Crest Audio NC-DSP-D - TECHNICAL Instruction manual

Features:
• Digital signal processing and attenuation programmed by NexSys or N-Coder/PC software.
• Can be used stand-alone after being programmed • AES/EBU digital input
• Balanced input barrier strip connectors • Two delays are equivalent to 600 feet (183 meters) each
• Analog loop-thru post-processing outputs on barrier strip connectors • Amp channel gain pot knobs removable for security
• Crossover, EQ, delay, and dynamics functions • Simple setup, tamper-proof configuration
• Data error LED indicator
Internal Features
• Jumper-selectable gain of X20 (26 dB), X40 (32 dB, factory setting), or constant sensitivity for full output at 0dBu (.775V) in.
NC-DSP-D Digital Signal Processor (DSP)
Product Information
The NC-DSP-D Module fits in the Input Processing bay located on the
rear panel of Crest Audio CKS, CKV & CKX Series Power Processing
amplifiers. It provides state-of-the-art digital signal processing integrat-
ed with the amplifier channel. Input to the NC-DSP-D is via an
AES/EBU digital port, removing the need for an extra D/A A/D conver-
sion. This reduces cost and noise, and improves system performance.
Two post-processing analog outputs are provided to daisy chain to addi-
tional amp channels requiring the same processing.
An internal jumper selects between gains of X20 (26 dB), X40 (32 dB),
or constant sensitivity for full output at 0dBu (.775V) in. The standard
factory setting is for X40 (32dB). Individual channel attenuators are pro-
vided with removable knobs for extra security.
Via NexSys®or N-Coder/PC software, algorithms are down-loaded to
the NC-DSP-D to perform crossover, equalizing, driver alignment, sys-
tem delay, limiting, compression, gating functions, etc. All the require-
ments for loudspeaker processing can be performed by the NC-DSP-D.
Architects and Engineers Specifications - NC-DSP-D.
The module shall plug into Crest Audio CKS or CKV Power Processing amplifiers in the
Input Processing bay. The module shall provide full DSP (digital signal processing) func-
tions. Capabilities for EQ, cross-over filters, delay, dynamics control, etc. shall be achiev-
able. The module shall be capable of being programmed and updated over the NexSys net-
work (if fitted in a CKS or CKV amplifier loaded with an NC-NXS module and NexSys-
compatible Power/Output module). The module shall operate as a stand-alone unit after
being programmed with the N-Coder/PC software. The audio input shall be of AES/EBU
type on a three pin XLR. Two, post-processing, analog outputs on barrier strip connectors
shall be provided to loop-thru out to additional amp channels requiring the same processing.
Two removable-knob gain pots shall be provided that control the level of each amplifier
channel independent of programming. The module shall be designated the Crest Audio
model NC-DSP-D.
INPUT PROCESSING MODULE
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
PUSH
Model NC-DSP-D
Error
AES/EBU
In
N-Coder
Data
Port
78
9
5
2
0
1
346
10
78
9
5
2
0
1
346
10
Output A Output B
++–
–
Daisy Chain Level
B
Level
A
Output
A
B
+
+
–
–Signal
Ground
Lift
Jumper
CLASS 2
WIRING MAY
BE USED
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Model
NC-NXS
Hi
Data
Lo
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Designed & manufactured in the USA by:
Network
+– +–
Address
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
To other
amplifiers
OR
PC Lap-Top running
N-Coder/PC software
N-Coder
Crest Audio
Revision 1.03E
NexSys Bus
AES/EBU
In
Digital
Signal
Source
NC-DSP-D connections
Power
Processing
Modules

Digital Signal Processor (DSP)
CH A
Power
Amp
CH B
Power
Amp
I/F
ckt
NexSys
Module Bus
DAC
DSP
Delay
MEM
AES
RCVR
AES/EBU
In
Vosc
For LM
CH A
OUT
CH B
OUT
N-Coder
Data Port
Atten
Atten
ID
Daisy
Chain
BLOCK
DIAGRAM
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
NC-DSP-D Input Processing Module
SPECIFICATIONS
Internal digital signal processing: 24-bit
Digital-to-analog converters: 18-bit
Dynamic range: 100dB
Max input level: +22dBu
THD: 0.005%
Signal-to-noise ratio: 100dB
Common mode rejection: 100dB
Frequency response: 20Hz-20kHz
Voltage gain/input sensitivity: 0dBFS
Connectors: AES/EBU digital input (XLR),
Balanced loop-thru daisy-chain outputs
on barrier strips with 0.325" (8mm) center
and 0.27" (7mm) lug space,
RJ-14 (‘RJ-11 6-pin’) N-Coder data port
Controls: 2 gain attenuators (w/ removable knobs )
Indicators: Data error LED
v. 2.1 4/7/97
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.
*A3300022*
CONTROL OPTIONS
The following NC-DSP-D parameters can be con-
trolled by N-Coder/PC software or via NexSys
software.
N-Coder/PC software:
Channel A & B attenuation, phase reverse, muting,
all DSP functions*.
NexSys computer control:
Channel A & B attenuation, phase reverse, solo,
muting, input and output VU metering; all DSP
functions*.
*DSP Programs: Stereo BP, HP and LP
crossovers, mono BP/BP, BP/HP, LP/BP, and
LP/HP crossovers, dual mono 5-band EQ
*DSPAlgorithms: Mixer, shelf, 4 and 5-band
parametric EQ, long delay, bandpass crossover, 4-
band parametric post EQ, short delay, limiter, gain