JTS CS-8 User manual

59508-023-03

CS-8
AUTOMATIC MICROPHONE MIXER

Important Caution
Features
Parts Identication
Installation and Operation
Internal Setup
Application
Specications
01
01
02
05
07
08
09

1
Important Caution
Features
Always make all connections before plugging the unit into an AC power outlet.•
Do not leave the devices in a place with high temperature or high humidity.•
Always do not handle the power cord with wet hands.•
Keepthedevicesawayfromreandheatsources.•
The CS-8 Automatic Mixer provides great convenience to sound reinforcement
installation with any size and any combination. Full feature design includes.
Daisy-chain with unlimited number of the CS-8.•
Three operation modes: one-channel-at-a time, all active or priority.•
Switchable inputs accept microphones or line level devices; mic- or line level out.•
Individual gain control and phantom power for each channel.•
Last In stays on for continuous ambience sound.•
Control voltage provided to trigger external device such as speaker switching and•
camera switching.
The outstanding performance enables effective managing of multi-microphone
installations including corporate boardrooms, conference rooms, government buildings,
houses of worship, classrooms, and many others.

2
Parts Identication
Front panel
Power switch
Power ON/OFF indicator
Input level controls: Adjust the sensitivity of microphone input.
Active channel LED indicator: Indicate a channel which is “active”
Output level LED meter: Indicate RMS output level of the Automatic Mixer.
Peak LED meter: When the output reaches distortion level the LED will light.
Priority switches: The factory pre-set is in “Down” position. A switch in the “Up” position
allows the respective microphone priority over other microphones.
Any combination of “Priority/non-priority” is allowed.
MIX level control: The factory setting is fully clockwise. Turn counter-clockwise to
reduce the mixer’s output.
THreshold/BYPASS control: Set the reference level that must be exceeded for a
microphone to be considered “in use”, and prevent the ambient noise from accidentally
triggering the microphones. “BYPASS” Mode will bypass all automatic function in the mixer
system. All microphones are in “ON” status.
Lockout LED indicator: When “Lockout LED indicator” lights, the automatic function is
activated to select a proper microphone.
MIC 1/2: When THRESHHOLD is ON, push down MIC1/2, the COMMON LED will light on.
Then INPUT 1 and INPUT 2 will constantly have the same lowest priority which is good for
background music. It is recommended to input a stereo signal into MIC 1 and MIC 2 as left
and right channel.
LEVEL 5LEVEL 6LEVEL 7LEVEL 8LEVEL 1LEVEL 2LEVEL 3LEVEL 4 MIX LEVEL
AUTOMATIC MICROPHONE MIXER
THRESHOLD
MIC 1/2
POWER
OUTPUT LEVEL
CHANNEL ACTIVE
PRIORITY
LOCKOUT BYPASS
CS-8
-10 -50 36PEAK
3 8 5 6 2 1
4 7 10 911
1
2
3
4
5
6
7
8
9
10
11

3
VOLTAGE OUTPUT
GND
MIX OUT MIC 8MIC 7 MIC 6MIC 5 MIC 4MIC 3 MIC 2MIC 1 R L
LINK IN LINK OUT
DC 18V
RoHS
conform
1 A
Important Caution
Rear panel
Power supply: Require 18VDC, 1 A
Link In/Out: For the daisy-chain multiple mixer system, the signal will pass through “Link In/
Out” connectors.
Voltage output: Provide 0 or +4VDC (active high) to trigger external device for other
applications.
MIX output: Preset balanced XLR line-level output. Can be switched to mic-level output via
internal switch. (Page 7)
MIC. inputs: Balanced XLR microphone input for dynamic or condenser microphones. Can
be switched to line-level input via internal switches. (Page 7) Preset phantom power on.
RCA INPUT (17): When use RCA input please switch internal SW33 and SW34 to RCA
position. Then the MIC1 and MIC 2 connecters will be bypassed.
12 13
14 15 16
12
13
14
15
16
17
17

4
Accessories
AC/DC Adapter: Input:AC100~240V,0.48A
Output:18V, 1.1A
D8P-1 extension cable
RM-12 Rack mount kit
18
19
20
18
19
20

5
Installation and Operation
CS-8 Automatic mixer setup guides
Turn “ Threshold/BYPASS control” at minimum threshold, immediately clockwise of the1.
“BYPASS” setting.
Set all “Priority switches” to “down” position.2.
Turn all eight “Input level controls” fully counter-clockwise.3.
Connect the “AC/DC Adapter” to the Automatic mixer and the outlet.4.
Turn “Power switch” on. The “Power switch indicator” will light, and start self-test that5.
would turn each microphone “on” and “off” sequentially.
Connect a microphone to “MIC 1” input and turn the “Input level control” to the “nine6.
o’clock” position. The “Active channel LED indicator” will light when the microphone is
active.
According to the “Output level LED meter”, adjust “Input level control” to a proper7.
position. (Peak at rightest)
Gradually increase “Threshold/BYPASS control” until the “Lockout LED indicator”8.
asheswhenspeakingatanormallevel,preventingambientnoisefromaccidentally
triggering the microphone.
Plug in up to seven microphones and adjust each respective “Input level control”. It’s9.
not necessary to readjust the “THreshold/BYPASS control”.
The system allows only one “non-priority” microphone to be used at one time. Only10.
when one microphone stops using, the other one could be used.
Priority could be assigned to one or more microphone by moving “Priority switches” to11.
“Up” position. Any microphone assigned to this setting will not be locked out by any
other microphones.
“BYPASS” mode can be used at any time by simply switching “Threshold/BYPASS12.
control” to “BYPASS” position. In this mode, the unit will function as a conventional
eight-channel microphone mixer and all automatic functions are bypassed.

6
Figure 1
<< SWITCH CONDENSER OR DYNAMIC MIC
<< RCA OR MIC
SW 33~34
SW 9~16
SW 1~8
SW 17~24 << MIC IN ATT (0dB,-10dB,-20dB)
<< SWITCH FOR MIC / LINE
<< ATTENUATION
(-10dB,-15dB,-20dB)
SWITCH FOR MIC / LINE >>
48
48
SW 35
SW 25~32

7
Internal Setup
CS-8 Automatic Mixer has a substantial gain range, allowing it to accept a wide variety
of microphones. These settings are located inside the unit. Before setting, please
unplugged the power cord, and remove the two screws on each side of the unit, and then
remove the top cover. (Figure 1)
Preamplier Gain
MIC IN ATT (Factory pre-set is -10dB)•
The internal switches are located on the circuit board designated by “SW 17~24”, for
MIC 1~8 respectively. Moving the switch will change the gain by 10dB (From 0dB,
-10dB or -20dB).
Input attenuation switches (Factory pre-set is 0dB)•
Toacceptthe“line-level”input,thepreampliergainmaybereducedfurther.By
changing the switches designated by “SW 1~8”, it will cause 50dB gain reduction for
MIC 1~8 respectively.
Notice: Combination of mic in ATT and Input attenuation switches would reduce
sensitivity by up to 70dB for each MIC input.
Output Attenuation (Factory pre-set is at line-level of 0dB)
The internal switch are located on the circuit board designated by “SW35”. Changing the
setting to “MIC” would cause a 50dB reduction in output.
Microphone Attenuation (Factory pre-set is -10dB Comparing with priority mic)
If the number of microphones in use is high, it may increase the amount of “Microphone
attenuation” of each microphone to maintain the total ambient noise level low. The
“Microphone Attenuation switch” has three settings of -10dB, -15dB, and -20dB. The
internal switches are located on the circuit board (CS-8 Main) designated by “SW 25~32”.
Changing the setting to “-15 or -20” will cause the attenuation by “-15dB or -20dB”
respectively.
Phantom Power (Factory pre-set is “+48V”)
Each of “MIC input” supplies +48V phantom power. If it’s required to disable the phantom
power, change the setting of these switches to “OFF”. The switches are located in the
internal circuit board designated by “SW 9~16” for MIC 1~8 respectively.
RCA and MIC
This switch is to change the input between MIC1/MIC2 and RCA R/ RCA L.

8
LAST UNIT
Master volume control is assigned to
the last unit in the whole installation.
CS-8
CS-8
Mixer
LINE IN
D8P-1
CS-8
D8P-1
CS-8
D8P-1
Setting for each microphone input
LINE OUT
Figure 2
Internal Setup
Daisy-chaining mixer
When more than eight microphones are used, the system could daisy-chain multiple CS-8
Automatic Mixers together through “Link In/Out” on the rear panel. Connect the #1 Mixer’s “Link
Out” to the #2 Mixer’s “Link In” with “D8P-1” extension cable. Repeat it to connect enough Mixers
for installation.
The last unit in the chain contains audio from all preceding mixers, and the combined output is
then taken from the last mixer in the chain. (Figure 2)
Notice 1: Because the “Lockout information” is passed through “Link In/Out”, the whole chain
system has only one microphone will stay on.
Notice 2: One or more mixers could be changed to “BYPASS” mode without affecting automatic
functions in other mixers in the entire daisy-chain system.
Rack Mounting
Combined with “RM-12” rack mount kit, the CS-8 Automatic Mixer could be mounted in a 1U rack
space.

9
Specications
Voltage Output
When a microphone channel turn “on”, as indicated by a “Active channel LED indicator” on the
front panel, the channel’s associated “Voltage Output” goes “high” (+4 VDC). This signal can be
used by different applications, such as select video cameras.
Power Supply: 18VDC, 1A
Power Consumption: 18 Watts (include Adapter)
Fuse: 1A 250V
Impedance
Input
Type: XLR
Mic:4.7KΩ
Line:20KΩ
Output
Type: XLR
Mic:300Ω
Line:200Ω
Maximum Output Level
Line: >+17 dB
MaximumGain:≥70dB
Internal Controls
Mic/Line attenuation: -50dB
Phantom Power: +48V
MIC IN ATT: 0dB, -10dB, -20dB
MIC Attenuation: -10dB, -15dB, -20dB
Output Attenuation: -50dB
Frequency Response: 35~20,000 Hz
THD% Input(1 KHz -50dB): <0.06%
Signal-To-Noise Ratio: >70dB
Voltage Output: : +4VDC±0.3V
Weight: 2.25kg
Dimensions: 420.6mm(L)*198.5mm(W)
*44.2mm(H)
C1815
1
2
3
4
15K
51Ω 1/4W
+12V
1N4148
RELAY:VDC +12V
1.2K
15K
C1815
LED
+5V
GND
5
6
7
8
Control Voltage
Control Voltage
1
2
3
4
GND
5
6
7
8
Driving One device
(Larger power)
Driving One LED