- 5 -
CM-680
I
NSTRUCTION
M
ANUAL
Ultra Stereo Labs, Inc.
- 10 -
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.
Channel
select
buttons
- pressing
a
Channel
Select
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.
Crossover
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
