Crown Audio 1201, 2401 Rear Panel Facilities Power Cord, Stereo/Mono Modes Switch, MT-XLR Module

Page 13

Micro-Tech Series Power Amplifiers

4 Operation

4.2.2 Rear Panel Facilities

F. Power Cord

All units are shipped with an approprate plug and cord for the required AC voltage.

G. Stereo/Mono Modes Switch

•Use Stereo mode for normal two-channel oper- ation.

•Use Bridge-Mono mode to drive a single chan- nel with a load impedance of at least 4 ohms.

•Use Parallel-Mono mode to drive a single channel with a load impedance less than 4 ohms.

Important: Turn off the amplifier before changing the Stereo/Mono modes switch.

H. Reset Switches (Micro-Tech 2400 only)

The Micro-Tech 2400 has two push-button reset swiches on the back panel that are used to reset the circuit breakers for the high-voltage power supplies. Refer to Section 5.1.5 in the rare event of a tripped breaker.

I. MT-XLR Module

This module provides two balanced XLR inputs. Because the MT-XLR connectors are in parallel with the amplifier’s built-in phone connectors, an input signal fed to either input can be fed to another amplifier from the unused connector for that chan- nel. If you prefer to use barrier block inputs instead, order the MT-BB accessory (see Section 5.2).

Input Sensitivity Switch

The three-position input sensitivity switch (Figure 4.2) is located inside the amplifier behind the MT- XLR module (I). See Section 3.7 for details.

J. Level Controls

Used to set the amplifier's output levels. These con- trols are on the back panel to prevent tampering. Be sure to turn down the Channel-2 level control (fully counterclockwise) when operating in Bridge-Mono or Parallel-Mono mode.

K. Balanced Phone Jack Inputs

A balanced ¼-inch phone jack input is provided for each channel. The jacks may be used with either

balanced (tip, ring and sleeve) or unbalanced (tip and sleeve) lines (refer to Figure 3.5). Balanced XLR ijnputs for each channel are provided with the MT-XLR module. Barrier-block input connectors are available with the MT-BB accessory (see Section 5.2.2). Caution: Do not use the Channel-2 input in either mono mode.

L. Ground Lift Switch

Used to isolate the phone jack signal grounds from the AC power (chassis) ground. Moving the switch to the "lift" position helps prevent the hum associ- ated with ground loops. Sliding the switch to the left isolates or "lifts" the grounds by placing an imped- ance between the sleeve of each phone jack and the AC ground.

M. Output Jacks

A pair of versatile binding posts is provided for out- put connection to each channel. Loudspeakers can be easily connected using banana plugs, spade lugs or bare wire (European models do not accept banana plugs). See Section 3.5.

MODEL: MICRO-TECH 2400 SERIES AC VOLTS: 120 AMPS: 17 60 Hz

MAXIMUM OUTPUT: 900 WATTS

PER CHANNEL INTO 2 OHMS AT 1 KHz WITH NO MORE THAN 0.1% THD.

REG. U.S. PAT. OFF.

4,330,809

4,611,180

PUSH TO RESET

 

STEREO

PARALLEL

BRIDGE

MONO

MONO

CAUTION: TURN OFF AMPLIFIER BEFORE CHANGING THIS SWITCH!

CAUTION:

THIS COVER IS NECESSARY FOR

EFFICIENT COOLING OF THE AMPLIFIER.

REMOVE ONLY TO ACCESS GAIN SWITCH.

THIS AMPLIFIER IS EQUIPPED WITH SELECTABLE INPUT SENSITIVITY. REMOVE COVER PLATE (ABOVE) TO ACCESS SENSITIVITY SWITCH.

 

 

6

 

CH-2

 

 

 

 

CH-1

6

 

 

 

 

5

7

 

 

 

 

 

 

5

7

 

 

 

4

 

 

8

 

 

 

 

 

4

 

 

8

 

 

3

 

 

9

 

 

 

 

 

3

 

 

9

 

BALANCED

2

 

 

10

 

INPUT GROUND LIFT

 

 

2

 

 

10

UNBALANCED

INPUT WIRING

1

 

 

11

 

 

 

1

 

 

11

INPUT WIRING

 

 

 

 

 

 

 

 

 

+ TIP

0

 

12

INPUT

LIFT

INPUT

0

 

12

 

+ TIP

– RING

GAIN

 

 

GAIN

 

 

GND SLEEVE

 

 

(AFFECTS PHONE

INPUTS ONLY.)

(MONO)

 

GND SLEEVE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BRIDGE-MONO WIRING

 

–

1

TURN AMPLIFIER OFF.

 

 

2

SET STEREO/MONO

OUTPUTS

+

 

SWITCH TO

 

BRIDGE-MONO.

CLASS 1

3 OUTPUT ACROSS

RED TERMINALS

OUTPUT

ONLY. (CH-1

WIRING

IS POSITIVE.)

REQUIRED.

 

CH-2

CH-1

PARALLEL-MONO WIRING

 

 

+

1

TURN AMPLIFIER OFF.

WARNING: TO REDUCE THE RISK OF FIRE OR

 

2

SET STEREO/MONO

–

 

SWITCH TO

ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT

 

PARALLEL-MONO.

TO RAIN OR MOISTURE.

 

 

 

 

 

 

3

ADD JUMPER (14

 

 

GAGE OR LARGER)

 

® INTERNATIONAL, INC.

ACROSS RED

 

TERMINALS.

ELECTRONIC EQUIPMENT

 

ELKHART, IN 46517

4

OUTPUT ACROSS CH-1

MADE IN U.S.A.

0000

TERMINALS ONLY.

SERIAL NUMBER

000000

 

F

G

H

I J

K

L

K

J

M M

 

 

 

 

Figure 4.2 Rear Panel Connectors and Controls

 

Operation Manual

 

 

 

 

 

 

 

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Contents Some models may be exported under the name Amcron Micro-Tech 600, 1200 601, 1201102990-8 06/04Output wiring Important Safety InstructionsUse only with a cart, stand, bracket, or table Declaration of Conformity Safety StandardCrown International, Inc European Representative’s Name and AddressTable of Contents Features Welcome How to Use This ManualUnpacking Your Amplifier Install Your Amplifier SetupYou may also stack amps without using a cabi- net Ensure Proper CoolingShows connector pin assignments for Choose Input Wire ConnectorsOutput Connections Choose Output Wire and Con- nectorsBridge-Mono Mode Wire Your System Stereo ModeInputs Connect input wiring to Channel 1 only Parallel-Mono ModeStartup Procedure Set Ground Lift SwitchSet Input Sensitivity Connect to AC MainsOperation PrecautionsDo Not operate the amplifier with the Odep LEDs turning off Enable Indicator Odep Indicators Output Device Emulation ProtectionPower Switch Dust FilterStereo/Mono Modes Switch Rear Panel Facilities Power CordReset Switches Micro-Tech 2400 only Input Sensitivity SwitchAdvanced Features Options Input Connectors Option Accessories Cooling Fan OptionsFilter Cleaning Overview Principles of OperationCircuit Theory Stereo Operation Circuit Block DiagramParallel-Mono Operation Bridge-Mono OperationHigh-voltage power supply fuse or breaker has blown TroubleshootingEnergy reserve for the affected channel is dip- ping Supply and fan are still working120 VAC, 60 Hz Units, Bridge mono mode Specifications120 VAC, 60 Hz Units, Parallel mono mode Dimensions Width, Height, Depth Power Draw at IdleWeight 120VAC, 60-Hz units Net Weight Shippping WeightAC Power Draw Thermal Dissipation AC Power Draw Thermal Dissipation Micro-Tech Series Power Amplifiers 12/01 WarrantyWorldwide Except USA & Canada Visa Crown Factory Service InformationPurchase Order for Crown Dealer Card Number Exp. Date

MT-601, 1201, 2401 specifications

Crown Audio is synonymous with high-performance amplifiers, and their models 1201, 2401, and MT-601 embody the brand's commitment to quality and reliability in sound reinforcement. Each model caters to different needs, making them valuable assets in live sound and installation applications.

The Crown 1201 amplifier is designed for versatility, providing 120 watts per channel at 8 ohms. This model features Crown's patented "Power Factor Control," which ensures maximum power delivery with minimal distortion and heat generation. The 1201 is lightweight yet rugged, making it ideal for portable applications. It's equipped with comprehensive protection circuitry, including short circuit and thermal protection, safeguarding both the amplifier and connected speakers.

Moving to the Crown 2401, it ups the power with 240 watts per channel at 8 ohms. The 2401 also employs Crown's advanced input circuitry, which enhances audio clarity and reduces noise. Its design includes an intelligent cooling system with variable-speed fans, accommodating demanding situations while ensuring quiet operation. The amplifier's robust build quality and efficient power usage make it a favorite among sound engineers who require both reliability and performance.

The MT-601 is a versatile addition to Crown's lineup, known for its flexibility in various applications. Delivering 300 watts per channel at 8 ohms, the MT-601 features an advanced monitoring system that provides real-time feedback on system performance. This capability allows sound technicians to make adjustments on the fly, optimizing sound quality. The MT-601's lightweight chassis and modern design make it easy to integrate into any setup.

All three models embody Crown Audio's dedication to innovation through technologies such as output peak limiter and gain monitoring, which prevents signal clipping and distortion. They also feature variable-speed cooling fans that adapt based on the amplifier's thermal load, ensuring efficiency without compromising performance.

In summary, Crown Audio’s 1201, 2401, and MT-601 amplifiers showcase the brand’s expertise in delivering powerful, reliable audio solutions. With their unique features, robust build quality, and advanced technologies, these amplifiers meet the diverse needs of both live performance environments and fixed installations, making them an ideal choice for audio professionals.
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