dbx 122 - Page 17

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2. Setup your tape recorder for tape recording, but do
not record a tape (use the recorder’s PAUSE switch). Play
the source through your system at an average listening level
and adjust the tape recorder’s input level controls; with a
test tone, levels should be set for “OVU” ona reel to reel
recorder or ““-3VU” on a cassette recorder. With program
material, only the peaks should reach these recommended
levels; the average VU meter readings should be —2dB to
—3dB for reel-to-reel and —4dB to —7dB for cassette
recordings.
3. Now reset the dbx unit as shown below:
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4. Without touching any of the recorder’s level controls,
adjust the dbx (Tape) RECORD LEVEL MATCH control(s)
so that your recorder’s VU meters read about the same as
they did with the dbx unit in BYP mode. (For program
material, the average meter deflections can be made to
match those in BYP mode, but the amount the meters move
will be cut in half by dbx REC processing.)
Play Level Adjustment
This adjustment is for listening convenience only, and its
function is to make the average listening levels from your
system about the same whether you are playing conven-
tional sources (dbx in Bypass mode) or dbx encoded
sources (dbx in Play mode).
Adjusting the 124’s Disc Play Level Match Control
1. Set the 124’s front panel switches as shown below:
2. Set your preamplifier as follows: INPUT SELECTOR
Switch at PHONO; TAPE MONITOR Switch at TAPE.
3. Play a dbx encoded disc through your system.
4. Adjust the 124’s Dise Play Level Match control so
that, on moderately loud passages, the levels are approxi-
mately the same when the channel 2 & 4 BYP and PLAY
switches are alternately pressed.
Adjusting the 124’s Tape Play Level Match Control or the
122’s Play Level Match Control
For this adjustment, you will need a source of a 1kHz
test tone or any dbx Ii encoded tape. Since the adjustment
is for listening convenience only, if you do not have a tone
source or a dbx encoded tape, you can delay the adjust-
ment until after you record a dbx encoded tape.
1. Set the dbx front panel switches as shown below:
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2. Set your preamplifier as follows: INPUT SELECTOR
Switch at PHONO; TAPE MONITOR Switch at TAPE.
3. Play a dbx encoded tape through your system. You
can use a tape of program material with fairly constant
level. For more accurate settings, you can use a tape
recording of a 1kHz tone (taken from an oscillator or a
test record). If a 1kHz tone is used, the tape need not be
dbx encoded.