DAD DXZ88 Manuale d'uso - Pagina 8

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1. Functions and Settings

FUNCTIONS AND SETTINGS

SYSTEM SETUP AND GAIN STRUCTURE

This product offers a wide range of tools for sound system design and setup. These tools can make your

system more efficient and better sounding, but to get the best possible sound it is important to use these

tools properly.

The following section explains how to maximize system gain and how to use the limiters to protect your

amplifiers from clipping. In traditional system design, the output of your console would be routed to a

system EQ, a compressor, and a crossover with output level control. From the crossover, there may be

additional filters that are employed to improve the response of your speakers. There may also be limiters

set up to keep

your amplifiers from going into clipping and protect your speakers from the hazards of a clipped signal.

Your amplifiers play a vital role in system setup, because they are last item in the chain before your speak-

ers and offer the greatest amount of gain (that is their job after all). If your limiters and amplifiers are incor-

rectly setup you will not be using your system to its fullest potential and could be harming your speakers.

To ensure an optimal gain structure:

Play a signal at the nominal level from your mixing desk, and set the input gain of your processor to 0.

Set the crossovers that you want to use, while keeping the output gains also at 0.

With DISCONNECTED loudspeakers, turn up the volume of the power amplifiers entirely clockwise (full

volume).

Now reduce the output gain and / or the output limiter setting to get the desired gain, so that the ampli-

fier is just clipping and the built-in limiters of your processor are just limiting. If the amplifier does not have

a built-in clip limiter, set your processor's limiter so that the amplifier does not clip.

Now turn down the volume of the power amplifiers, connect your speakers, and slowly increase the vol-

ume while checking the sound.

If all is well, there should be distortion-free sound, and the limiter LEDs are flashing or off, but not continu-

ously on. If they are continuously on, reduce the output gain of your processor.

If you cannot reach enough signal level, increase the processor's input gain or turn up the level from your

mixing desk.

SETUP AND OPERATION

Before plugging the processor in, always make sure that the power supply matches the product specifica-

tion voltage. Install this device on a flat, stable surface, not bent or curved. Do not supply power before

all components of the system are set up and connected properly. Make sure your power amplifiers are

switched on last in order to avoid transients, which could damage your speakers or annoy your audience.

System Check

1 .

After connecting all cables, you should mute all outputs first or turn the gain/level setting on your amplifi-

ers to minimum. Activate the HF-outputs first. In case of wrong cabling, High Frequency (HF) audio signals

will come out of bass-speakers that cannot be harmed this way. Vice versa, the Low Frequency (LF) audio

signals would destroy your HF-speakers. It is advisable to install a large capacitor in series with HF drivers

(47 - 100 uF). That way, drivers are somewhat protected against accidental instrumentation errors.

Input Setup

2 .

Press the Channel Up or Down button to select the input channel you wish to edit. Make the first settings

with the output turned low or muted.

To toggle through the different items, press the Item Up or Item Down buttons.

DXZ48