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introduction
1
welcome
Congratulations on your purchase of a new Pro II Series professional
power amplifier, and thank you for your confidence in Crest Audio prod-
ucts.You are among the growing number of audio professionals who have
made Crest Audio one of the world’s leading suppliers of professional and
commercial/industrial audio systems.
For your safety, please read the Important Precautions section before
installing and operating the amplifier.The Crest Audio Pro II Series is based
on the same advanced circuit topologies that have made Crest’s original
Professional Series amplifiers the choice of touring professionals world-
wide. Pro II Series amplifiers are designed for high operating efficiency and
accurate sonic performance across the full audio bandwidth, even under
stressful conditions.
The Pro II Series heralds a major advance in amplifier design from Crest
Audio, providing the extreme reliability and hallmark sonic accuracy for
which Crest products are famous, in a rugged package but at only half the
weight of previous models of similar power.These dramatic weight savings
are made possible by PowerLok, a radical new power-supply technology
that provides significant performance and flexibility advances over conven-
tional designs.PowerLok is Crest Audio's unique implementation of Power
Factor Correction, which allows current to be drawn throughout the
entire cycle of the
AC line-frequency, providing maximum output power,
while drawing significantly smaller peak currents from the
AC line.
Compared with an amplifier using a conventional power-supply,PowerLok
requires less peak power to produce identical output power, and because
PowerLok's current peaks are smaller,a Pro II amplifier can be serviced by
a lower-rated breaker than a conventional amplifier of similar wattage. See
separate literature for full details on the benefits of PowerLok technology.
In order to maintain strict quality assurance standards, all Crest Audio
power amplifiers are built in our state-of-the-art
USA manufacturing facili-
ty.Internal components are the finest available and key sub-assemblies are
pre-tested before final assembly. Each amplifier is “burned in” and thor-
oughly tested
(using precision audio test equipment) before shipping. In
addition,all Pro II Series amplifiers incorporate Crest’s exclusive TourClass
protection features to safeguard both internal circuitry and connected
loudspeakers.
This proven combination of advanced design, quality construction, and
comprehensive circuit protection is your guarantee of fail-safe reliability.
You can depend on consistent,stable performance even when your Pro II
Series amplifier is subjected to punishing extremes in the most demanding
fixed or mobile sound reinforcement applications.