Peavey LT Series - Manual (Page 5)

p. 3
introduction 1
welcome
Congratulations on your purchase of a new LT / ST Series professional power amplifier and thank you for your con-
fidence in Crest Audio products. 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 LT and ST Series amplifiers are designed for high operating efficiency and accurate sonic performance across
the full audio bandwidth, even under stressful conditions.
The Crest Audio LT and ST series both utilize Class D amplifier technology which greatly improves the efficiency of
the amplifier and reduces the power demand from the mains supply.The LT amplifier incorporates a linear power
supply whereas the ST uses a resonant switching supply with power delivery characteristics similar to a linear sup-
ply but with greatly reduced weight. Both power supply designs are built to the same uncompromising standards.
This, combined with major advances in amplifier technology provides for extreme reliability and sonic accuracy for
which Crest products are renown.
The Crest audio LT series and ST series amplifiers differ in power supply design, electrical efficiency and weight how-
ever, their feature sets are identical. For this reason, the majority of this users manual applies to both models.
LT linear-toroid power supply
A traditional linear power supply is used in the LT Series. Because of the amplifier sections efficiency, (approx
93%) the transformer does not need to be as big or as heavy.This gives the LT Series an advantage in deliver-
ing more power in a more compact package.
The efficiency of the output stage also gives the power supply the ability to handle heavy-duty cycles without
compromising sonic integrity.
ST resonant-switching power supply
The ST amplifier switching power supply employs a resonant design which utilizes zero-power switching
technology.
Benefits of resonant-switching include:
• reduced power component stress for
better reliability and efficiency
• 20dB lower noise than conventional switching supplies
(and therefore more EMC friendly)
• behaves like a classic linear supply, but with the added
advantages of size and weight reduction
In order to maintain strict quality assurance standards, all Crest Audio power amplifiers are built in our state-of-the-
art USA manufacturing facility. Internal components are the finest available and key sub-assemblies are pre-tested
before final assembly. Each amplifier is “burned in” and thoroughly tested (using precision audio test equipment)
before shipping. In addition, all LT / ST 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 guar-
antee of fail-safe reliability. You can depend on consistent, stable performance even when your LT / ST Series ampli-
fier is subjected to punishing extremes in the most demanding fixed or mobile sound reinforcement applications.