USL CM-680 - Manual (Page 6)

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CM-680 I NSTRUCTION M ANUAL Ultra Stereo Labs, Inc.
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CM-680 I NSTRUCTION M ANUAL Ultra Stereo Labs, Inc.
CM-680 Front Panel
PROCESSOR
AMPLIFIERS
VOLUME
2
8
3 1
7 9
10
0 4
5
6
CHANNEL SELECT
VU
TEST
POWER
L
C
R
SW
Ls
Rs
BSl
BSr
CM-680
EIGHT CHANNEL MONITOR/XOVER
+3 +2 +1 0 -1 -3 -5 -7
-10 -20 -30 -40
12
3
4
5
6
7
8
9
1.
C
hannel
select
buttons
- pressing
a
Channel
S
elect
Button
causes
the
corresponding
LED
to
illuminate
and the signal from that channel to be monitored. Any combination of eight channels can be selected. 2. Internal Digital or Analog Crossover Access Cover
.
3.
C
rossover
Bypass
Switch
- Switching
this
will
cause
the
internal
crossover
to
be
bypassed
or
engaged
and the condition will be indicated by its appropriate LED. 4. V
olume Control - controls the volume of the internal or external speaker
. The volume control has
no ef
fect on the VU Bargraph display
.
5. Processor/Amplifier Selector Switch - selects either the inputs from the cinema processor or power amplifiers for monitoring. 6. VU Bargraph - displays the level of the selected channels. The VU Bargraph may be calibrated by the rear panel trim adjustment (Figure 2). The VU Bargraph operates independently of the volume control (4). 7. T
est Jack - permits monitoring of the audio output of the CM-680. Inserting a mono or stereo 1/4”
phone plug here disables the internal speaker and routes the audio output to the T
est Jack. Do
not connect any device here with less than 8 Ohms impedance. 8. Internal Speaker 9. Power Switch
Pin # Function
1 GND
2 Left
3 N/C
4 N/C
5 Center
6 N/C
7 N/C
8 Right
9 N/C
10 GND
11 GND
12 GND
13 N/C
14 GND
15 Left LF
16 Left HF
17 GND
18 Right LF
19 Right HF
20 GND
21 Center LF
22 Center HF
23 Surr L
24 Surr R
25 Sub
Main
Processor
Outputs
N/C
N/C
Bsl -
N/C
N/C
Bsr -
Chassis Gnd
N/C
N/C
Ls -
Rs -
N/C
N/C
N/C
N/C
Bsl +
N/C
N/C
Bsr +
N/C
N/C
N/C
Ls +
Rs +
N/C
Optional
Processor
Outputs
Function
DB-25
Connector Pinout
Setting Monitor and Bargraph Levels:
Set the processor main fader and amplifier levels so the house speakers
are playing back at the normal listening level. Select some source material
like pink noise.
Set the “Processor/Amplifier” switch to “Processor”. With the monitor
volume to “7”, adjust the “Processor” trimpot for a comfortable listening
level. Set the bargraph trimpot for a reading in the middle range.
Set the “Processor/Amplifier” switch to “Amplifier”, adjust the amplifier
trimpot so the level matches the processor level.
Figure 1
Figure 5
CM-680 HD 15 pin outs
Typical per connector
Pin # Name Pin # Name Pin # Name
1 Band A (1), - 6 Chassis Gnd 11 Band B (2), -
Signal Signal
2 NC 7 Band A (1), + Signal 12 NC
3 Band A, Vmon 8 Band B (2), + Signal 13 Band B, Vmon
(Amp returns) (Amp returns)
4 Band A, Imon 9 NC 14 Band B, Imon
5 NC 10 Signal Ground 15 NC