Crest Audio CKi User Manual

CKi

SERIES

CKi Series

Power Amplifiers

Crest Audio, the first company to offer com­puter controlled amplification now raises the bar.
With the introduction of the CKi series of amplifiers,
Crest Audio has added many standard features that
other manufactures either charge additional for or
don’t offer at all.Whether your requirements are sim­ple or extremely complex,CKi series amplification sys­tems are perfect for permanent installations of any
size. As with all Crest Audio amplifiers, reliability and
sonic performance are the most important factors in
the amplifiers design.

With three different types of amplifiers, two
add-on modules, and plug in options, the CKi series of
amplifiers allows you the flexibility to install exactly
what you need to do the job. CKiS amplifiers are the
low impedance series, CKiV units are specially
designed for distributed systems, and CKiX is the 100
Volt, transformer isolated version of the amplifier.
Module options include NxEtherNet and
NxCobraNet cards which can be ordered installed in
the amplifiers or easily added later. The NxEtherNet
card is an ethernet based network module that enables
the amplifier to communicate with NexSys and
MediaMatrix software for control and reporting of
amplifier functions by remote computer control.The
NxCobraNet card incorporates all of the functionality
of the NxEtherNet module plus the ability to decode
2 channels of CobraNet digital audio.

CKi amplifiers standard features include
sequential turn-on / turn-off (STO), input gain switch

(x20, 0dB / .775V, and x40), mode switch (stereo, par­allel, bridged), ground lift switch, and removable detent­ed potentiometers. In addition, status LEDs are provid­ed on the front and rear of the unit for signal, ACL,
IGM, and protect conditions. Power monitoring is by
two LEDs, one which displays that power is present to
the amplifier and one that signifies that the amplifier is
operating (Active LED). Input is through 3-pin euro
style connectors and output is provided on 4 position
barrier strips. Fault I/O closure outputs are provided
on a three pin euro-style connector to alert external
supervisory systems, such as a control room display, if
an amp problem exists.

Amplifier options available include NxDSP
processor plug-in board and the transformer input iso­lation board. The NxDSP option allows control of
speaker related functions such as delay, EQ, and limit­ing.The transformer isolation board helps to eliminate
problems with improper audio grounding and imped­ance mis-matches between equipment.

Crest TourClass protection includes active clip
limiting (ACL) which prevents speaker damage by pro­viding gentle gain reduction at the onset of clipping.
Instantaneous gain modulation (IGM) monitors speak­er loads to detect conditions that overstress ampli­fiers. Autoramp gradually increases gain to the preset
amplifier setting when the amplifier is turned on.

Backed by Crest Audio’s 5 year warranty* and
exceptional service departments, CKi amplifiers are a per­fect choice for all of your fixed installation requirements.

Sequential Turn-on

connections

Module bay for NxCobraNet or

NxEthernet modules

User resettable AC

mains breaker

Fault I/O for con-

nection to moni-

toring systems

Barrier strip output

connectors

Signal ground

switch

Mode switch for

stereo, parallel, and

bridged mode

operation

Detented rear panel

attenuators with

removable knobs

Status LEDs make

in-rack trou-

bleshooting a

breeze

3 pin euro
style input

connectors

Selectable input

sensitivity

Introduction

2

*USA, Canada, and many other countries.

CKiS Series

Designed to drive low impedance loads

power ratings are Watts per channel, both channels driven, 1kHz,0.02% THD+N

lbs / kg

* circuit breaker rating, 120 V / 4 Ω

Model

CKi100s

CKi200s

CKi400s

CKi800s

CKi800-2s

CKi1200s

CKi1600s

Stereo

8 Ω

60W

120W

255W

440W

420W

630W

815W

4 Ω

90W

175W

320W

670W

670W

940W

1130W

2 Ω

N/A

N/A

N/A

N/A

870W

1130W

1440W

Bridged

8 Ω

180W

350W

510W

880W

880W

1880W

2260W

4 Ω

N/A

N/A

N/A

N/A

1740W

2260W

2880W

Class

AB

AB

AB

AB

H

H

H

RMS

22V

32V

56V

64V

64V

78V

90V

Maximum

31V

45V

64V

90V

90V

110V

127V

Model

CKi100s

CKi200s

CKi400s

CKi800s

CKi800-2s

CKi1200s

CKi1600s

1/8 power

612

1100

2120

3584

1210

3164

3154

1/3 power

780

1380

2820

4700

3600

5040

6525

Rack U

2

2

2

3

3

4

4

Weight

26.63 / 12.09

29.44 / 13.37

30.44 / 13.82

50.20 / 22.80

70.65 / 32.08

70.65 / 32.08

70.65 / 32.08

Idle (120V)

.5A

.6A

.7A

.7A

.7A

1.3A

1.3A

1/8 Power

1.65A

3.0A

5.8A

10.0A

4.2A

9.6A

10.0A

1/3 Power

2.3A

4.2A

8.6A

14.8A

12.1A

17.3A

22.6A

Maximum*

3.5A

6.5A

12A

15A

20A

26A

30A