dbx 165A Manual de instruções - Página 7
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Since dbx Over Easy compressor/limiters
have no
distinct point at which the gain changes, the threshold
on such units is defined differently
from conventional
units. We define the threshold to occur approximately
mid way between the fixed gain portion of the curve and
the point where the curve "levels off" at the selected
compression ratio. At an infinite compression setting,
threshold
is
defined as the level at which 6 dB gain
reduction is realized. At this setting, the maximum
permissible output level is 5 dB above the threshold.
At
lower
compression settings, the threshold represents
somewhat
less
gain reduction. ( In contrast, a conventional
compressor/limiter
yields O dB of gain reduction at the
threshold; gain reduction begins just above the threshold.)
To see how the 165's Threshold indicator LEDs correlate
with the compression curves, refer to Figure 4.
+
20
+
15
iii+
10
~
~
+
5
UJ
>
UJ
~
0
I-
:,
a.
-
5
I-
:,
O
-
10
-
15
1
:
1
oo:
1
"-~ ',
RED
~'c>-c.. ,
Abov
e
threshold
'
~
',
Over easy
range
<v~
«,;
0«:- Below
threshold
-
15
-
10
-
5
0
+
5
+
10
+
15
+ 20
INPUT
LEVEL (dB
)
Fig. 4 - How The 165 Threshold
Indicator
LED's
Correlate With The Compression Curve
SIGNAL CONNECTIONS
Make input and output connections to the barrier
strip on the rear panel ( Figures 5 and 6).
Input
Connection
For balanced or floating
lines,
connect the signal
leads
to the(+) and(-)
terminals, and the shield to the chassis
ground (
* )
terminal. For unbalanced I ines, connect the
signal high lead to the (+) terminal, and jumper the
(-
)
and chassis ground (~ ) together for connection of the
shield. When using an unbalanced connection, reversing
the(+) and(-)
input terminals will cause the output
signal to be 180° out of phase (reverse polarity) relative
to the input signal.
Level
Detector
Input Connection
For normal compressor operation, leave the factory-
installed straps connected between the
Detector(
+) and
the Input Signal (+) terminals and the Detector(
-
) and
Input
Signal(
-
) terminals. (Refer to Figure 5.) If you
wish to gain access to the
165's
Detector Input for
insertion of an auxiliary device, you may do so by
removing the strapping, wiring the auxiliary device's
output to the 165's Detector
Input
term
inals,
and
feeding the auxiliary device's input with the same signal
fed to the 165's Signal Input. In certain situations, the
auxiliary device may need to be inserted in the signal
path, not in the detector path.
In
such cases, signal is
fed to the input of that device, and also to the detector
input, and the auxiliary device's output
is
fed to the
165
signal input. Unless the installation is permanent,
this
connection can be awkward. Therefore, we recom-
mend wiring a few Tip/Ring/Sleeve phone jacks to the
165 instead, and
using
the jacks for Signal and Detector
Inputs as well as for the Signal Output. (Refer to
Figure 6.)
(0
PTI
ONALI
RING SLEEVE
PHONE
PLUG
SIGNAL
1•NPUTI
SIGNA
L
IOUTPU
T
I
6
T
HIGH
R
LOW
,
s
f
>HIElD
2
-----
3
DETECTOR
INP
Ul
HIGH
LOW
..L
0
DETECTOR
INPUT
..L
XL
',,<-:C:.
SH
::,:I
E
c::
L0
::........,,.1
,
____
J
RECOMMEND NOT
CONNECTING
TH(
~
-
SHIELOHERE
!UNLESS
HUM
OEVElOPSI
CONNECTOR
•
~--~
NOTE: Straps Connecting Signal and
Detector Inputs are shown in place.
HIGH
INPUT
5A -
Balanced Configuration
SIGNAL
IIN
PUT
I
..L
StGNAL
IOU
TP
U TI
..L
HIGH
LOW
SHIELD
IC NO)
RECOMMEND_/
CONNECT ING
SHIELD HERE
!O
PTIONAL
I
STD
PHONE
PLUG
1
XL
CONNECTOR
---j-~-
------'~o
HIGH
LOW
PHONO
lOW
SHIELD
INP
UT
CONNEC
T
JUMPER
HERE
'--+-,I----+-+--.---
PlU
G
SHIElO
DO
N
OT
CONNECT
SHIELD
Al
TH
IS
ENO
TO
JO
IN
l.OW
( .)
A
N
O
SHIELD
I-ti
5B - Unbalanced
Configuration
Fig.
5 - Typical Signal
Connections
to
165 Input
&
Output
ICNOI
\
_____
US
E
OUAl
CO
NDU
CTOR
SHIELDED
CA81.E
&
"
TIE"
TH
E
LOW
&
SHIEL
D
TOGETHER
AT
T
HI$
POINT