Biamp advantage DLA93 User manual

DLA93
Digital-Logic
Automixer
Operation Manual
®
Biamp Systems, 10074 S.W. Arctic Drive, Beaverton, Oregon 97005 U.S.A. [phone] http://www.biamp.com
an affiliate of Rauland-Borg Corp.

1
DLA93
TABLE OF CONTENTS
Front & Rear Panel Features
Options
Remote Control
Logic Outputs
Applications
Block Diagram
Specifications
Warranty
pgs. 2 & 3
pgs. 4 & 5
pgs. 6 & 7
pgs. 8 & 9
pgs. 10~13
pg. 14
pg. 15
INTRODUCTION
The ADVANTAGE
®
DLA93 Digital-Logic Automixer provides nine input
channels and three independent outputs, with automatic mixing functions
controlled via microprocessor. Input functions such as automixing, phantom
power, high-pass filters, and output assignments are selectable on individual
channels. The DLA93 includes capabilities for remote control of inputs and
outputs, and linking of multiple units for system expansion or room combining.
DLA93 features include:
♦ eight mic/line input channels with pad, trim, & peak indicator
♦ balanced differential mic/line preamp circuitry (xfmr option)
♦ input & direct output for each channel on plug-in barrier strip
♦ patch insert point for each channel on TRS 1/4” phone jack
♦ phantom power & HPF switch selectable for each channel
♦ automatic mixing function switch selectable for each channel
♦ output bus assignments switch selectable for each channel
♦ level & tone controls, plus active indicator, for each channel
♦ additional auxiliary line input channel on plug-in barrier strip
♦ aux input switch selectable for balanced or L+R sum signals
♦ aux channel includes level, tone, HPF, & output assignment
♦ Main, Aux 1, & Aux 2 outputs with independent level control
♦ each output balanced on plug-in barrier strip (xfmr options)
♦ Aux 1 & Aux 2 switch selectable for pre or post automixing
♦ Main output leveler, plus compression on individual channels
♦ remote control of inputs/outputs, automixing, & combining
♦ logic outputs for active channel control of external switching
♦ expansion in & expansion out for linking of multiple DLA93s
♦ automixing, linking, & last mic on modes switch selectable
♦ active channel hold time switch selectable (0.4 or 1 second)
♦ 10-segment meter displays output level or gain reduction
♦ front panel security cover included to prevent tampering
♦ incorporates AES recommended grounding practices
♦ marked and UL / C-UL listed power source
♦ covered by Five-Year “Gold Seal” Warranty
?
After reading this manual, if you have any questions or need technical
assistance, please call Biamp Systems toll-free 1-800-826-1457.
☎

2
FRONT & REAR PANEL FEATURES
ADVANTAGE DLA93
Digital-Logic Automixer
thresholds
-15 -12 -9 -6 -3 0 6 9 12 on 3
Aux 1
active
active
active
active
active
active
active
active
high
compressor leveler
outputs
meter
leveler
gain reduction
active
defeat
o
leveler
hold
low
level
Channel 4
high
Aux Channel
low
level
high
Channel 3
low
level
high
Channel 2
low
level
high
Channel 1
low
level
high
Channel 8
low
level
high
Channel 7
low
level
high
Channel 6
low
level
high
Channel 5
low
level
+ + + ++ ++ ++ + level
Aux 2
level
Main
level
+ ++ ++ ++ +
output
24 6 8 101214161820
compressor
active
FRONT PANEL FEATURES
Channel Level Controls: These screwdriver adjustable controls
set the volume level for Channels 1~8 and the Aux Channel. Level
controls affect signals sent to Main, Aux 1, & Aux 2 outputs, as well
as Channel 1~8 Direct Outputs.
NOTE: Volume levels are also
affected by an internal VCA (post-Level), which performs
automixing, compression, & remote control at specified outputs.
Channel Low & High Controls: These screwdriver adjustable
controls set the tone for Channels 1~8 and the Aux Channel. Low
provides ±15dB of gain for frequencies below 50Hz (bass). High
provides ±15dB of gain for frequencies above 15kHz (treble).
Channel Active Indicators: These red LEDs indicate when
Channels 1~8 are active. If automixing is enabled, this indicator
will light only when sufficient signal is present to activate the
channel. If automixing is defeated, this indicator will remain lit.
Channel Compressor: Channels 1~8 each have their own
independent compressor circuit. The screwdriver adjustable
Threshold control sets one standard volume level at which any of
the channel compressors will be activated. The adjacent red LED
will light whenever any channel compressor circuit is activated.
Output Level Controls: These screwdriver adjustable controls
set the volume level for Main, Aux 1, & Aux 2 outputs. Main
volume level may also be affected by the Output Leveler circuit.
Output Leveler & Meter: The Main Output section includes a
Leveler circuit, which compensates for changes in the average
volume level. If the volume level increases, the Leveler reduces
gain. If the volume level decreases, the Leveler increasing gain. A
Leveler Hold circuit prevents gain changes during pauses, as
indicated by the adjacent red LED. The Meter will display either
output level or gain reduction, determined by the Meter Switch. To
set output level & Leveler operation: 1) Set the Meter Switch to
‘Output’. 2) Once channel levels are set, adjust the Main Level
control for desired level (peaks of +12dB on the Meter are
recommended). 3) Set the Meter Switch to ‘gain’. 4) Adjust
Leveler Threshold for amount of gain reduction (6~8dB on the
Meter is usually adequate). 5) Set Meter Switch back to ‘Output’
6) Re-adjust Main Level to compensate for gain reduction (use
Leveler On/Off Switch & Meter for comparison).
NOTE: The
Leveler may be defeated with the On/Off Switch, or simply by
setting the Threshold control fully clockwise.
Power Switch & On Indicator: When the Power Switch is
depressed, the adjacent red LED will light indicating power to the
mixer is On. Release the Power Switch to turn power off.
REAR PANEL FEATURES
NOTE: ‘Pre-VCA’ means signals are not affected by automixing,
compression, & remote control. ‘Post-VCA’ means they are.
Channel Input & Direct Output: These plug-in barrier strips
provide the balanced mic/line input to the respective channels. For
balanced input, wire high to (+), low to (-), and ground to (
ý
). For
unbalanced input, wire high to (+) and ground to both (-) & (
ý
).
Input isolation transformers are optional (see Options on page 4).
Unbalanced channel Direct Outputs (post-Level) are available
using (d out) & (
ý
). Direct Outputs are pre-VCA, but may be
changed to post-VCA (see Options on pg. 4).
Channel Trim, Pad, & +10 Indicator: The Trim controls adjust
gain at the respective inputs to compensate for different signal
levels. For best performance, set Trim so the +10 Indicator is
activated only by occasional peaks in signal level. Depress the
Pad switch when input signal levels exceed normal operating
range of the Trim control, or when line-level input is desired.
Channel Patch: These 3-conductor 1/4" phone jacks are for
connection of other Advantage products (or signal processors) to
the respective channels. Patch jacks are wired with Tip as send
(output), Ring as return (input), and Sleeve as a common ground.
Patch cables can be wired for direct output (pre-Level & pre-VCA).
Channel DIP Switches: These six-gang DIP switches assign
specific functions to the respective channels. To assign a function,
move the corresponding switch upwards. On turns the channel on
steadily (defeats automixing). P Pwr enables +24 Volt DC
phantom power. CAUTION: Assign P Pwr only on channels using
condenser microphones which require phantom power.
HPF
enables a high-pass filter (6dB/oct. @ 170Hz). Main sends post-
VCA signal from the channel to the Main output. Bus 2 sends pre-
VCA signal from the channel to Bus 2 (see Options on pg. 4). Bus
1 sends post-VCA channel signal to Bus 1 (see Options on pg. 4).
NOTE: Main, Bus 2, & Bus 1 signals are all affected by the
channel level controls (post-Level).
The factory default settings
are with all DIP switches down, except Main.

3
FRONT & REAR PANEL FEATURES
logic
outputs remote control
expansion out
hpf main bus2 bus1
last mic slave bus1
1.0 sec
bus2
expansion in
aux 1 aux 2 main
aux input
R
L
patch
trim
+10
trim
+10
patch
trim
+10
trim
+10
patch
patch
trim
+10
trim
+10
patch
trim
+10
trim
+10
pad
off
off
off
off
master
bus2
0.4 sec
bus1
aux 1 select
aux 2 select
output
MADE IN U.S.A.
BIAMP SYSTEMS
Portland, Oregon
an affiliate of Rauland-Borg Corp.
sum
bal
off
CH 7 CH 6
patch
CH 5
patchpatch
CH 4
CH 8
CH 2 CH 1
CH 3
main bus2 bus1 on p pwr
off
off
off off
auto
off hpf
main bus2 bus1
on
off
off
off off
auto
off hpf
p pwr
factory defaults
aux1 - bus1 (post gate)
aux2 - bus2 (pre gate)
on
auto
pad
pad
main bus2 bus1 on p pwr
off
off
off off
auto
off hpf
main bus2 bus1
on
off
off
off off
auto
off hpf
p pwr
pad
pad
main bus2 bus1 on p pwr
off
off
off off
auto
off hpf
main bus2 bus1
on
off
off
off off
auto
off hpf
p pwr
pad
pad
main bus2 bus1 on p pwr
off
off
off off
auto
off hpf
main bus2 bus1
on
off
off
off off
auto
off hpf
p pwr
pad
hold time
input
d out
input
d out
input
d out
input
d out
input
d out
input
d out
input
d out
input
d out
class 2 wiring
50/60 Hz
~
27V
27 watts, 1 A
Aux Input & Bal/Sum Switch: This plug-in barrier strip provides
the line-level input to the Aux Channel. The Bal/Sum Switch
selects either balanced (mono) or unbalanced (summing) input.
For balanced input, wire high to (+), low to (-), and ground to (
ý
).
For unbalanced input, wire highs to (L) & (R), and ground to (
ý
).
This can be a stereo signal, two mono signals, or a single mono
signal. Summing combines (L) & (R) into a single mono signal.
Aux DIP Switch: This four-gang DIP switch assigns specific
functions to the Aux Channel. To assign a function, move the
corresponding switch upwards. HPF enables a high-pass filter
(6dB/oct. @ 170Hz). Main sends Aux Channel signal to the Main
output. Bus 2 sends Aux Channel signal to Bus 2. Bus 1 sends
Aux Channel signal to Bus 1. NOTE: Main, Bus 2, & Bus 1 signals
are affected by the Aux Channel Level control (post-fader).
The
factory default settings are with all DIP switches down.
Master DIP Switches: This six-gang DIP switch assigns specific
functions to the mixer as a whole. To assign a function, move the
corresponding switch upwards. On turns Channels 1~8 on steadily
(automixing off). 1.0 Sec assigns a Hold Time of one second.
Hold Time selects how long an active automix channel will remain
on, once signal is no longer present in the channel. Last Mic
allows the most recently active automix channel to remain on
(without signal present) until the next automix channel becomes
active. Slave sets the mixer as a secondary unit, when linking
multiple mixers within a system (see Expansion Out & Expansion
In). Bus 1 sends the Bus 1 (post-VCA) signal to the Aux 2 output
(see Options on pg. 4). Bus 2 sends the Bus 2 (pre-VCA) signal to
the Aux 1 output (see Options on pg. 4). The factory default
settings are with all DIP switches down.
Expansion Out & Expansion In: These 20-pin headers are for
linking multiple mixers within a system. A 20-pin cable harness is
provided with each mixer. To link mixers, simply connect the cable
harness from Expansion In of one mixer to Expansion Out of the
next mixer. Linking mixers increases input capacity and allows
room combining. The first mixer within a system is assigned as
the ‘master’. The ‘master’ collects audio signals & control data
from the other mixers, which are assigned as ‘slaves’. They in turn
receive appropriate signals & data from the ‘master’. Main, Aux 1,
& Aux 2 output signals, plus NOM attenuation, are common to all
mixers. However, each mixer has independent Output Level,
Remote Control, & Leveling. In room combining applications, the
‘master’/’slave’ assignments are changed via remote switches or
contact-closures (see Remote Control).
Remote Control: This 15-pin Sub-D connector allows remote
control of the mixer. Level control of Channels 1~8, Aux Channel,
Main Ouput, & Aux 1 Output are provided, as well as selection of
automixing & master/slave modes (see Remote Control on pg. 6).
Logic Outputs: This 9-pin Sub-D connector provides Logic
Outputs from Channels 1~8, plus a common ground. When a
channel becomes active, the corresponding Logic Output goes on.
Logic Outputs may be used to control external switching circuits,
such as relays or other Advantage products. These outputs are
typically used to turn off speakers or select cameras when certain
microphones are active (see Logic Outputs on pg. 8).
Main Output: This plug-in barrier strip provides the balanced
Main output from the DLA93. For balanced output, wire high to
(+), low to (-), and ground to (
ý
). For unbalanced output, wire high
to (+) and ground to both (-) & (
ý
). An isolation transformer is
optional for Main Output (see Options on pg. 4). Main Output
signals are always post-VCA from the channels. When multiple
DLA93s are used, Main Output signal is affected by Expansion Out
& Expansion In (see above).
Aux 1 Output: This plug-in barrier strip provides the balanced
Aux 1 output from the DLA93. For balanced output, wire high to
(+), low to (-), and ground to (
ý
). For unbalanced output, wire high
to (+) and ground to both (-) & (
ý
). An isolation transformer is
optional for Aux 1 Output (see Options on pg. 4). Aux 1 Output
signals are normally post-VCA from the channels, but may be
changed to pre-VCA (see Master DIP Switches above, and
Options on pg. 4). When multiple DLA93s are used, Aux 1 Output
signal is affected by Expansion Out & Expansion In (see above).
Aux 2 Output: This plug-in barrier strip provides the balanced
Aux 2 output from the DLA93. For balanced output, wire high to
(+), low to (-), and ground to (
ý
). For unbalanced output, wire high
to (+) and ground to both (-) & (
ý
). Aux 2 Output signals are
normally pre-VCA from the channels, but may be changed to post-
VCA (see Master DIP Switches above, and Options on pg. 4).
When multiple DLA93s are used, Aux 2 Output signal is affected
by Expansion Out & Expansion In (see above).
AC Power Cord: The transformer provides 27 VAC (1A max.) to
the DLA93, and is detachable via a 5-pin DIN connector. If blown,
two internal ‘self-resetting’ fuses will attempt to re-set after a short
period. Continued blowing of these fuses may be an indication
that the DLA93 requires service.

4
OPTIONS
To disassemble the DLA93 and perform any of the following modifications: 1) Disconnect the DLA93 from AC power. 2) Remove the
front panel (three screws along top edge & three screws along bottom edge). 3) Remove chassis top (two screws along bottom edge of
each side panel & three screws along back edge of top panel). 4) Remove top circuit board (six screws along front edge, six screws along
back edge, one screw near center towards right side & three wire harnesses on right edge). 5) Detach bottom circuit board (six stand-offs
along front edge, six stand-offs along back edge, & one stand-off near center towards right side). The bottom circuit board cannot be
removed without also unsoldering the AC power transformer wires. Instead, the circuit board may simply be tilted upwards to access the
bottom for soldering components. The following descriptions & diagrams are oriented with the rear panel towards the user.
Input Isolation Transformers: Input isolation transformers are a user installed option for Channels 1~8 (Model IT-A #909-0010-01).
To install input transformers: 1) Locate transformer positions on the circuit boards, in front of each Input connector (T101 for Channel 1;
T201 for Channel 2; etc.). See diagram on next page. Channels 1~4 are on top circuit board. Channels 5~8 are on bottom circuit board.
2) Remove two jumpers (0 ohm resistors) from each transformer position (R104 & R106 for Channel 1; R204 & R206 for Channel 2; etc.).
3) Insert the transformer pins through the holes on the top side of the circuit board, with pin 1 (red dot) of each transformer corresponding
to the square solder pad. 4) Solder all six pins on each transformer, at the under-side of the circuit board.
Output Isolation Transformers: Output isolation transformers are a user installed option for Main & Aux 1 (Model IT-B #909-0019-00).
To install output transformers: 1) Locate transformer positions on the bottom circuit board, in front of the Expansion In connector and the
Master DIP switches (T9 for Main; T10 for Aux 1). See diagram on next page. 2) Remove two jumpers (0 ohm resistors) from each
transformer position (J201 & J202 for Main; J101 & J102 for Aux 1). 3) Install jumper (0 ohm resistor) at new position (J203 for Main; J103
for Aux 1). Use jumpers (0 ohm resistors) previously removed. 4) Insert the transformer pins through the holes on the top side of the
circuit board, with pin 1 (red dot) of each transformer corresponding to the square solder pad. 5) Solder all six pins on each transformer,
and both leads of each new jumper, at the under-side of the circuit board.
Channel Direct Output Pre/Post Jumpers: From the factory, the channel Direct Output signals are pre-VCA (not affected by automixing,
compression, or remote control). However, each channel Direct Output may be individually modified to provide post-VCA signal (including
automixing, compression, & remote control).
To convert Direct Outputs to post-VCA: 1) Locate jumper positions on the circuit boards, in the second group of resistors behind each
channel High control (J103 & J104 for Channel 1; J203 & J204 for Channel 2; etc.). See diagram on next page. Channels 1~4 are on top
circuit board. Channels 5~8 are on bottom circuit board. 2) Move existing jumper (0 ohm resistor) to the vacant ‘POST’ position (J103 to
J104 for Channel 1; J203 to J204 for Channel 2; etc.). 3) Solder both leads of each jumper, at the under-side of the circuit board.
Channel Bus 1 & Bus 2 Pre/Post Jumpers: From the factory, channel signals assigned to Bus 1 are post-VCA (affected by automixing,
compression, & remote control) and channel signals assigned to Bus 2 are pre-VCA (not affected by automixing, compression, & remote
control). However, each channel may be individually modified to provide pre-VCA signal to Bus 1 and/or post-VCA signal to Bus 2.
To convert Bus 1 to pre-VCA: 1) Locate jumper positions on the circuit boards, in the second group of resistors behind each channel High
control (J107 & J108 for Channel 1; J207 & J208 for Channel 2; etc.). See diagram on next page. Channels 1~4 are on top circuit board.
Channels 5~8 are on bottom circuit board. 2) Move existing jumper (0 ohm resistor) to the vacant ‘PRE’ position (J108 to J107 for
Channel 1; J208 to J207 for Channel 2; etc.). 3) Solder both leads of each jumper, at the under-side of the circuit board.
To convert Bus 2 signal to post-VCA: 1) Locate jumper positions on the circuit boards, in the second group of resistors behind each
channel High control (J105 & J106 for Channel 1; J205 & J206 for Channel 2; etc.). See diagram on next page. Channels 1~4 are on top
circuit board. Channels 5~8 are on bottom circuit board. 2) Move existing jumper (0 ohm resistor) to the vacant ‘POST’ position (J105 to
J106 for Channel 1; J205 to J206 for Channel 2; etc.). 3) Solder both leads of each jumper, at the under-side of the circuit board.
Aux Input Bus 1 & Bus 2 Pre/Post Jumpers: From the factory, Aux Input signals assigned to Bus 1 are post-VCA (affected by remote
control) and Aux Input signals assigned to Bus 2 are pre-VCA (not affected by remote control). However, the Aux Input may be modified to
provide pre-VCA signal to Bus 1 and/or post-VCA signal to Bus 2.
To convert Bus 1 to pre-VCA: 1) Locate jumper positions near the center of the top circuit boards, in front of the Aux Input connector
(J903 & J904). See diagram on next page. 2) Move existing jumper (0 ohm resistor) to the vacant ‘PRE’ position (J904 to J903). 3)
Solder both leads of the jumper, at the under-side of the circuit board.
To convert Bus 2 signal to post-VCA: 1) Locate jumper positions near the center of the top circuit boards, in front of the Aux Input
connector (J901 & J902). See diagram on next page. 2) Move existing jumper (0 ohm resistor) to the vacant ‘POST’ position (J901 to
J902). 3) Solder both leads of the jumper, at the under-side of the circuit board.

5
OPTIONS
Input Isolation Transformers
T101
Patch
jack
rear panel
R106
R104
LED Input
connector
Output Isolation Transformers
J103
J101
J102
J201
J202
J203
T9 T10
DIP
switches
rear panel
Expansion In
connector
Channel
Direct Output
and
Bus 1 & Bus 2
Pre/Post Jumpers
J408
J407
J406
J405
J404
J403
PRE
POST
POST
BUS1
BUS2
D OUT
Aux Input
Bus 1 & Bus 2
Pre/Post Jumpers
J901
J902
J903
J904
BUS2
BUS1
POST
PRE

6
REMOTE CONTROL
The DLA93 provides remote control terminals on a rear panel 15-pin Subminiature D (female) connector. Remote Control can be used
with devices such as switches, potentiometers, resistors, diodes, and even Logic Outputs to perform a variety of remote control functions.
These devices may be wired up to 2000 feet from the DLA93, and can be configured for functions such as: level adjustment & muting for
individual or grouped inputs/outputs; manual/automatic ‘chairman override’ of multiple inputs; manual/automatic ‘page-override’ of music
input; multi-level ‘priority override’; selection of automatic/manual mixing; room combining; etc. See diagrams on next page for some
examples of remote control wiring for specific applications.
Remote Control terminals are provided for Channels 1~8, Aux Channel, Main Output, and Aux 1 Output (see diagram below). These
terminals have internal pull-up resistors, which keep them at a high idle state of +10 Volts. Therefore, no Remote Control connections are
necessary to keep these signals turned on. However, a variable control voltage (0~+10 VDC) can be used to control these signal levels
(+10 VDC = unity gain; 0 VDC = -80dB). The DLA93 provides +10V and ground terminals (for use with potentiometers), but an external
‘ramp’ voltage may be used instead. Potentiometers should be 25k
Ω linear taper (Biamp #170-0001-20), and are wired with the high-side
to +10V, the wiper to the desired control terminal(s), and the low-side to ground (see diagrams on next page). The wiper of a single
potentiometer may be wired to multiple control terminals (to control a group of signals). However, wipers from multiple potentiometers
should not be connected to a single control terminal (causes undesirable interaction). Switches, Logic Outputs, or other contact-closures
are used to provide muting of the input/output signals, by simply shorting the respective control terminal(s) to ground (see diagrams on
next page). A switch may be wired to multiple control terminals (to mute a group of signals). Multiple switches may be wired to a single
control terminal, but if multiple switches are connected to multiple control terminals a diode matrix may be necessary (see diagram on next
page). The combination of potentiometer & switch can be used to perform level adjustment & muting, or to provide an adjustable amount
of ‘ducking’ attenuation. Use of the DLA93 Logic Outputs in conjunction with the Remote Control terminals can provide various ‘automatic’
functions. Many other possible uses of the Remote Control terminals exist, which are not mentioned here.
Two additional Remote Control terminals are provided, which allow master/slave assignment and selection of automatic/manual mixing.
These terminals have internal pull-up resistors, which keep them at a high idle state of +5 Volts. Switches or other contact-closures are
used to short these terminals to ground. The master/slave terminal provides the same function as the ‘slave’ switch on the DLA93 rear
panel (see Master DIP Switches on pg. 3).
NOTE: The rear panel DIP switch must be in the down (‘master’) position for the Remote
Control terminal to function.
When multiple DLA93s are linked together, shorting the master/slave terminal to ground assigns the DLA93
as a ‘slave’ unit. This is effective in room combining applications, where the sound system can be configured manually via a remote switch
panel or automatically via contact-closures on the room partitions (see diagram on next page). The auto/manual terminal provides the
same function as the ‘on’ switch on the DLA93 rear panel (see Master DIP Switches on pg. 3).
NOTE: The rear panel DIP switch must be
in the down (‘auto’) position for the Remote Control terminal to function.
Shorting the auto/manual terminal to ground selects manual
mixing (defeats automatic mixing). This is effective for selecting attended or un-attended operation of the DLA93 (see diagram on next
page). It is also possible to select automatic mixing (to manage increased inputs) only when multiple DLA93s are ‘combined’.
remote control pin number
channel 1
channel 2
channel 3
channel 4
channel 5
pin #1
pin #2
pin #3
pin #4
pin #5
pin #6
pin #7
pin #8
pin #9
channel 6
channel 7
channel 8
aux channel pin #10
main output pin #11
aux 1 output pin #12
+10V pin #13
master/slave pin #14
auto/manual pin #15
ground
remote
control
12345678 9
101112131415
15-pin cable-end
1
9
10 11 12
5
4
3
2
13 14 15
8
7
6

7
REMOTE CONTROL
12345678 9
101112131415
25k
linear
Channel 1 Level
12345678 9
101112131415
25k
linear
Channels 1~4 Group Level
12345678 9
101112131415
25k
linear
Main Output Level
12345678 9
101112131415
Channel 1 Mute
12345678 9
101112131415
Channels 2~8 Group Mute 'Override'
12345678 9
101112131415
25k
linear
Rooms
A + B
(slave)
Rooms
B + C
(slave)
Rooms
C + D
(slave)
Channel 1 Level & Mute
(manual)
DLA93
(auto)
12345678 9
101112131415
Automatic/Manual Mixing Switch
DLA93
Room A
(master)
DLA93
Room B
(master)
DLA93
Room C
(master)
DLA93
Room D
(master)
12345678 9
101112131415
Master/Slave 'Room Combining' Switches
12345678 9
101112131415
12345678 9
101112131415
12345678 9
101112131415
12345678 9
101112131415
25k
linear
(trim)
Channel 1 Adjustable Mute 'Ducking'
mute 2~8
(mic 1) mute 3~8 (mic 2) mute 4~8 (mic 3)
12345678 9
101112131415
Channels 1~3 Multi-Priority Mute 'Page Override'

8
LOGIC OUTPUTS
The DLA93 provides eight logic outputs on a rear panel 9-pin Subminiature D (male) connector. Logic Outputs can be used to control
external switching circuits (such as relays) for speakers, cameras, indicators, etc. The DLA93 Logic Outputs are most often used, in
conjunction with external relays, to turn off specific speakers when nearby microphones are active (reducing feedback problems). For
example, if a speaker is located directly above microphone #1, the Logic Output for Channel 1 of the DLA93 can be used to turn off that
speaker relay when microphone #1 is active (see diagram on next page). The Logic Outputs can also be combined (wired in parallel) to
control a single circuit. For example, a speaker relay could be turned off when either microphone #1 or microphone #2 is active. In
addition to speaker relays, the DLA93 Logic Outputs may be used to control external indicator lights (see diagram on next page). Another
common application for Logic Outputs is to control video cameras. Different cameras could be activated depending upon which
microphone (or group of microphones) is currently active. Cameras can be selected (using a video switcher such as a VSX41) and/or
camera presets may be triggered (using a ‘pan/tilt/zoom’ camera system). The DLA93 Logic Outputs may also be used in conjunction with
the DLA93 Remote Control to perform such functions as ‘automatic priority’, which allows a microphone (or group of microphones) to be
muted whenever specific ‘priority’ microphones are active (see diagram on next page). The Logic Output for the ‘priority’ microphone is
wired to the Remote Control terminals for the microphones to be muted. A similar approach is useful for ‘page-over-music’ applications.
However, in this case the Logic Outputs from multiple ‘paging’ microphones are wired to the Remote Control terminal for a single music
source to be muted. Multi-level priority schemes are also possible, but may require a diode matrix. These ‘priority’ applications require
Last Mic to be disabled. Of course, manual muting of microphones is also possible (see Remote Control on page 6).
The DLA93 Logic Outputs are ‘open collector’ outputs. Each Logic Output is an NPN transistor with the collector being the output and the
emitter being ground (see diagram on next page). When a Logic Output is turned on, the transistor provides a path for DC current to flow.
The Logic Outputs do not provide any voltage or current. They act only as switches (with a common ground return). To activate external
relays, an external power supply must be used (see diagram on next page). The Logic Output transistors are rated up to a maximum of 24
VDC and 50 mA per output (24 volt relay coils maximum). However, +12 Volts DC is sufficient power for most applications. When using
the Logic Outputs to control relays, protection diodes must be used to suppress high voltage transients that are generated when the relays
turn off (see diagram on next page). Any of the 1N4004 family of diodes (1N4001, 1N4002, 1N4003, 1N4004, 1N4005, 1N4006, 1N4007,
or equivalent) will provide proper protection. A 12 Volt Power Supply (#909-0011-00), 12 Volt Relays (#520-0064-00), and 1N4004 Diodes
(#190-0003-09) are available from Biamp Systems. When a Logic Output goes on, the associated relay may be wired to perform on, off, or
’A/B’ switching functions. To use logic ‘on’ to turn on (or activate) a device, wire across the ‘normally open’ relay contacts, in series with
the device (or control voltage source). To use logic ‘on’ to select between ‘A’ or ‘B’ signals (inputs or outputs), wire one signal to the
‘normally closed’ relay terminal and the other signal to the ‘normally open’ relay terminal, with the common relay terminal providing the feed
(input or output).
The 9-pin Subminiature D connector used for the DLA93 Logic Outputs is the same type of connector used for RS-232 communications
ports on IBM compatible computers (PCs). Most retail computer stores carry ‘modem’ cables for the IBM PC. These cables have a 9-pin
female connector on one end and a 25-pin male connector on the other end. If the cable has full RS-232 modem support, it may be used
as a Logic Output cable for the DLA93 by simply cutting off the end with the 25-pin connector. A cable that provides full RS-232 modem
support will have either 9 conductors or 8 conductors plus a shield. Pin #5 on the DLA93 was chosen as ground because many of the pre-
fabricated modem cables connect pin #5 to the cable shield (IBM AT uses pin #5 as ground). An ohm-meter can be used to easily
determine which wires go to which pins of the 9-pin female connector. Of course, a custom cable may be created by simply wiring to the
proper pins of a female 9-pin Subminiature D cable-end connector.
logic out pin number
channel 1
channel 2
channel 3
channel 4
ground
pin #1
pin #2
pin #3
pin #4
pin #5
pin #6
pin #7
pin #8
pin #9
channel 5
channel 6
channel 7
channel 8
9-pin cable-end
5
98761
2
3
4
logic
outputs
12345
6789

9
LOGIC OUTPUTS
Logic/Relay circuit
+12 Volts DC
Power Supply
−+
Logic Output #1
1N4004
Diode
Contacts
Coil
common
normally closed
normally open
DLA93
Pin #1
Pin #5
12V Relay
Logic Outputs controlling indicators
DLA93 +12 Volts DC
Power Supply
−+
Logic Output #1
Pin #1
Pin #5
LED
Indicator Panel
1.2k ohms
Channel 1 ‘automatic priority’ over Channels 2~8
logic
outputs remote control
112345678515
ground