Instruction Manual
DC-300A II Power Amplifier
Page 7
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1 Welcome
Congratulations on purchasing a Crown DC-300A II.
Your amplifier is designed to provide reliable operation
with a variety of loads. It is a versatile choice for use in
studios, laboratories, public facilities and on the road.
And the sonic excellence of the DC-300A II makes it a
very good choice for your personal listening pleasure.
Using innovative circuitry, the DC-300A II yields ultra-
low distortion through a wide range of frequencies from
DC (0 Hz) to 20 kHz. The amplifier’s output transistors
are “direct coupled” to the load so there are no output
capacitors or transformers to compromise its superb
sonic integrity. The tremendous output power of the
DC-300A II enables it to deliver balanced 70 volt out-
put in Bridge-Mono mode without using costly “step-
up” transformers. And Crown’s innovative JTS
(Junction Temperature Simulation) circuitry dynami-
cally adjusts the output protection system for unparal-
leled sonic headroom. Crown further protects your
investment with the industry’s only three year “No-Fault”
full warranty. After reading this manual and learning
about the features, facilities and capabilities of your
amplifier, you will understand why Crown amplifiers are
recognized as the worldwide standard for audio excel-
lence.
For your protection, please send in your warranty reg-
istration card and save your bill of sale, as it is your
official proof of purchase.
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 may initiate a claim with the carrier for
damage resulting during shipment. Even if the unit ar-
rived 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
Your dual channel (stereo) amplifier can be configured
for higher-powered single channel operation. It also
provides the following features:
❏ AB+B class circuitry for maximum efficiency with mini-
mum crossover “notch” distortion.
❏
IOC
®
(Input/Output Comparator) alerts of distortion ex-
ceeding 0.05% to provide
proof of performance
.
❏ Ultra-low harmonic and intermodulation distortion result
in the best dynamic transfer function in industry.
❏ Very low noise level and wide dynamic range exceed
digital audio standards.
❏ Exclusive JTS (Junction Temperature Simulation) cir-
cuitry protects the output devices and provides excep-
tional dynamic headroom.
❏ High damping factor gives you greater loudspeaker mo-
tion control.
❏ Bridge-Mono output can drive 70 volt “constant voltage”
lines without expensive, distortion-producing “step-up”
transformers.
❏ Convection cooling with integrated heat sink/chassis de-
sign for maintenance-free operation.
❏ Mounts in a standard 19 inch (48.3 cm) rack.
❏ Three year “No-Fault” full warranty protects your invest-
ment and guarantees the specifications of units in North
America and other select countries.
Fig. 1.1 DC-300A II