Crest audio NC-SLM DATASHEET
Power
Processing
POWER/OUTPUT MODULE
Modules
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
Load Monitoring, Sequential Turn-On/Off, NexSys®power supply,
NC-SLM
Product Information
The NC-SLM Module fits in the Power/Output bay located on the rear
panel of Crest Audio CKS, CKV & CKX Series Power Processing
amplifiers. It features full NexSys circuitry for Load Monitoring, LineLevel Output Audio Return and AC Voltage and Current. Load
Monitoring is a powerful feature that permits measurement plots to be
made of the load (speaker) impedance across frequency ranges on each
amp channel. These can be stored and compared to plots run at a later
date to detect changes or problems with the load. Activation of the
Audio Monitor function by NexSys software places the output of the
selected channel on the Audio Return connector. A balanced line is run
between amplifiers and back to the control position where audio is monitored.
Features
• NexSys compatible • Simple setup, tamper-proof configuration
• Signal chassis ground lift jumper • Sequential turn-on/off initiated by NexSys or a hard closure
• Includes NexSys monitoring of load, line-level output audio and AC voltage and current
• Amplifier output terminals on barrier strip with 0.44" (11mm) screw spacing and 0.32" (8mm) lug spacing
• 5mm 6-pin Phoenix connector for sequential turn-on/off (STO) connection
• 5mm 3-pin balanced Phoenix connector for NexSys-initiated line-level output audio return
• With NexSys-initiated STO, user-programmable turn-on and turn-off delay times
AC Voltage & Current Monitor, Audio Return
Due to potential level differences and the effect of the driver’s frequency
band and tone, only one channel in a system can be placed on the Audio
Return bus at any time.
NC-SLM also provides for NexSys initiation or hard closure activation
of Sequential Turn-On/Off (STO). Being self-powered prior to the
amplifier power-on, the NC-SLM does not require an external DC supply to activate Sequential Turn-On/Off. The front panel power activation
switch must be in the “Remote” position for the NC-SLM to initiate or
be part of a Turn-On/Off sequence. NC-SLM requires both an NC-IPN
(or any other programmable Input Processor NC Module), and an NCNXS Module for operation.
NC-SLM
connections
Sequential
Turn-On/Off
connection to
other
amplifiers
Off
LISTED 8B42
COMMERCIAL
POWER
AMPLIFIER
120V~60 Hz 15A
On
Com
Com
-
+
-
-
On
Sequential
Turn-On
In
On
Com
Off
On
Com
Off
Out
Model
NC-SLM
Off
CLASS 2
WIRING MAY
BE USED
Output
–
A
+
+
B
–
Signal
Ground
Lift
Jumper
+
+
–
Audio Return
USA-specification amplifier shown
Architects and Engineers Specifications - NC-SLM.
The module shall plug into Crest Audio CKS or CKV Power Processing amplifiers in the
Power/Output bay. The module shall provide NexSys-initiated and hard closure initiated
sequential turn-on/off capability for groups of CKS and/or CKV amplifiers. The module
shall provide turn-on to the host CKS and/or CKV amplifier and a sequential turn-on output
to the next amplifier in the chain. Disconnection of AC power to any number of amplifiers
in the chain shall not affect the turn-on sequence capability of all other amplifiers in the
chain.
Audio
Return
Designed & manufactured in the USA by:
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
Out
CKV 2400
Network
+–
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
+–
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Data
2
3
4
5
6
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Address
F
1
1
E
2
D
3
C
4
B
5
A
6
9
7
8
Hi
Lo
N-Coder
Data
Port
Model
NC-NXS
F
E
D
C
B
A
9
7
8
+
NexSys Bus
The module shall contain the power supplies required for powering the NC-NXS NexSys
Network module (if fitted). The module shall include the hardware required for NexSys
Load Monitoring and AC voltage and current monitoring. A 5mm 6-pin Phoenix connector
shall be provided to receive and pass on the turn-on/turn-off initiation signal. A closure
across two of the Phoenix connector terminals on the first amplifier in the chain shall initiate
the turn-on/turn-off sequence. The module shall provide outputs for both amplifier channels
on barrier strip connectors and a signal ground lift jumper. The module shall be designated
the Crest Audio model NC-SLM.
Input A
Input B
–
–
+
NC-SLM Power/Output Module
Load Monitoring, Sequential Turn-On/Off, NexSys power supply,
AC Voltage & Current Monitor, Audio Return
BLOCK DIAGRAMS
CH A OUT
CH B OUT
AUDIO
RETURN
OUT
Load Monitor
ckt
AUDIO
RETURN
OSC
V load
I load
CH SEL/GAIN
FROM
POWER AMP A
NexSys
Module
FROM
POWER AMP B
Audio Return Enable
OSC Out To
Amp Input
NexSys
Module Bus
CONTROL OPTIONS
The following NC-SLM parameters
can be controlled/monitored via
hard closure or NexSys software.
Hard closure:
Sequential Turn On/Off activation
NexSys computer control:
Sequential Turn On/Off initiation &
delay times, load monitor, monitoring of audio return, AC mains voltage, current and wattage.
SPECIFICATIONS
MAINS
TO AMPLIFIER
POWER SUPPLY
Pass-thru sequence time: 200ms
Connectors: 5mm 6-pin
AC Detect
V line
I line
Phoenix connector
5mm 3-pin Phoenix audio return
connector (600Ω source impedance;
ON
COM
OFF
ON
COM
OFF
Opto
OUT
SEQUENTIAL
TURN-ON
IN
NexSys On/Off
NexSys
Digital Supply
I/D
ckt
NexSys Module Bus
40dB of attenuation driven into 600Ω,
referenced from speaker terminals)
Amplifier output barrier strip*
with 0.44" (11mm) center
and 0.32" (8mm) lug space
Controls: Signal chassis
ground lift jumper
*See CKS / CKV power amplifier operator’s manual for power
output specifications.
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification. Crest Audio specification literature is available in electronic form to qualified users.
Contact Crest Audio Inc. for more information. NexSys is a registered trademark of Crest Audio Inc. ©1996 Crest Audio Inc.
(STO)
v. 2.1 4/7/97
*A3300032*
100 Eisenhower Dr., Paramus NJ 07652 USA
Crest Audio Inc.
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Printed in USA
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