Controls and Connectors
Level: A back panel rotary potentiometer for each channel used to control the output level.
Power: A front panel rocker switch used to turn the amplifier on and off.
Stereo/Mono: A three-position back panel switch used to select Stereo, Bridge-Mono or Parallel-Mono mode.
Sensitivity: A three-position switch inside the back cover plate used to select the input sensi- tivity for both channels: 0.775 volt or 1.4 volts for standard 1 kHz power into 8 ohms, or 26 dB gain.
Ground Lift: A two-position back-panel switch used to isolate the phone jack input grounds from the AC ground.
Reset: A back-panel pushbutton switch (one per channel) that resets the circuit breaker.
Indicators
(all located on front panel)
Enable: This amber indicator shows the on/off status of the low-voltage power supply and cooling fan.
ODEP: Each channel has an amber front panel indicator that shows thermal-dynamic energy reserve. Normally, each ODEP indicator is lit to show available reserve energy. The indicator will dim proportionally as the energy reserve for its channel decreases. In the rare event that a channel has no reserve, its indicator will turn off and the ODEP circuitry will limit the channel’s output drive. They remain off
if the power is turned off, disconnected, or if the low-voltage power supply fuse blows. A channel’s ODEP indicator will also remain off if its high-voltage supply fuse blows (or breaker opens) or if transformer thermal protection is activated.
Input/Output
Input Connector: Two balanced 1/4-inch (6.35-
mm)phone jacks in parallel with two XLR connectors.
Input Impedance: Nominally 20 k ohms, bal- anced. Nominally 10 k ohms, unbalanced.
Input Sensitivity: Settings include 0.775 volt and 1.4 volts for standard 1 kHz power, or 26 dB gain.
Output Connectors: Two sets of color-coded binding posts for banana plugs, spade lugs or bare wire (European models do not accept banana plugs).
Output Impedance: Less than 10 milliohms in series with less than 2 microhenries.
DC Output Offset: (Shorted input) ±10 mil- livolts.
Output Signal:
Stereo: Unbalanced, two-channel.
Bridge-Mono:Balanced, single-channel. Channel 1 controls are active; Channel 2 should be turned down.
Parallel-Mono: Unbalanced, single-channel. Channel 1 controls are active; Channel 2 is bypassed.
Protection
The Micro-Tech Series amplifier is protected against shorted, open or mismatched loads; overloaded power supplies; excessive tem- perature, chain destruction phenomena, input overload damage and high-frequency blowups. It also protects loudspeakers from input/output DC and turn-on/turn-off transients.
If unreasonable operating conditions occur, the patented ODEP circuitry will proportionally limit the drive level to protect the output stages, particularly in the case of elevated temperature.
Transformer overheating will result in a tempo- rary shutdown of the affected channel; when it has cooled to a safe temperature, the trans- former will automatically reset itself. Controlled slew rate voltage amplifiers prevent RF burn- outs, and input overload protection is provided by the input current limit.
Turn On: The four-second turn-on delay pre- vents dangerous turn-on transients. Turn-on occurs at zero crossing of the AC waveform, so power sequencers are rarely needed with mul- tiple units. Note: To change the turn-on delay time, contact Crown’s Technical Support Group.
Construction
Steel chassis with durable black finish, front panel Lexan overlay and specially designed “flow-through” ventilation from front to side panels.
Cooling: Internal heat sinks with forced-air cooling for rapid, uniform heat dissipation.
Dimensions: EIA Standard 19-inch
(48.3-cm) rack mount width (EIA RS-310-B),
3.5inches (8.9-cm) high and 16 inches (40.6- cm) deep behind front mounting surface.
Weight:
Micro-Tech 600: 36 lb, 4 oz (16.5 kg) net. 41, lb 2 oz (18.7 kg) shipping.
Micro-Tech 1200: 41 lb, 1 oz (18.6 kg) net. 45, lb 3 oz (20.5 kg) shipping.
Micro-Tech 2400: 46 lb, 14 oz (21.3 kg) net. 55lb, 12 oz (25.3 kg) shipping.
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown ampli- fier—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new Crown amplifier is warranted to meet or exceed original specifications for the first three years of ownership. During this time, if your amplifier fails, or does not perform to original specifications, it will be repaired or replaced at our expense. About the only things not covered by this warranty are those losses normally covered by insurance and those caused by intentional abuse. And the coverage is transferable, should you sell your amplifier.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside of the USA, please contact your authorized Crown distributor for warranty information or call 574-294-8200.
Crown International 1718 W. Mishawaka Rd. Elkhart, IN 46517-9439 TEL: 574-294-8200 FAX: 574-294-8FAX www.crownaudio.com
Specifications subject to change without prior notice. Latest information available at www.crownaudio.com.
Grounded Bridge is a trademark and Crown, Crown Audio, ODEP and Micro-Tech are registered trademarks of Crown International. Other trademarks are the property of their respective owners. Printed in U.S.A.
© 2005 Crown Audio®, Inc.
