Crest audio NC-DSP-D DATASHEET

Power
Processing

INPUT PROCESSING MODULE

Modules

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.

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.

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.

NC-DSP-D connections

OR

PC Lap-Top running

N-Coder/PC software

CLASS 2

WIRING MAY

BE USED

Output

–

A

+

+

B

–

Signal
Ground
Lift
Jumper

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

Designed & manufactured in the USA by:

Model

Output Power

Name

@70.7V

CKV 100

50W

CKV 200

100W

CKV 400

200W

CKV 800

400W

CKV 1600

800W

CKV 2400

1200W

Network

+–

+–

NexSys Bus

Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA

Model

Output Power

Name

CKS 100
CKS 200
CKS 400
CKS 800

CKS 800-2
CKS 1200-2
CKS 1600-2

Data

1

2

3

4

5

6

7

Hi

@8Ω/Ch.

50W
100W
200W
400W
400W
600W
800W

Address

F

E

D

C

B

A

9

8

N-Coder
Data
Port

Error

AES/EBU

Model
NC-NXS

F

1

E

2

D

3

C

4

B

5

A

6

9

7

8

Lo

PUSH

In

–

Digital
Signal

Source

Level

4

A

3
2
1

0

Level

4

B

3
2
1

0

Model NC-DSP-D

AES/EBU
In

5

6

7

8
9

10

5

6

7

8
9

10

Crest Audio
Revision 1.03E

+

N-Coder

Daisy Chain

Output A

–

+

To other

amplifiers

Output B

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.

NC-DSP-D Input Processing Module

Digital Signal Processor (DSP)

BLOCK
DIAGRAM

Daisy
Chain

AES/EBU

CH A
OUT

CH B
OUT

In

N-Coder
Data Port

AES
RCVR

SPECIFICATIONS

Internal digital signal processing: 24-bit
Digital-to-analog converters: 18-bit

Vosc
For LM

Delay
MEM

CH A
Power
Amp

CH B
Power
Amp

DSP

I/F
ckt

DAC

ID

NexSys
Module Bus

Atten

Atten

CONTROL OPTIONS

The following NC-DSP-D parameters can be con­trolled by N-Coder/PC software or via NexSys
software.

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

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, HPand 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, 4­band parametric post EQ, short delay, limiter, gain

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.

v. 2.1 4/7/97

Contact Crest Audio Inc. for more information. NexSys is a registered trademark of Crest Audio Inc. ©1996 Crest Audio Inc.

100 Eisenhower Dr., Paramus NJ 07652 USA

*A3300022*

Crest Audio Inc.

TEL: [phone] FAX: [phone]

http://www.crestaudio.com

Printed in USA