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Crown Audio CDi 4000 Operation Manual

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CDi Series Power Amplifiers

Operation Manual

CDi Series Power Amplifiers

Operation Manual page 15

4 Advanced Features and Options

Figure 4.1

DC Protection

NOTE: For detailed information about these Crown

amplifier features, please consult the Crown

Amplifier Application Guide, available on the

Crown website at www.crownaudio.com.

4.1 Protection Systems

Your Crown amplifier provides extensive protection and

diagnostic capabilities, including output current limiting,

microprocessor-controlled DC protection, and special

thermal protection for the unit’s transformers and output

devices.

4.1.1 Output Current Limiting

Output Current Limiting circuitry protects the amplifier

output stage from damage caused by short-circuit loads.

4.1.2 DC Protection

DC Protection shuts down the amplifier in the event of an

output DC offset exceeding 2V. In the majority of cases, DC

protection is indicative of a faulty amplifier channel, and will

be accompanied by an illuminated red Clip LED, even with

no input connected and level controls set at minimum

(Figure 4.1). If this is the case, contact your dealer or service

center.

4.1.3 Thermal Protection

The Thermal Protection circuit will activate if the internal

heatsink temperature exceeds proper operating tempera-

tures (176°F, 80°C). When the heatsink temperature has

fallen to a safe level, this protection circuit will automati cally

be reset. Principal causes of thermal protection are:

1) Inadequate ventilation of the equipment rack

2) Incorrect load impedance

3) Output cable short circuit

4) Blocked air vent

5) Heatsinks in need of cleaning

6) Cooling fan failure.

The cause of your amplifier’s thermal protection state should

be determined and corrected as soon as possible. Without

correction, the Thermal Protection circuit will typically

reactivate.

4.1.4 Non-Touch Cover

Located over the amplifier output terminals, this included

accessory provides a shock-proof cover for the output

ter minals.

1. Remove the screw holding the cover onto the amplifier

back panel, and remove the cover. Keep the screw.

2. The cover has two tabs A and B (Figure 4.2). Insert tab A

into the slot just to the left of the output terminals (Fig ure

4.3).

3. Put the screw through tab B, and screw it into the hole

just to the right of the output terminals (Figure 4.3).

4.1.5 Attenuator Security Covers

The included attenuator security covers (Figure 4.4) can

replace the existing level-control knobs so that the

ampli fier output level cannot be changed. The knobs snap

into the front panel.

Tab A

Tab B

Non-touch cover

Figure 4.2 Interior of Non-Touch Cover

Tab A

Tab B

Non-touch cover

Figure 4.3 Cover Placement

Over Output Terminals

Figure 4.4 Attenuator Security Cover

4 Advanced Features and Options (continued)

Figure 4.5 LCD Screen and Menu

Navigation Buttons

Figure 4.6 Menu Tree

4.1.6 DSP Presets and Processes

OVERVIEW

Figure 4.5 shows the LCD screen and the three Menu

navigation buttons: Sel/Enter, Prev/Up and Next/Down.

These buttons let you step through the menu items

displayed on the screen.

You can configure USER PRESETS with your own set tings.

When you power off and back on, your settings will be as

they were when you shut off the amplifier. However, if you

recall a user preset, all its DSP will be off– unless you had

saved the preset using System Architect software (a free

download from www.harman pro.com). Any custom settings

can’t be saved by the front panel display, only by System

Architect software.

The ICONS in the display illuminate to show which DSP

functions are currently in use for each preset.

You can select the presets with the LCD screen and Menu

navigation buttons.

From the front panel, you can change settings for several of

the amplifier’s DSP processes: cross overs, EQ bypass,

delay, 70V mode, and output lim iting. The ICONS in the

display illuminate to show which DSP functions are

currently applied.

When you power-on the amplifier for the first time, the LCD

screen displays DSP OFF (no DSP is applied). Subsequent

power-ons display the preset that was active when you shut

off the amplifier.

Figure 4.6 shows the Menu Tree, which is the navi gation

path of options in the Menu. Later in this manual is a table

that shows how to access various presets and DSP

processes

.

On the next page is a description of each block in the Menu Tree.