Crown MA-2402, Macro-Tech 2402 Service manual

4.2 (5)

Macro-Tech 2402

Operation Manual

Obtaining Other Language Versions: To obtain information in another language about the use of this product, please contact your local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.

This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance.

The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.

Trademark Notice: Crown, Crown Audio, Amcron, Macro-Tech and ODEP are registered trademarks of Crown International. PIP and

Grounded Bridge are trademarks of Crown International. Other trademarks are the property of their respective owners.

Some models may be exported under the name Amcron.®

©2005 by Crown Audio®, Inc. 1718 W. Mishawaka Rd., Elkhart, Indiana 46517-9439 U.S.A. Telephone: 574-294-8000

127240-7 8/05

MA 2402 Power Amplifier

Important Safety Instructions

1)Read these instructions.

2)Keep these instructions.

3)Heed all warnings.

4)Follow all instructions.

5)Do not use this apparatus near water.

6)Clean only with a dry cloth.

7)Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8)Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

9)Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding-type plug has two blades and a third grounding prong. The wide blade or the third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.

10)Protect the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

11)Only use attachments/accessories specified by the manufacturer.

12)Use only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.

13)Unplug this apparatus during lightning storms or when unused for long periods of time.

14)Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as powersupply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

15)WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR MOISTURE.

16)DO NOT EXPOSE TO DRIPPING OR SPLASHING. DO NOT PLACE OBJECTS FILLED WITH LIQUID, SUCH AS VASES,ON THIS APPARATUS.

TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ PAS LES COUVERCLES. IL N’Y A PAS DES PARTIES SERVICEABLE À L’INTÉRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL QUALIFIÉ SEULMENT.

TO COMPLETELY DISCONNECT THIS EQUIPMENT FROM THE AC MAINS, DISCONNECT THE POWER SUPPLY CORD PLUG FROM THE AC RECEPTACLE. THE MAINS PLUG OF THE POWER SUPPLY CORD SHALL REMAIN READILY OPERABLE.

WATCH FOR THESE SYMBOLS:

The lightning bolt triangle is used to alert the user to the risk of electric shock.

The exclamation point triangle is used to alert the user to important operating or maintenance instructions.

IMPORTANT

The MA-2402 amplifier requires Class 1 output wiring.

MAGNETIC FIELD

CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly above or below the unit. Because this amplifier has a high power density, it has a strong magnetic field which can induce hum into unshielded devices that are located nearby. The field is strongest just above and below the unit. Do not mount or use this product within 50 cm of sensitive equipment.

If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the preamplifier or other sensitive equipment at the top.

FCC COMPLIANCE NOTICE

This device complies with part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.

Increase the separation between the equipment and receiver.

Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

Consult the dealer or an experienced radio/TV technician for help.

page 2

Operation Manual

MA 2402 Power Amplifier

Crown International, Inc.

DECLARATION of CONFORMITY

TCF Technical Certificate No: P4300CRI1.IWS

 

Technical Construction File Route

Issued By: Crown International, Inc.

FOR COMPLIANCE QUESTIONS ONLY: Sue Whitfield

1718 W. Mishawaka Road

574-294-8289

Elkhart, Indiana 46517 U.S.A.

swhitfield@crownintl.com

 

 

Competent Body’s Name and Address:

European Representative's Name and Address:

Technology International (Europe) Limited

Nick Owen

41-42 Shrivenham Hundred Business Park,

35, Bassets Field

Shrivenham, Swindon, Wilts, SN6 8TZ

Thornhill

Equipment Type: Commercial Audio Power Amplifiers

Cardiff. South Glamorgen

CF14 9UG United Kingdom

Family Name: Macro-Tech

 

Model Names: Macro-Tech 2402

 

EMC Standards:

EN 55103-1:1995 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions

EN 55103-1:1995 Magnetic Field Emissions-Annex A @ 10 cm and 1 M

EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current ≤16A per phase)

EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current ≤16A

EN 55022:1992 + A1: 1995 & A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class B

EN 55103-2:1996 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity

EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)

EN 61000-4-3:1996 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)

EN 61000-4-4:1995 Electrical Fast Transient/Burst Immunity (Criteria B)

EN 61000-4-5:1995 Surge Immunity (Criteria B)

EN 61000-4-6:1996 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)

EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variation

Safety Standard:

EN 60065: 1998 Safety Requirements - Audio Video and Similar Electronic Apparatus

I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.

Signed

Larry Coburn

 

Title: Senior Vice President of Manufacturing

Date of Issue: March 28, 2000

 

Operation Manual

Due to line current harmonics, we recommend that you contact your supply authority before connection.

page 3

MA 2402 Power Amplifier

Table of Contents

Important Safety Instructions ..........................

2

5.1.2 Standby Mode ..........................................

14

Declaration of Conformity ................................

3

5.1.3 Transformer Thermal Protection ...............

14

1 Welcome ...................................................

5

5.1.4 Fuses and Circuit Breakers.......................

15

1.1

Features ..............................................

5

5.2 Advanced Features ...........................................

15

2 How to Use This Manual .......................

5

5.3 Options.............................................................

16

3 Setup .........................................................

6

5.3.1 PIP and PIP2 Modules ............................

16

3.1

Unpack Your Amplifier ........................

6

5.3.2 Cooling Fan Options ...............................

17

3.2

Install Your Amplifier ..........................

6

5.3.3 Level Control Shaft Lock .........................

17

3.3

Ensure Proper Cooling ........................

6

6 Troubleshooting ....................................................

18

3.4

Choose Input Wire and Connectors ....

7

7 Theory of Operation .............................................

19

3.5

Choose Output Wire and Connectors...

7

7.1 Overview...........................................................

19

3.6

Wire Your System ...............................

8

7.2 Circuit Theory...................................................

19

3.6.1 Stereo Mode ................................

8

7.2.1 Stereo Operation.......................................

19

3.6.2 Bridge-Mono Mode .....................

8

7.2.2 Bridge-Mono Operation............................

20

3.6.3 Parallel-Mono Mode ....................

9

7.2.3 Parallel-Mono Operation ..........................

20

3.7

Set Input Sensitivity ............................

10

8 Specifications........................................................

21

3.8

Connect to AC Mains ..........................

10

9 AC Power Draw and Thermal Dissipation .......

25

3.9

Startup Procedure ...............................

10

10 Service .................................................................

27

4 Operation ..................................................

10

10.1 International and Canada Service ...................

27

4.1

Precautions .........................................

10

10.2 US Service......................................................

27

4.2

Front Panel Controls and Indicators ....

11

10.2.1 Service at a US Service Center ...............

27

4.3

Back Panel Controls, Indicators and

 

10.2.2 Factory Service.......................................

27

 

Connectors .........................................

12

10.2.3 Factory Service Shipping Instructions ....

27

4.4

Indicators ............................................

13

10.2.4 Packing Instructions...............................

27

5 Advanced Features and Options ..........

14

10.2.5 Estimate Approval...................................

27

5.1

Protection Systems ..............................

14

10.2.6 Payment of Non-Warranty Repairs..........

27

5.1.1 ODEP ............................................

14

11 Warranty...............................................................

28

 

 

 

Factory Service Information Form .........................

31

page 4

Operation Manual

MA 2402 Power Amplifier

MA-2402

*1 kHz **20 Hz–20 kHz

Power

Power

2 ohm Dual (per ch.)

1,050W

850W

4 ohm Dual (per ch.)

800W

750W

8 ohm Dual (per ch.)

520W

505W

4 ohm Bridge-Mono

2,070W

1,670W

8 ohm Bridge-Mono

1,585W

1,485W

*1 kHz Power: refers to maximum average power in watts at 1 kHz with 0.1% THD.

**20 Hz–20 kHz Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD.

1 Welcome

Congratulations on purchasing the renowned Crown® Macro-Tech® 2402 power amplifier. It is designed to provide enormous levels of pure, undistorted power in a rugged, low-profile package — making it the choice for pro sound reinforcement. It utilizes our patented ODEP® protection circuitry to keep the show going long after other amplifiers have shut down. And with its PIPexpandability, the amplifier can be easily customized with one of our many optional input modules (see Section 5 for a list of available PIPs).

Modern power amplifiers are sophisticated pieces of engineering capable of producing extremely high power levels. They must be treated with respect and correctly installed if they are to provide the many years of reliable service for which they were designed.

In addition, the Macro-Tech 2402 amplifier includes a number of features which require some explanation before it can be used to its maximum advantage.

Please take the time to study this manual so that you can obtain the best possible service from your amplifier.

1.1 Features

Crown’s Grounded-Bridge™ design delivers large voltage swings without using easily stressed output-transistor configurations like conventional amplifiers. The results are lower distortion and superior reliability.

Patented ODEP (Output Device Emulation Protection) circuitry compensates for

overheating and overload to keep the amplifier working when others would fail.

Complete protection against shorted, open, and mismatched loads, overheating, DC, high-frequency overload, and full internal fault protection provided by our latest protection scheme: “Quad-Mute.”

Two mono modes (Bridge-Mono and Parallel-Mono) for driving a wide range of load impedances.

Dedicated power supply transformers isolate channels in Stereo mode for superb crosstalk characteristics and reliability — each channel is virtually a separate amplifier.

High damping factor provides superior control over low-frequency drivers for a clean, accurate low end.

PIP (Programmable Input Processor) connector accepts accessories that tailor the amplifier to suit specific applications.

Enhanced PIP2™ (Programmable Input Processor) connector accepts new accessory modules that further tailor the amplifier to suit specific applications, including wideband load current monitoring.

Backed by the industry’s ONLY three-year, no-fault, fully transferable warranty.

Operation Manual

2 How to Use This Manual

This manual provides you with the necessary information to safely and correctly set up and operate your amplifier. It does not cover every aspect of installation, setup or operation that might occur under every condition. For additional information, please consult Crown’s

Amplifier Application Guide (available online at www.crownaudio.com), Crown Technical Support, your system installer or retailer.

We strongly recommend you read all instructions, warnings and cautions contained in this manual. Also, for your protection, please send in your warranty registration card today. And save your bill of sale—it’s your official proof of purchase.

page 5

Crown MA-2402, Macro-Tech 2402 Service manual

MA 2402 Power Amplifier

3 Setup

3.1 Unpack Your Amplifier

3.2 Install Your Amplifier

3.3 Ensure Proper Cooling

Please unpack and inspect your amplifier for any damage that may have occurred during transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will be happy to help as needed. Save the shipping carton as evidence of damage for the shipper’s inspection.

We also recommend that you 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.

YOU WILL NEED (not supplied):

Input wiring cables

Output wiring cables

Rack for mounting amplifier (or a stable surface for stacking)

WARNING: Before you start to set up your amplifier, make sure you read and observe the Important Safety Instructions at the beginning of this manual.

CAUTION: Before you begin, make sure your amplifier is disconnected from the power source, with power switch in the “off” position and all level controls turned completely down (counterclockwise).

Use a standard 19-inch (48.3-cm) equipment rack. See Figure 3.1 for amplifier dimensions.

You may also stack amps without using a cabinet.

NOTE: When transporting, amplifiers should be supported at both front and back.

 

LEVEL

 

 

 

LEVEL

 

12

15

 

 

12

15

 

18

 

ODEP

18

 

9

21

 

9

21

 

 

 

 

 

 

 

ON

6

24

 

SIGNAL / IOC

6

24

OFF

 

 

 

 

 

 

 

 

 

 

3.5 in

3

27

 

 

3

27

0

30

CH1

CH2

0

30

ENABLE

 

 

 

 

 

 

8.9 cm

19 in

48.3 cm

When using an equipment rack, mount units directly on top of each other. Close any open spaces in rack with blank panels. DO NOT block front or rear air vents. The side walls of the rack should be a minimum of 2 inches (5.1 cm) away from the amplifier sides, and the back of the rack should be a minimum of 4 inches (10.2 cm) from the amplifier back panel.

Figure 3.2 illustrates standard amplifier airflow.

Figure 3.2 Airflow

SIDE VIEW

16 in

2.5 in

40.6 cm

6.35 cm

Figure 3.1 Dimensions

page 6

Operation Manual

MA 2402 Power Amplifier

3 Setup

3.4 Choose Input Wire

and Connectors

Crown recommends using pre-built or professionally wired, balanced line (two-conductor plus shield), 22-24 gauge cables and connectors.The factory-installed PIP2-FXQ input module accepts 3-pin male XLR connectors or TRS phone connectors. Other PIP modules accept XLR, phone or Phoenix connectors, or bare wires.

Regarding the PIP2-FXQ, Figure 3.3 shows connector pin assignments for balanced wiring, and Figure 3.4 shows connector pin assignments for unbalanced wiring.

NOTE: Custom wiring should only be performed by qualified personnel.

3.5 Choose Output Wire and Connectors

Crown recommends using pre-built or professionally wired, high-quality, two-conductor, heavy gauge speaker wire. Use bare wire, a dual banana plug or spade lugs on the amplifier end of each speaker cable (Figure 3.5). To prevent the possibility of short-circuits, wrap or otherwise insulate exposed loudspeaker cable connectors.

Using the guidelines below, select the appropriate size of wire based on the distance from amplifier to speaker.

Distance

Wire Size

up to 25 ft.

16 gauge

26-40 ft.

14 gauge

41-60 ft.

12 gauge

61-100 ft.

10 gauge

101-150 ft.

8 gauge

151-250 ft.

6 gauge

CAUTION: Never use shielded cable for output wiring.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3.3 Balanced Input

 

 

Figure 3.4 Unbalanced Input

 

Connector Wiring

 

 

 

 

 

Connector Wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 3.5 Output Connector Wiring

Operation Manual

page 7

MA 2402 Power Amplifier

3 Setup

3.6 Wire Your System

Turn down the Level controls (fully counterclockwise) and turn off the amplifier before wiring it as described below.

3.6.1 Stereo Mode

See Figure 3.6. Set the back panel stereo/mono

switch to Stereo.

Figure 3.6 Stereo Wiring

INPUTS: Connect input wiring to both channels.

OUTPUTS: Maintain proper polarity (+/-) on output connectors.

Connect Channel 1 positive (+) speaker load to Channel 1 positive terminal of amp; repeat for negative (-). Repeat Channel 2 wiring as for Channel 1.

3.6.2 Bridge-Mono Mode

See Figure 3.7. Set the back panel stereo/mono switch to Bridge-Mono.

INPUTS: Connect input wiring to Channel 1 only.

OUTPUTS: Connect the speaker across the positive terminals of each channel. Do not use the negative terminals when the amp is being operated in Bridge-Mono mode.

NOTE: The Channel 2 Level control should

Figure 3.7 Bridge-Mono Wiring

 

be set fully counter-clockwise when operat-

 

ing the amplifier in Bridge-Mono mode.

 

CAUTION: Be certain all equipment (meters,

 

switches, etc.) connected to the mono out-

 

put is balanced. To prevent oscillations,

 

both sides of the line must be isolated from

 

the input grounds.

 

page 8

Operation Manual

MA 2402 Power Amplifier

3 Setup

3.6.3 Parallel-Mono Mode

Figure 3.8

Parallel-Mono

Wiring

See Figure 3.8. Set the back panel stereo/mono switch to Parallel-Mono.

INPUTS: Connect input wiring to Channel 1 only.

OUTPUTS: Add a 14 gauge (or larger) jumper between the red(+) Channel 1 and Channel 2 binding posts. Connect the speaker positive (+) lead to the Channel 1 red (+) terminal. Connect the speaker negative (-) lead to the Channel 1 black (-) terminal.

Crown provides a reference of wiring pin assignments for commonly used connector types in the Crown Amplifier Application Guide.

NOTE: Use only the Channel 1 level control.

CAUTION: Parallel-Mono wiring requires installation of a jumper wire. Do not switch to Stereo or Bridge-Mono mode until this output jumper wire is removed.

NOTE: The Channel 2 IOC indicator will remain lit when operating in Parallel-Mono mode.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Operation Manual

 

page 9

MA 2402 Power Amplifier

3 Setup

3.7 Set Input Sensitivity

The input sensitivity switch inside the amplifier is set to 0.775 volt RMS at the factory. (Factory setting for international models is 1.4V). It can be changed to 1.4 volts or a voltage gain of 26 dB. The 26 dB gain setting is equivalent to a sensitivity of 3.1 volts for the Macro-Tech 2402.

To change the input sensitivity:

1. Turn off and unplug the amplifier from the AC source.

2. Remove the input module on the back panel.

3. Locate the labeled access hole for the sensitivity switch (Figure 3.9). The sensitivity switch will not be visible because it is mounted below the hole.

Use your little finger to reach it.

4. Set the switch to the desired position.

5. Replace the input module.

SENSITIVITY SWITCH INSIDE ACCESS HOLE

1.4 V

26 dB

0.77 V

Figure 3.9 Input Sensitivity Switch

3.8 Connect to AC Mains

Connect your amplifier's power cord to the AC mains power source (power outlet).

WARNING: The third prong of this connector (ground) is an important safety feature. Do not attempt to disable this ground connection by using an adapter or other methods.

Amplifiers don't create energy. The AC mains voltage and current must be sufficient to deliver the power you expect. You must operate your amplifier from an AC mains power source with not more than 10% variation above or below the amplifier's specified line voltage and within the specified frequency requirements (indicated on the amplifier's back panel label). If you are unsure of the output voltage of your AC mains, please consult your electrician.

3.9 Startup Procedure

Use the following procedure when first turning on your amplifier:

1.Turn down the level of your audio source.

2.Turn down the Level controls of the amplifier.

3.Turn on the Power switch. The Enable indicator next to the Power switch should glow. The amber ODEP lights should also be glowing.

4.Turn up the level of your audio source to an optimum level.

5.Turn up the Level controls on the amplifier until the desired loudness or power level is achieved.

6.Turn down the level of your audio source to its normal range.

If you ever need to make any wiring or installation changes, don't forget to disconnect the power cord.

For help with determining your system's optimum gain structure (signal levels) please refer to the Crown Amplifier Application Guide, available online at www.crownaudio.com.

4 Operation

4.1 Precautions

Your amplifier is protected from internal and external faults, but you should still take the following precautions for optimum performance and safety:

1.Before use, configure your amplifier for proper operation as described in the Setup section of this manual. Improper wiring can result in serious operating difficulties. For advanced setup techniques, consult Crown's Amplifier Application Guide available online at www.crownaudio.com.

2.Use care when making connections, selecting signal sources and controlling the output level. The load you save may be your own!

3.Do not short the ground lead of an output cable to the input signal ground. This may form a ground loop and cause oscillations.

4.Never connect the output to a power supply, battery or power main. Electrical shock may result.

5.Tampering with the circuitry, or making unauthorized circuit changes may be hazardous and invalidates all agency listings.

6.Do Not operate the amplifier with the IOC LED constantly flashing bright green.

7.Do Not overdrive the mixer, which will cause clipped signal to be sent to the amplifier. Such signals will be reproduced with extreme accuracy, and loudspeaker damage may result.

8.Do Not operate the amplifier with less than the rated load impedance. Due to the amplifier's output protection, such a configuration may result in premature clipping and speaker damage.

Crown is not liable for damage that results from overdriving other system components.

page 10

Operation Manual

Loading...
+ 22 hidden pages