Crown CE 2000, Reference Manual

Page: 40 / 52

Page 40
CE-Series Amps with an Attitude!
TRANSLATOR
BALANCE
INPUT STAGE
VARIABLE
GAIN STAGE
ERROR
AMP
BALANCED
INPUTS
TO SIGNAL
PRESENCE
INDICATOR
COMPRESSOR
CONTROL
TO CLIP
INDICATOR
BUFFER
MUTE
DC PROTECT
LOGIC
TO
FAULT
CONNECTOR
–VCC
6 Principles of Operation
For the sake of simplicity, only channel one of the amplifier is
described.
Signal is presented to the CE 1000 and CE 2000 through one
of three connectors when using the standard input module.
Each channel is outfitted with a balanced XLR / phone jack,
and a barrier strip. These connectors are wired in parallel,
which allows daisy chaining when needed. The signal is then
converted from balanced to unbalanced in the Balanced In-
put Stage where it also receives RFI protection. Signal then
flows into the Variable Gain Stage where the front panel level
controls are allowed to affect the gain. This stage also pro-
vides the necessary scaling to change the amplifier’s overall
input sensitivity when the rear mounted input sensitivity switch
is moved.
Following this stage, the signal is put under the control of a full-
time compressor circuit comprised of a symmetrical window
detector, a buffer amplifier, and the gating op amp which uses
several small components to set the compressor’s attack and
decay characteristics. The actual compressing is accom-
plished by an opto-isolator which affects the gain in the signal
path.
Fig. 6.1
CE Series
Amplifier Block
Diagram