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I-Tech HD Series Power Amplifi ers
Operation Manual
page 11
3.2 Startup Procedure
When fi rst turning on your amplifi er, follow the procedures in the
Quick-Start Guide on page 4 (stereo) or page 5 (bridge-mono).
If you ever need to make any wiring or installation changes, don’t for get
to disconnect the power cord.
For help with determining your system’s optimum gain structure
(sig nal levels) please refer to the Crown Amplifi er Application Guide,
available online at www.crownaudio.com.
3.3 Precautions
Your amplifi er is protected from internal and external faults, but you
should still take the following precautions for optimum performance
and safety:
1. Before use, your amplifi er fi rst must be confi gured for proper
operation, including input and output wiring hookup. Improper
wiring can result in serious operating diffi culties. For information
on wiring and confi guration, please consult the Setup section of
this manual or, for advanced setup techniques, consult Crown’s
Amplifi er Application Guide available online at
www.crownaudio.com.
3 Operation
3.1 Protecting Your Speakers
It’s wise to avoid clipping the amplifi er signal. Not only does clipping
sound bad, it can damage high-frequency drivers. To prevent clipping,
use System Architect software’s Level Max suite to enable or display
the peak voltage limiter and average power limiter in your amplifi er’s
built-in DSP. That way, no matter how strong a signal your mixer
produces, the amplifi er output will not clip. Set the limiter threshold so
that mixer signals above 0 dB or 0 VU on the mixer meters do not quite
drive the amplifi er into clipping.
Also, avoid sending strong subsonic signals to the amplifi er. High-
level, low-frequency signals from breath pops or dropped micro-
phones can blow out drivers. To prevent subsonic signals, use one of
these methods:
• Insert a highpass fi lter between mixer output and amplifi er input (or
between mixer and limiter).
• Use the I-Tech’s onboard DSP to set up a highpass fi lters.
• Switch in highpass fi lters at your mixer. Set the fi lter to as high a
fre quency as possible that does not affect your program. For example,
try 35 Hz for music and 75 Hz for speech. On each mixer input channel,
set the fi lter frequency just below the lowest fundamental frequency of
that channel’s instrument.
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. WARNING: 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 amplifi er with the red Clip LEDs constantly
fl ashing.
7. Do not overdrive the mixer, which will cause clipped signal to be
sent to the amplifi er. Such signals will be reproduced with extreme
accuracy, and loudspeaker damage may result.
8. Do not operate the amplifi er with less than the rated load
imped ance. Due to the amplifi er’s output protection, such a
confi gura tion may result in premature clipping and speaker
damage.
9. CAUTION – SHOCK HAZARD: Potentially lethal voltages
exist at the output connectors when the amplifi er is
turned on and is passing a signal.
Remember: Crown is not liable for damage that results from
overdriv ing other system components.