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Com-Tech Power Amplifiers
Reference Manual
1 Welcome
Congratulations on your purchase of a Com-Tech
®
com-
mercial power amplifier. The Com-Tech series is a com-
plete family of amplifiers with a wide range of power
output capabilities. Com-Tech amplifiers can directly
drive “constant voltage” lines, so you can avoid the ex-
pense, distortion and insertion loss associated with
step-up transformers for distributed loudspeaker sys-
tems. Com-Tech amplifiers also utilize Crown’s patented
ODEP
®
protection circuitry which
keeps the amplifier
working under severe conditions that would shut down
a lesser amplifier. All Com-Tech amplifiers feature
Crown’s exclusive PIP™ (Programmable Input Proces-
sor) expansion system. The PIP expansion system
makes it easy to tailor your amplifier to a specific appli-
cation or to add future technology as it develops (see
Section 8 for a list of available PIPs).
This manual will help you successfully install and use
your new Com-Tech amplifier. Please read all instruc-
tions, warnings and cautions. Be sure to read Section
3.3.1 if you plan to use the amplifier in one of its two
mono modes, or if you plan to drive “constant voltage”
lines. Also, for your protection, please send in your war-
ranty registration card today, and save your bill of sale
as it is your
official proof of purchase
.
❏
“Soft-Start”
inrush current limiting protects the house
circuit breaker when several amps are turned on simulta-
neously.
❏
Remote
feature allows CT-10 Series
amplifiers to be
turned on and off from a remote location. Placing the
Enable switch on the amplifier’s front panel to the Remote
position allows the optional
R.S.V.P. (Remote Switching
Voltage Provider) module to control the amplifier.
❏
Energy Saving
circuit allows a CT-10 Series
amplifier to
cut back its energy consumption based on the signal
level offered to the inputs.
❏
Crown’s patented ODEP (Output Device Emulation Pro-
tection) circuitry detects and compensates for overheat-
ing and overload to keep the amplifier working when
others would fail.
❏
Crown’s grounded bridge design delivers incredible volt-
age swings without using stressful output transistor con-
figurations like conventional amplifiers. The results are
lower distortion and superior reliability.
❏
IOC
®
(Input/Output Comparator) circuitry immediately
alerts you if distortion is present. You have real-time
proof
of distortion-free performance.
❏
Enhanced PIP2
(Programmable Input Processor)
connector accepts new accessory modules that further
tailor the amplifier to suit specific applications,
including
wideband load current monitoring.
❏
Drives constant voltage lines without “lossy,” distortion-
producing step-up transformers.
❏
Two mono modes (Bridge-Mono and Parallel-Mono) for
driving a wide range of load impedances.
❏
Very low harmonic and intermodulation distortion give
the best
dynamic transfer function in the industry.
❏
Superior damping factor delivers maximum loudspeaker
motion control for a clean, accurate low end.
❏
Superb crosstalk characteristics and a separate voltage
supply for each channel make it possible to treat each
channel like a separate amplifier.
❏
Full protection from shorted, open and mismatched
loads, general overheating. DC, high-frequency over-
loads, and full internal fault protection are provided by
our latest protection scheme:
“Quad-Mute.”
❏
Efficient heat sinks and a
fully proportial speed fan
dis-
sipate heat quickly and evenly for extra amplifier protec-
tion and extended component life. (The fan is an option
for 120 VAC, 60 Hz
Com-Tech 210s.)
❏
Barrier blocks are provided for both input and output
connections. New input barrier blocks incorporate a
test
point
for a DVM.
❏
Internal three-position input sensitivity switch provides
settings of 0.775 volts for full standard 1-kHz 8/4-ohm
power, 0.775 volts for full standard 1-kHz 70-volt power,
and 26-dB voltage gain.
❏
Mounts in a standard 19-inch (48.3-cm) equipment rack.
❏
Three year “No-Fault” full warranty completely protects
your investment and guarantees its specifications.
1.1 Unpacking
Please unpack and inspect your new amplifier for any
damage that may have occurred during transit. If dam-
age is found, notify the transportation company imme-
diately. Only you, the consignee, may initiate a claim for
shipping damage. Crown will be happy to cooperate
fully, as needed. Save the shipping carton as evidence
of damage for the shipper’s inspection.
Even if the unit arrived in perfect condition, (as most
do), save all packing materials, so you will have them if
you ever need to transport the unit.
NEVER SHIP THE
UNIT WITHOUT THE FACTORY PACK.
1.2 Features
Com-Tech
amplifiers use cutting-edge technology and
miniaturized design to provide the highest power and
value for its size, weight and price. They offer numerous
advantages over conventional designs and provide
benefits you can’t get in amplifiers from any other manu-
facturer. For example, Crown’s patented ODEP protec-
tion circuitry
and grounded bridge
™
output stages
combine to provide performance and reliability that sur-
pass the other, more traditional, designs. Here are some
more of your amplifier’s impressive features:
