NC-DSP-D - Crest Audio

INPUT PROCESSING MODULE
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
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 integrated
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 conversion.
This reduces cost and noise, and improves system performance.
Two post-processing analog outputs are provided to daisy chain to additional
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 provided
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, system
delay, limiting, compression, gating functions, etc. All the requirements
for loudspeaker processing can be performed by the NC-DSP-D.
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.
Output
–
A
+
+
B
NC-DSP-D connections
CLASS 2
WIRING MAY
BE USED
– Signal
Ground
Lift
Jumper
Designed & manufactured in the USA by:
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
Network
+ – + –
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
NexSys Bus
PC Lap-Top running
N-Coder/PC software
Data
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
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) functions.
Capabilities for EQ, cross-over filters, delay, dynamics control, etc. shall be achievable.
The module shall be capable of being programmed and updated over the NexSys network
(if fitted in a CKS or CKV amplifier loaded with an NC-NXS module and NexSyscompatible
Power/Output module). The module shall operate as a stand-alone unit after
2
3
4
5
6
1
7
Output Power
@8Ω/Ch.
8
F
9
Hi
50W
100W
200W
400W
400W
600W
800W
Address
E
D
A
C
B
2
3
4
5
6
1
7
8
F
9
Lo
E
D
A
C
B
Model
NC-NXS
PUSH
OR
N-Coder
Data
Port
Error
AES/EBU
In
Crest Audio
Revision 1.03E
N-Coder
Level 4 5
6
A 3 7
2
8
1
9
0 10
Daisy Chain Level 4 5
6
B 3 7
Output A Output B
2
8
+ – + –
1
9
0 10
To other
amplifiers
Model NC-DSP-D
Power
Processing
Modules
Digital
Signal
Source
AES/EBU
In
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.

BLOCK
DIAGRAM
SPECIFICATIONS
Digital Signal Processor (DSP)
CH A
OUT
Daisy
Chain
CH B
OUT
AES/EBU
In
N-Coder
Data Port
AES
RCVR
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
NC-DSP-D Input Processing Module
Delay
MEM
DSP
I/F
ckt
DAC
ID
NexSys
Module Bus
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
Atten
Atten
Vosc
For LM
CH A
Power
Amp
CH B
Power
Amp
The following NC-DSP-D parameters can be controlled
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
*DSP Algorithms: Mixer, shelf, 4 and 5-band
parametric EQ, long delay, bandpass crossover, 4band
parametric post EQ, short delay, limiter, gain
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: 201.909.8700 FAX: 201.909.8744
http://www.crestaudio.com
Printed in USA