Page 7
Com-Tech 200/400/800/1600 Power Amplifiers
1 Welcome
Congratulations on your purchase of a
Com-Tech
®
commercial power amplifier. The
Com-Tech series is a
complete 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 expense, distortion and insertion loss associ-
ated with step-up transformers for distributed
loudspeaker systems.
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
P.I.P.
®
(Program-
mable Input Processor) expansion system. The
P.I.P.
expansion system makes it easy to tailor your amplifier
to a specific application or to add future technology as
it develops (see Section 8 for a list of available
P.I.P.s ).
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
.
protection circuitry
and grounded bridge
™
output
stages combine to provide performance and reliability
that surpass the other more traditional designs. Here
are some more of your amplifier’s impressive features:
❏
Crown’s patented
ODEP
®
(Output Device Emulation
Protection) circuitry detects and compensates for
overheating and overload to keep the amplifier working
when others would fail.
❏
Crown’s
grounded bridge
™
design delivers incredible
voltage swings without using stressful output transistor
configurations like conventional amplifiers. The results
are lower distortion and superior reliability.
❏
IOC
®
(Input/Output Comparator) circuitry immediately
alerts you if any type of distortion exceeds 0.05%. We
provide this feature so you will have real-time
proof of
distortion-free performance.
❏
P.I.P. (Programmable Input Processor) connector
accepts accessories that tailor the amplifier to suit
specific applications.
❏
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 loud-
speaker 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 and high-frequency
overloads. Full internal fault protection.
❏
Efficient heat sinks and three-speed fan dissipate heat
quickly and evenly for extra amplifier protection and
extended component life. (The fan is an option for
120 VAC, 60 Hz
Com-Tech 200s.)
❏
Barrier blocks are provided for input and output
connections.
❏
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
(units can also be stacked).
❏
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 cooper-
ate fully as needed. Save the shipping carton as evi-
dence 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 numer-
ous advantages over conventional designs and pro-
vide benefits you can’t get in amplifiers from any other
manufacturer. For example, Crown’s patented
ODEP
