Harman crown DSi Series User Manual

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4 Advanced Features and Options
page 14
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 out p ut current limiting,
micro p rocessor-control l ed DC protection, and spec i al
t hermal protection for the unit's transformers and output
devices .
4.1.1 Output Current Limiting
Ou t pu t Curr ent Li mi ting circuit ry protects the amplifier
ou tput 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 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.
Thermal
Clip (red)
- 10
- 20
Signal
Re ady
Figure 4.1
DC Protection
4.1.3 Thermal Protection
T he T he r mal P rotection ci rcuit will ac t ivate if the in t ernal
heats ink temperature exceeds proper operating tempera-
tures (176° F, 80° C). When the heats i nk temperat u re has
fallen to a safe level, this protection circuit will automatically
be reset. P rincipal causes of thermal protection are:
1) I nadequate ventilation of the equipment rack
2) I ncorrect load impedance
3) Output cable short circuit
4) Blocked air vent
5) Heatsinks in need of cleaning
6) Coo l ing fan failure.
The cause of you r amplifie r 's thermal protec t ion state should
be determined and corrected as soon as possible Without
correction, the T hermal Protection circuit will typically
reactivate.
4.1.4 Attenuator Security Covers
The included attenuator security covers (Figure 42) can
replace the existing level-control knobs so that the amplifier
output level cannot be changed. The knobs snap into the
front panel.
Figure 4. 2 Attenu a tor Se c urit y Co ver
DSi Series Power Amplifiers
4.1.5 DSP Presets and Processes
OVERVIEW
Figure 4.3 shows the LC D 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.
T he amplifier is shipped with factory-default JBL
system presets. You can select the presets with the LCD
screen and Menu navigation buttons. T he ICONS in the
display illuminate to show which DSP functions are
currently in use for each prese t.
Also, you can configure user presets with your own
se tt ings. When you power off and back on, your settings will
be as t hey were when you shut off the ampl i fier. 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.harmanpro.com). Any custom settings
can't be saved by the front panel display, only by System
Architect software.
From the front panel, you can change settings for several of
the amplifier's DSP processes : crossovers, EO filters,
delay, and output limiting. The I CONS in the display
illuminate to show which DSP functions are currently
applied.
When you power-on the amplifier for the fi r st time, the L CD
screen displays DS P O FF (no DSP is applied). Subsequent
power-ans disp l ay the preset that was active when you shut
off the amplifier
ICONS
Sel / Enter Prev / Up
-
PRESET NAME OR
DSP SETTING
Next / Down
-
Figure 4.3 LCD Screen and Menu Navigation Buttons
Operation Manual

Harman crown DSi Series Specifications

General

Brand	Harman
Model	crown DSi Series
Category	Amplifier
Language	English