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INDEX
BRIEFOPERATING INSTRUCTIONS
INTRODUCTION Why UseAnExpander
Dynamic Range
Restricting DynamicRange
Compression andLimiting
dbx Tape Noise Reduction
HOW THE3BXAND OTHER EXPANDERS WORK
CONNECTIONS
OPERATION EXPANSION
To Expand anFM Broadcast orConventional PhonographDisc
To Expand aTape During Playback
How toExpand andTape Copy aProgram
Combining 3BXExpansion withdbxTape Noise Reduction
SIMPLE PRECAUTIONS WHENUSING ANYPROGRAM EXPANDER
SPECIFICATIONS
dbx PRODUCT WARRANTY
FACTORY SERVICE
SCHEMATIC GLOSSARY 2
4 4
4
45
6
8
11
14
14
14
15 15
16
17
18
19
19
20
I
WARNING: TOPREVENT FIREORSHOCK
HAZARD, DONOT EXPOSE THISAPPLIANCE
TO RAIN ORMOISTURE.
/9.2:5"8
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BRIEFOPERATING INSTRUCTIONS
Fig.1- 3BX Front Panel
REMOTE INDICATOR EXPANSIONAdjustthisslide con-
This L.E.D., abovethe trolforthe desired degreeofexpan-
R EMOTE switch,glows sian.A"1.4" setting meansthatan
when theREMOTE CON-inputsignal witha40dB dynamic
TROL UNITisactivated rangewillbeexpanded to56dB, or
by the REMOTE switch. thataninput signal witha50dB
. \dynamic rangewillbeexpanded to
PI.
LOT This.L.E..O. 70dB.A1.2 setting wouldresultin
(lIght emitting diode), a20% increase ofdynamics; a1.4
above thePOWER settingwouldresultina40%
sWitch, glowswhen increaseofdynamics etc
the 3BX isON. '.
MF ---------- MF
PREPushthisswitch
to expand aprogram
before recording it..,.
TAPE
Pushthis
switch andthePOST
switch toexpand
programs coming
from yourtape
recorder. Ifyou do
not hiJve atape
recorder, pushthe
SOURCE switch.
SOURCE
PushthiS
switch andthePRE
switch toexpand
programs coming
from yourphono
graph, FMtuner or
other auxiliary
equipment.
RECORDER
POST Pushthis
switch andtheTAPE
switch toexpand a
program played
back from your
tape recorder.
*Expansion will,inmost cases, increase the
dynamic rangeofaprogram beyondthecapa
bilities ofyour taperecorder. Toexpand aprogram
and then record it,we recommend u.
