dbx 128 - Program Expansion; Program Compression; Peak Limiting and Noise Reduction Recording

To Expand a Program
1. Set your preamplifier’s INPUT SELECTOR Switch
to the appropriate source (i.e. PHONO, TUNER or AUX),
and the TAPE MONITOR Switch to TAPE.
2. Press the 128’s DISC, BYP and POST Switches, and
set the ABOVE THRESHOLD/LINEAR Switch to the
LINEAR position (IN).
3. Set the COMPRESS/EXPAND Control to the desired
degree of expansion (usually between 1.2 and 1.4). Do not
over-expand, especially on classical music.
4. Set the LEVEL Control so that the ABOVE
THRESHOLD LED lights on loud passages and the
BELOW THRESHOLD LED lights on quiet passages.
To Peak Unlimit a Program
1, Set your preamplifier’s INPUT SELECTOR Switch
to the appropriate source (i.e. PHONO, TUNER or AUX),
and the TAPE MONITOR Switch to TAPE.
2. Press the 128’s DISC, BYP and POST Switches, and
set the ABOVE THRESHOLD/LINEAR Switch to the
ABOVE THRESHOLD position (OUT).
3. Set the COMPRESS/EXPAND Control to the desired
degree of peak expansion (usually between 1.2 and 1.6).
4. Set the LEVEL Control so that the ABOVE
THRESHOLD LED lights-only on musical peaks, or for
the desired effect.
To Compress a Program
1. Set your preamplifier’s INPUT SELECTOR Switch
to the appropriate source (i.e. PHONO, TUNER or AUX),
and the TAPE MONITOR Switch to TAPE.
2. Press the 128’s DISC, BYP and POST Switches, and
set the ABOVE THRESHOLD/LINEAR Switch to the
LINEAR position (IN).
3. Set the COMPRESS/EXPAND Control to the desired
degree of compression (usually between 1.2 and 3.0). Too
much compression can cause unwanted side effects.
4. Set the LEVEL Control so that the ABOVE
THRESHOLD LED lights on loud passages and the
BELOW THRESHOLD LED lights on quiet passages.
To Peak Limit a Program
1. Set your preamplifier’s INPUT SELECTOR Switch
to the appropriate source (i.e. PHONO, TUNER or AUX),
and the TAPE MONITOR Switch to TAPE.
2. Press the 128’s DISC, BYP and POST Switches, and
set the ABOVE THRESHOLD/LINEAR Switch to the
ABOVE THRESHOLD position (OUT).
3. Set the COMPRESS/EXPAND Control to the desied
degree of peak limiting (usually 10.0 or higher).
4. Set the LEVEL Control so that the ABOVE.
THRESHOLD LED lights only on musica! peaks, or for
the desired effect.
To Record with Peak Limiting and
dbx I! Tape Noise Reduction
1. Set your preamplifier’s INPUT SELECTOR Switch
to the appropriate source (i.e, PHONO, TUNER or BUN).
and the TAPE MONITOR Switch to TAPE.
2. Press the 128’s DISC (IN) BYP and POST Switches,
and set the ABOVE THRESHOLD/LINEAR Switch to the
ABOVE THRESHOLD position (OUT).
3.
Set
the
COMPRESS/EXPAND
Control
for
the
desired
degree
of
compression.