The Crest Audio CKX150 Power Processing amplifier is designed
specifically for the unique requirements of high quality, transformer-iso-
lated 100V, 70.7V, or 50V operation (factory configured) distributed
sound systems in commercial, industrial and institutional installations.
Design goals met by the CKX150 include exceptional sonic accuracy,
high efficiency, minimum power consumption, comprehensive loud-
speaker protection, and the ability to handle extended duty cycles.
In addition, the CKX150 incorporates Crest Audio’s proprietary modu-
lar approach to input/output and external control configuration. We call
this concept Power Processing. Through the provision of three plug-in
module bays, these amplifiers offer exceptional flexibility with integral
signal processing, load monitoring, and either local or system-wide com-
puter control via Crest Audio’s NexSys
®
network.
The CKX150 amplifier is manufactured exclusively in Crest Audio’s
own USA plant, using only the highest quality components. Key sub-
assemblies are individually pre-tested, and all units are rigorously
“burned-in” before final checkout on precision test equipment.
CKX150 POWER
PROCESSING AMPLIFIER
Power Specification
4 0 H z – 2 0 k H z , 0 . 1 % T H D + N
7 5 W
• Transformer-isolated outputs.
100V, 70.7V, or 50V operation (factory configured)
• Sequential Turn-On/Off (STO). Standard system uses any +8 to
+18VDC source and contact closure.
• PowerSave. Reduces power consumption at idle by turning off the
bias circuit (and fan if heat sink temperature is below allowed thresh-
old) when no signal present at input.
• 3 Module Bays. Unique chassis construction provides three separate
bays into which a diverse range of space-saving and cost effective
Input Processing, Network and Power/Output modules can be fitted.
By combining multiple processing and control functions in the ampli-
fier, CKX Series Power Processing amplifiers significantly save on
installation costs versus conventional outboard processing.
• Cool Operation. High thermal mass heat sinks, with high-efficiency
variable speed fan. Front panel mounted filter for easy maintenance.
• “Overbuilt” Power Supply. In the Crest tradition, the power supply
is “over-engineered” for ample current reserves to meet demanding
load conditions.
• More Transistors. More output devices than comparably-powered
competitive models to provide wider safe operating area and lower
heat generation.
• TourClass
®
Protection Circuits:
ACL (Active Clip Limiting) prevents speaker damage with gentle
gain reduction at clip threshold.
IGM (Instantaneous Gain Modulation) monitors connected loads to
detect conditions that may overstress output devices, allowing safe
operation into difficult loads.
AutoRamp gradually increases gain to attenuator setting level when
amplifier is turned on.
TourClass also includes comprehensive thermal management, and
short circuit, DC voltage, turn-on/off transient, current inrush and
sub/ultrasonic input protection.
• Selectable input sensitivity/voltage gain (internal jumpers)
• Front panel status indication
• Rear panel attenuators with removable knobs
• Barrier strip input and output connectors
• Optional input isolation transformers
• Front panel label area
CKX150 Features
Figures are watts per channel, both channels driven.
NexSys is a registered trademark of Crest Audio Inc.
Preliminary Product Description
