Setting & Saving Input Levels - PROCEED Audio Video Preamplifier Manual

setting & saving input levels
3 REPEAT THIS PROCESS FOR YOUR SECOND CHOICE (2:) AND THIRD
CHOICE (3:) CONNECTIONS AS NEEDED
With three connections, your second choice will be digital, with the third
choice being analog. If you chose to set up two connections (lacking an RF
output), then your second connection will be your analog hookup. Choose
audio: analog in the submenu, and then choose
you hooked up the analog connections from your laserdisc player). Save
your choices by pressing
The AVP includes a high quality analog to digital converter (ADC). Since all pro-
cessing in the AVP is handled in the digital domain, analog signals that are to be
changed in any way (other than volume) must first be converted to digital form.
It is extremely important to avoid overloading or "clipping" the ADC, since doing
so results in a nasty burst of distortion that sounds similar to a power amplifier
clipping. Unlike power amplifiers, this sort of clipping can occur at any volume
level, since the ADC is being clipped well before the volume control in the signal
path.
Fortunately, the AVP can detect when its ADC is being clipped, and posts a notice
to that effect in its front panel display and on the on screen display . If you see
such a message, you should turn down the input level on the AVP (which turns
down the volume of the signal going into the ADC). Y ou should also probably
save this new setting as the default setting for that input, which will save you
from running into this problem again—unless you later play something that is
even louder. (In which case, you simply repeat the process outlined below.)
1 TURN THE MASTER VOLUME CONTROL ON THE AVP DOWN
When the analog to digital converter clips, it distorts the waveform much as
a power amplifier does when it clips. This is both unpleasant to hear and
potentially dangerous to speakers at high volumes. Turn the volume down
to a quiet, but still audible level just to be on the safe side, but so you can
still hear what you are doing.
2 PLAY THE LOUDEST SELECTION YOU CAN FIND ON THE ANALOG
SOURCE IN QUESTION
Mind you, you are not playing this "loud section" loudly: keep it quiet, but
play the biggest musical crescendo or movie explosion available on the
source at hand.
3 PRESS INPUT LEVEL ON THE FRONT PANEL OF THE AVP AND RAISE/
LOWER THE INPUT LEVEL WITH THE VOLUME KNOB UNTIL THE DISPLAY
JUST READS "ADC CLIPPING"; THEN LOWER THE INPUT LEVEL BY 2-3 DB.
The goal here is to give yourself just a little "headroom" in case the next
recording you play is a bit louder than the one you are using for this ad-
justment.
the
.
enter
analog input where
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