removing R1, and R4 prevents the original audio signal from
arriving at the output, just the delayed signal.