Owner's manual

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I-Tech HD Series Power Ampliﬁers I-Tech HD Series Power Ampliﬁers

page 12

page 13

Operation ManualOperation Manual

Protecting Your Speakers

It’s wise to avoid clipping the ampliﬁer 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 ampliﬁer’s built-in DSP. That way, no matter how strong a signal your

mixer produces, the ampliﬁer 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 ampliﬁer into clipping.

Also, avoid sending strong subsonic signals to the ampliﬁer. 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 ﬁlter between mixer output and ampliﬁer input (or between mixer and limiter).

• Use the I-Tech’s onboard DSP to set up a highpass ﬁlters.

• Switch in highpass ﬁlters at your mixer. Set the ﬁlter 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

ﬁlter frequency just below the lowest fundamental frequency of that channel’s instrument.

Operation

Startup Procedure

When ﬁrst turning on your ampliﬁer, 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 Ampliﬁer Application Guide, available online at www.crownaudio.com.

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, your ampliﬁer ﬁrst must be conﬁgured for proper operation, including input and output wiring

hookup. Improper wiring can result in serious operating difﬁculties. For information on wiring and

conﬁguration, please consult the Setup section of this manual or, 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. 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 ampliﬁer with the red Clip LEDs constantly ﬂashing.

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 imped ance. Due to the ampliﬁer’s output protection,

such a conﬁgura tion may result in premature clipping and speaker damage.

9. CAUTION – SHOCK HAZARD: Potentially lethal voltages exist at the output connectors when the

ampliﬁer is turned on and is passing a signal.

Remember: Crown is not liable for damage that results from overdriv ing other system components.