Crest Audio NC-MCO - TECHNICAL Instruction manual

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
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 elec-
tronic 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.
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. The NC-MCO is pro-
grammable via NexSys®, the hand-held N-Coder or N-Coder/PC soft-
ware. (NexSys-compatible Power/Output and Network NC modules are
required for NexSys implementation.)
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 lev-
els, 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 program-
ming. High pass and low pass, loop-thru outputs shall be available on barrier strip connec-
tors. 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.
INPUT PROCESSING MODULE
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
Model
NC-MCO
Daisy Chain
+
Input
–
Level
B
Level
A
78
9
5
2
0
1
346
10
78
9
5
2
0
1
346
10
HP-Out LP-Out
N-Coder
Data
Port
u
tput
A
B
S
ignal
G
round
L
ift
J
umper
L
ASS 2
R
ING MAY
E
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
Input
Signal
To other amplifiers
NexSys Bus
N-Coder
Crest Audio
Revision 1.03E
OR
PC Lap-Top running
N-Coder/PC software
NC-MCO connections
Power
Processing
Modules

Mono Crossover
HF
Out
LF
Out
HP 1 HP 2
LP 1 LP 2
IN
+
-
G
Vosc
CH A
CH B
I/F
ckt
ID
ckt
NexSys®
Module Bus
N-Coder
Data
Port
Gain
Gain
Freq
Freq Freq
Freq
Trim
Trim
Atten
Atten
BLOCK
DIAGRAM
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
NC-MCO Input Processing Module
SPECIFICATIONS
Crossover frequencies: 80Hz-8kHz
Input impedance: 50kΩ
Signal-to-noise ratio: 107dB typ.
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)
v. 2.1 4/7/97 *A3300026*
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.
CONTROL OPTIONS
The following NC-MCO parameters can be con-
trolled by the hand-held N-Coder, N-Coder/PC
software, or via NexSys software.
N-Coder:
Channel attenuation, phase reverse, trim and fre-
quency 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