dbx 160SL - Manual (Page 18)

14
160S
lue
series
b
160S
160S
160S
controls controls
160S
notes notes
160S
160S
160S
Operations
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
160S
Operations
Inspection Inspection
Operating Operating
Operating Operating
Connection
Connection
Installation
Installation
Technical
Technical
Introduction Introduction
to your system to your system
considerations considerations
contents
contents
concept
concept
diagram
diagram
applications
applications
support and factory service
support and factory service
160S
Specifications
Specifications
160S
160S
160S
160S
160S
160S
Manual
Manual
Design
Design
Block
Block
Controls
Controls
Advanced
Advanced
Warranty
Warranty
lue
series
b
Operating Level
Headroom
Clipping
Noise Floor
Useable dynamic range
Clipped signal heavily distorted
Audio levels below here are not heard, because of noise
+10
0
-10
-20
time
+10
0
-10
-20
time
input
dBu
Figure 2 Figure 1
Figure 3 Figure 4
input
dBu
+10
0
-10
-20
time
+10
0
-10
-20
time
output
dBu
output
dBu
INPUT OUTPUT INPUT OUTPUT
CHANNEL ONE CHANNEL TWO
A B
2 1
3
Jensen ®
Output
Transformer
Jensen ®
Output
Transformer
10k 1W
GND
Switch
GND
Switch
BALANCED FLOATING OPERATION UNBALANCED FLOATING OPERATION
Chassis
Ground
Chassis
Ground
Chassis
Ground
Ground Switch open
Unbalance Switch open
Ground Switch open
Unbalanced Switch closed
(6dB drop in output level)
Jensen ®
Output
Transformer
Jensen ®
Output
Transformer
10k 1W
GND
Switch
GND
Switch
BALANCED GROUND-
REFERENCED OPERATION
UNBALANCED GROUND-
REFERENCED OPERATION
Chassis
Ground
Chassis
Ground
Ground Switch closed
Unbalance Switch open
Ground Switch closed
Unbalance Switch closed
(6dB drop in output level)
+
-
+
-
+
-
+
-
Source
Device
(mixer)
EQ
IN
OUT
Audio
Outputs
Source
Device
(mixer)
Audio
Outputs
DELAY
Audio
Inputs
Audio
Outputs
Sidechain
Return
Sidechain
Send
Audio
Inputs
Audio
Outputs
Sidechain
Return
Sidechain
Send
2 1
3
Chassis
Ground
2 1
3
Chassis
Ground
2 1
3
Chassis
Ground
160SL
160SL
UL60065
FUSE:
T 500mA L
250V
Sid echain Send and Return Connectors: When the front panel Sidechain switch is in the IN position,
the 160SL RMS level detection is “listening” to the audio signal presented at the Sidechain Return
connector. Each channel features separate sidechain capabilities using the same quality gold-plated
Neutrik
® XLR connectors as for the main audio input and output connections. Each channel’s sidechain
connections are marked “send” for the output, and “return” for the input. Note that input and output
cables may be permanently installed here without disrupting the 160SL’s normal signal path; sidechain
functions are only active and available while the unit is in sidechain mode, selected from the front panel.
This feature makes the 160SL ideal for permanent mounting in a large rack system, with connections
going to a patch bay. When selected, the sidechain Send connector (XLR male) “sends” the audio signal
from the 160SL to the outboard gear in the sidechain loop. (ie: dbx 20 or 30 Series Graphic Equalizer or
digital delay. See the section marked Operating Notes for more information on the sidechain functions
of the 160SL.) The audio is processed, and sent from the output of that device back to the 160SL via the
Return connector (XLR female). As the signal is brought back into the 160SL, its RMS level is used to
trigger the compression/limiting. This allows the 160SL to be very versatile in many applications, from
ducking to frequency-specific compression or limiting. Two separate cables are used in favor of the
conventional single “Y” cable, because they supply balanced signal to the sidechain gear, and are much
more convenient to locate and use in a fast-paced studio or live sound environment.
The signal path of the sidechain function is “relay-selected” in order to keep the signal path short and
clean.
Ch assis Ground Binding Post : The green Chassis Ground binding post is supplied to give the user
another method to provide comprehensive grounding options for any installation. It is easy to think of
the binding post as being synonymous with the ground pin on any AC power cord. (The ground pin on
an AC cord should NEVER be removed, shorted out, or “lifted”). The post allows the chassis ground to
be connected to another ground source if desired (ie: a chassis ground system provided by another piece
of gear). Wire may be connected to the binding post by securing the stripped end of the wire through
the hole in the post, located under the hardened plastic nut-top of the post. Access to the hole is gained
by unscrewing the top part of the post far enough to reveal the hole underneath. Insert the stripped end
of the wire and tighten the top (nut) part of the binding post to secure the connection.
160SL
lue
series
b
160SL
160SL
160SL
controls controls
160SL
notes notes
160SL
160SL
160SL
Operations
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
160SL
Operations
Inspection Inspection
Operating Operating
Operating Operating
Connection
Connection
Installation
Installation
Technical
Technical
Introduction Introduction
to your system to your system
considerations
considerations
contents
contents
concept
concept
diagram
diagram
applications
applications
support and factory service
support and factory service
160SL
Specifications
Specifications
160SL
160SL
160SL
160SL
160SL
160SL
Manual
Manual
Design
Design
Block
Block
Controls
Controls
Advanced
Advanced
Warranty
Warranty
lue
series
b