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PURPOSE AND FUNCTION
The ST55.2 is a compact, very efficient, two channel power amplifier. It is designed for use in all types of audio or
audio/video systems. The term versatile is almost adequate to describe the variance of operational modes the
ST55.2 is capable of providing. This is all accomplished through the simple placement of internal jumpers and the
paralleling or bridging of its outputs and/or linking multiple ST55.2’s.
Here is a listing for some of the many tasks it can be set up to perform:
• The most obvious function for the ST55.2 is to take 2 separate audio inputs, such as a stereo
pair, and provide 2 separate amplified outputs. Your ST55.2 has arrived set up in this
configuration.
• With the inputs buffered, a line output (OUT BUS) may be taken from the L BUS, R BUS, or L+R
BUS and sent on to another amplifier. This allows for linking of multiple amplifiers.
• Continuing its versatility, the ST55.2 may be used mono to provide one, medium current channel
in order to drive a speaker requiring more power.
•
As a result of the ST55.2’s unique bus system, the input to the left channel may be inverted
thereby allowing the possibility of creating a single high voltage (bridged) channel from one
source, through the left bus.
DESIGN AND CONSTRUCTION
The ST55.2 utilizes high quality electronic circuitry to achieve an environment wherein a detailed, transparent,
and highly musical sound can be realized. The high quality complement of parts, include state-of-the-art solid-
state devices, 1% metal film resistors, computer grade electrolytic power supply capacitors, and a high capacity
toroidal transformer.
FEATURES
Toroidal Transformer - Efficient high current transformer for improved dynamics.
Discrete Circuitry - More accurate and three dimensional reproduction of source material.
Limited Protection - Provides short term protection from accidental shorting of output devices and protection
from thermal overload.
Gold Plated Connectors - Improve connections for better sound and minimized signal loss and degradation.
1% Metal Film Resistors - Low noise resistors for better sound and a greater degree of repeatability.
Medium Current - Ability to reproduce demanding recordings.
Computer Grade Capacitors - Large capacity computer grade electrolytic capacitors for extended low frequency
control and improved dynamics.