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LIST OF ILLUSTRATIONS
Micro-Tech 1000 Front Panel 1 - 1
Typical Frequency Response 2 - 3
Typical Phase Response 2 - 3
Typical Power Output, Stereo Mode; 8, 4 and 2 Ohms 2-4
Typical Power Output, Bridged Mono Mode; 16, 8, and 4 Ohms 2-4
Typical I.M. Distortion, Parallel Mono Mode; 8, 4 and 2 Ohms 2 - 5
Typical I.M. Distortion; Stereo Mode; 8, 4 and 2 Ohms 2 - 5
Typical Damping Factor 2-6
Typical Crosstalk 2-6
Typical Output Impedance 2-7
Typical Phase Angle 2-7
Micro-Tech 1000 Mounting Dimensions 3 - 1
Micro-Tech 1000 Rear Panel 3-2
Banana (MDP) Plug 3 - 2
Typical System Hookup 3-2
Wire-Size Nomograph 3 - 3
Jumper-Wire Location for Bridge-Mono Operation 3 - 4
Parallel Mono Hookup 3-4
Effect of Input-Capacitor Value on Frequency Response 3 - 5
RFI Filters 3 - 5
Fuse Selector Nomograph for Loudspeaker Protection 3-6
Relay-ControlledProtector with Overload Indicator 3-6
Dust Filter 3 - 7
Block Diagram 4 - 2
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SECTION 1
GENERAL INFORMATION
1.1 Introduction
The Crown Micro-Tech™ 1000 is a miniaturized yet
h i g h - t e c h n o l o g y s t e r e o p o w e r a m p l i f i e r f o r
professional sound reinforcement and recording. This
amplifier provides enormous power within a low-
profile package. It took Crown technology to improve
performance while reducing size and cost.
The Micro-Tech can deliver 1000 watts RMS in mono
mode at less than 1 percent THD, into 1 or 4 ohms. A
"parallel mono" switch combines the outputs of both
channels to make a monophonic amplifier capable of
1000 watts into 1 ohm. By adding an internal jumper
for the "bridge mono" configuration, the user can
obtain 1000 watts into 4 ohms.
In stereo mode, at 1 kHz, the Micro-Tech provides 500
watts continuous average power per channel into 2
ohms, 400 watts into 4 ohms, and 280 watts into 8
ohms with no more than 0 . 2 5 % THD. From 20 Hz to 20
kHz, the unit delivers 250 watts per channel into 8
ohms at 0 . 1 % THD.
The grounded-bridge circuitry has many advantages
over conventional designs to offer a high value to our
customers.
Patented Crown circuitry allows e x t r e m e voltage
swings without putting output transistors in series; this
provides lower distortion and greater reliability.
Reliability is further enhanced by a redundant power
supply. T h e M i c r o - T e c h u s e s an "Output Device
Emulator Protection" (ODEP) circuit which simulates
the output transistors. With this circuit, the amplifier
c a n detect and c o m p e n s a t e for overheating and
overload. The unit is also protected against output
shorts, open c i r c u i t s , m i s m a t c h e d loads, overall
overheating, and high-frequency overloads.
Efficient heat sinking and a self-contained forced-air
cooling s y s t e m prevent overheating and prolong
component life. T h e direction of airflow may be
reversed, if necessary, to work with the rack cooling
system - a feature unique to Crown. The dust filter
located on the front of the unit is easily removed for
cleaning or replacement.
Inputs are balanced 1/4" phone jacks with adjustable
gain. Outputs are 5-way banana jacks for minimum
power loss.
Chassis ground and signal ground are isolated to
reduce hum from ground loops.
The design of the package permits stacking of several
amplifiers atop each other. The Micro-Tech also is
rack-mountable in a standard 19" rack, using the four
mounting screws and four nylon washers included.
Fig. 1.1 Micro-Tech 1000 Front Panel
1-1
