Crest audio NC-MCO DATASHEET

Power
Processing

INPUT PROCESSING MODULE

Modules

FOR CKS, CKV & CKX SERIES

POWER PROCESSING AMPLIFIERS

NC-MCO Mono Crossover

Product Information

The NC-MCO Module fits in the Input Processing bay located on the
rear panel of Crest Audio CKS, CKV & CKX Series Power Processing
amplifiers. It is an extremely high quality, fourth-order, two-way elec­tronic mono crossover that feeds the HF output to channel A of the
amplifier and the LF output to channel B. The HF and LF output levels
and crossover frequencies are individually programmable. Unbalanced
loop-thru barrier strip connectors provide convenient outputs to other
amplifiers.

Features:

• NexSys compatible, programmable two-way, 24dB per octave electronic crossover

• Independent two-way, 4th-order, Linkwitz-Riley filters • Loop-thru HF and LF outputs

• Removable gain pot knobs for security • Simple setup, tamper-proof configuration

• All parameters (including precision attenuation settings) programmable via NexSys , hand-held N-Coder or N-Coder/PC software

• Balanced input on barrier strip connector with .325" (8.3mm) screw center, .270" (6.9mm) lug space

Internal Features:

• Jumper-selectable gain of X20 (26 dB), X40 (32 dB, factory setting), or constant sensitivity for full output at 0dBu (.775V) in.

• Jumper-selectable assignment of high-pass or low-pass output for each amplifier channel

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. The NC-MCO is pro­grammable via NexSys

®

, the hand-held N-Coder or N-Coder/PC soft­ware. (NexSys-compatible Power/Output and Network NC modules are
required for NexSys implementation.)

NC-MCO connections

PC Lap-Top running

N-Coder/PC software

ASS 2

ING MAY

USED

tput

ignal
round
ift
umper

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

Data

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

Model

Output Power

Name

@8Ω/Ch.

CKS 100

50W

CKS 200

100W

CKS 400

200W

CKS 800

400W

CKS 800-2

400W

CKS 1200-2

600W

CKS 1600-2

800W

Address

F

F

1

1

E

2

2

D

3

3

C

4

4

B

5

5

A

6

6

9

7

8

7

8

Hi

Lo

Crest Audio
Revision 1.03E

N-Coder

OR

To other amplifiers

Daisy Chain

N-Coder
Data
Port

HP-Out

Model
NC-NXS

E

D

C

B

A

9

LP-Out

Input

–

+

Level

Level

Model
NC-MCO

5

4

6

A

3

7

2

8

1

9

0

10

5

4

6

B

3

7

2

8

1

9

0

10

Input

Signal

Architects and Engineers Specifications - NC-MCO.

The module shall plug into Crest Audio CKS or CKV Power Processing amplifiers in the
Input Processing bay. The module shall be NexSys-compatible. The module shall provide a
two-way, 24 dB per octave electronic crossover with programmable HF and LF output lev­els, HF and LF crossover frequencies, overall output level and HF/LF polarity inversion.
The module shall be controlled/programmed either by NexSys via an NC-NXS module (if
fitted), a hand-held N-Coder or N-Coder/PC software.

All programmed settings shall be stored in non-volatile EEPROM memory. A barrier strip
input connector shall feed one electronically balanced input. Two removable-knob gain pots
shall be provided that control the level of each amplifier channel independent of program­ming. High pass and low pass, loop-thru outputs shall be available on barrier strip connec­tors. An internal input sensitivity/voltage gain jumper shall be provided with selections of
0dBu, X20 and X40. The module shall be designated the Crest Audio model NC-MCO.

NC-MCO Input Processing Module

Mono Crossover

BLOCK
DIAGRAM

HF
Out

LF
Out

N-Coder
Data
Port

HP 1 HP 2

IN

+

-
G

Freq

LP 1 LP 2

Freq Freq

I/F
ckt

ID
ckt

SPECIFICATIONS

Crossover frequencies: 80Hz-8kHz
Input impedance: 50kΩ
Signal-to-noise ratio: 107dB typ.

Vosc

Gain

CH A

CH B

NexSys®
Module Bus

Freq

Trim

Trim

Atten

Gain

Atten

CONTROL OPTIONS

The following NC-MCO parameters can be con­trolled by the hand-held N-Coder, N-Coder/PC
software, or via NexSys software.

Common mode rejection: 90dB typ.
Frequency response: 20Hz-20kHz, ± .25dB
Programmable gain range: 0 to -83dB
Voltage gain/input sensitivity: X20 (26 dB)

X40 (32 dB)

or constant sens. for full output at 0dBu (.775V) in

Connectors: Balanced inputs and

unbalanced HP /LP daisy-chain outputs

on barrier strip connectors

with 0.325" (8.3mm) screw center

and 0.270" (6.9mm) lug space,

RJ-14 (‘RJ-11 6-pin’) N-Coder data port

Controls: 2 gain attenuators (w/removable knobs)

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.

*A3300026*

N-Coder:

Channel attenuation, phase reverse, trim and fre­quency for high & low pass

N-Coder/PC software:

Channel attenuation, phase reverse, muting, trim
and frequency for high & low pass

NexSys computer control:

Channel attenuation, phase reverse, solo, muting,
input and output VU metering, trim and frequency
for high & low pass

Crest Audio Inc.

100 Eisenhower Dr., Paramus NJ 07652 USA

TEL: [phone] FAX: [phone]

http://www.crestaudio.com

Printed in USA