Table of Contents
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Table of Contents
Related Manuals for Crest Audio LT Series
Summary of Contents for Crest Audio LT Series
- Page 1 LT/ST Power Amplifier Owner’s Manual...
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Page 2: Important Precautions
important precautions Save the carton and packing materials! Should you ever need to ship the unit, use only the original factory packing. For replacement packaging, call Crest Audio’ s Customer Service Department directly. Read all documentation before operating your equipment. Retain all documentation for future reference. -
Page 3: Table Of Contents
how to use this manual introduction installation unpacking mounting cooling and ventilation powering maintenance features overview front panel rear panel operation modes stereo parallel bridged connections p.17 input output safety p.21 tourclass protection precautions user responsibility service and support support contact us registration specifications... -
Page 4: How To Use This Manual
how to use this manual conventions terms official Crest Audio features and each indicator or control on the amplifier will appear as: terms actions specific actions or selections the user can execute will appear as: actions tasks are broken down into steps warnings Procedures not to attempt. -
Page 5: Introduction
A traditional linear power supply is used in the LT Series. Because of the amplifier sections efficiency, (approx 93%) the transformer does not need to be as big or as heavy.This gives the LT Series an advantage in deliver- ing more power in a more compact package. -
Page 7: Installation
what to do with the shipping carton proper rack-mounting technique keeping the amplifier cooled required line voltages routine maintenance practices installation unpacking mounting cooling and ventilation powering maintenance p. 5... -
Page 8: Mounting
installation unpacking Please inspect the amplifier carefully immediately after unpacking. If you find any dam- age, notify your supplier/dealer immediately. Only the shipper may file a damage claim with the carrier for damage incurred during shipping. Be sure to save the carton and all packing materials for the carrier’s inspection. -
Page 9: Mounting
cooling and ventilation LT / ST amplifiers use a forced air cooling system to maintain a low,even operating tem- perature. Air is drawn in by a DC fan on the rear panel, flows through the cooling fins and then exhausts through the front panel vent. Heat sink temperature is monitored and controls the variable speed fan. -
Page 11: Features Overview
location of connectors and controls legend of panel symbols features overview front panel rear panel p. 9... - Page 12 features overview LT / ST shown p. 10 LT / ST owner’s manual...
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Page 13: Front Panel
front panel Rack Mounting Ears Two front-panel mounting holes are provided on each mounting ear. Channel Level attenuators Two input attenuators adjust level for their respective amplifier channels. In Bridged Mono and Parallel modes, the channel A attenuator controls overall signal level (see rear panel mode switch description). -
Page 14: Rear Panel
LT / ST shown rear panel IEC power connector Accepts a standard IEC terminated power cable Breaker Resettable circuit breaker - no fuses are used. Breaker can trip due to a power surge or over-voltage condition. If it trips once, reset it. If it continues to trip, the amplifier may need servicing. - Page 15 rear panel Output connections Speakers can be connected via the high current binding posts and the industry-standard Speakon (NL-4) connectors. Binding posts: One pair (Red- hot, Black- ground) per channel. Speakons - One connector for each channel. In Bridged Mono mode, the Speakon connector for Channel A is used exclusively (see Operation Modes).
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Page 17: Operation Modes
choosing the appropriate mode switching between operation modes special considerations when using bridged mode operation modes stereo parallel bridged p. 15... -
Page 18: Bridged
operation modes mode selection The three-position, recessed Mode Select switch (located on the rear panel) configures the amplifier for Stereo, Parallel or Bridged mode. Amplifiers are factory-configured for Stereo mode. Shut the amp off before changing modes. stereo In Stereo mode, both channels operate independently, with their input atten- uators controlling their respective levels.Signal at Channel A’s input produces output at Channel A’s output,while signal at Channel B’s input produces out- put at Channel B’s output.Recommended minimum nominal load impedance... -
Page 19: Input
proper wiring schemes for connectors: speakon correct signal paths: stereo, parallel and bridged connections binding post input XLR 1/4” TRS output Phoenix 3 pin p. 17... -
Page 20: Stereo Parallel
connections inputs LT / ST amplifiers are configured standard with pin 2 hot on female TRS pinouts outputs Speakers are connected using the high-current five-way binding posts or speakon connectors, or both. stereo/parallel Speaker + to PIN 1+ Speaker - to PIN 1- operation modes see—... -
Page 21: Stereo Mode
connections stereo mode five-way binding post connectors parallel mode five-way binding post connectors bridged mono mode five-way binding post connectors p. 19... -
Page 22: Output
connections stereo mode speakon output connectors parallel mode speakon output connectors bridged mono mode speakon output connectors Speaker + to PIN 1+ Speaker - to PIN 2+ p. 20 LT / ST owner’s manual... -
Page 23: Safety
the owner’s role in amplifier safety protecting your speakers description of TourClass protection features safety user responsibility speaker protection TourClass p. 21... -
Page 24: Tourclass Protection
safety user responsibility Your LT / ST Series amplifier is very powerful and can be potentially dangerous to loud- speakers and operators alike. It is your responsibility to read see the inside-front cover ) and make sure that the amplifier is installed, wired, and operated properly as instructed in this manual. -
Page 25: Tourclass Protection
safety TourClass protection ® Just like Crest Audio’s highly acclaimed Pro series amps, LT and ST amps incorporate TourClass protection features. Derived from Crest Audio’s extensive experience with the world’s largest sound rental companies, the TourClass group of circuits sets the industry standard for assured protection of internal amplifier circuits and all connected loads. -
Page 27: Service And Support
when to get support ways to contact Crest Audio service and support support contact us p. 25... -
Page 28: Contact Us
service and support support In the unlikely event that your amplifier develops a problem, it must be returned to an authorized distributor, service center or shipped directly to our factory. To obtain service, contact your nearest Crest Audio Service Center, Distributor, Dealer, or any of the worldwide Crest Audio offices. -
Page 29: Specifications
LT / ST Ω Ω Ω Ω Ω Ω 1/8 power, 4 Ω 1/3 power, 4 Ω idle 120 1/3 Power, 4 Ω, BTU/HR per channel net LT net ST 1000 1500 +0 / - 1 +0 / - 1 Ω... -
Page 30: Block Diagram
block diagram Channel A Inputs Phoenix Combicon 1/4” Female 3-Pin XLR Channel B Inputs Phoenix Combicon 1/4” Female 3-Pin XLR p. 28 ATTENUATOR OUTPUT STAGE ATTENUATOR MODE SWITCH OUTPUT STAGE A: STEREO B: PARALLEL C: BRIDGE LT / ST owner’s manual Channel A Outputs 5-Way... -
Page 31: Wire Gauge
stranded cable length wire gauge meters 0.75 meters 0.75 meters 0.75 meters 8 Ω load 4 Ω load 2.9% 5.6% 1.74 1.16 0.58 1.16 0.35 0.70 0.22 0.44 4.3% 8.2% 1.45 0.87 1.74 0.55 1.09 0.37 0.73 8.24% 5.5% 10.8 1.74 1.09 1.74... - Page 32 wire gauge feet feet feet feet p. 30 0.81% 1.61% 0.51 1.02 0.32 0.64 0.20 0.40 0.128 0.25 1.61% 3.2% 1.02 0.64 1.28 0.40 0.80 0.25 0.51 6.2% 11.9% 1.60 1.01 0.60 1.20 11.9% 14.6 1.20 LT / ST owner’s manual 3.2% 1.28 0.80...
- Page 34 http://www.crestaudio.com LT/ST Owner's Manual Version 1.3 03/21/02...