Справочник Пользователя для Behringer Musical Instrument Amplifier FBQ3102

ULTRAGRAPH PRO FBQ1502/ULTRAGRAPH PRO FBQ3102/ULTRAGRAPH PRO FBQ6200

Try to orient yourself on a frequency whose signal

level lies in the 0 dB to -3 dB range in order to avoid

overdriving the equipment connected (e.g. power

amplifier, crossover).

2.3.3 Subwoofer section

The LED display indicates the signal level present at the

SUB OUT connector.
The signal level present at the subwoofer output connector

can be adjusted by using the LEVEL control.
To activate the subwoofer output, please depress the

SUBWOOFER switch.

In general, the location of a subwoofer is not critical, since the

source of deeper freqencies is not easily determined. However,

to achieve optimal sound resolution, you should try to position

the subwoofer in a central location between the two main

speakers. This way, you minimize run-time differences and the

sound quality deterioration associated with them.

3. APPLICATION EXAMPLES

The flexible concept of the ULTRAGRAPH PRO models, with

the diverse possibilities in sound processing, open up an entire

range of application possibilities for you.

Fig. 3.1: The ULTRAGRAPH PRO FBQ6200

as master equalizer

3.1 Master equalizer in sound

reinforcement systems

This diagram shows a typical set-up with the ULTRAGRAPH PRO

models (see fig. 3.1).

To achieve optimal results, you should pay attention to several

issues:

Before you start correcting the frequency response of a setup,

it is advisable to first let the music and other sound sources run

uncorrected, as this is something that has proven itself in

practice. If distortion occurs, such overdriving is the first issue

to be overcome in your setup. Loudspeaker location is also very

important. No equalizer in this world can significantly correct the

dull sound created through reflexion of wall structures and

ceilings. Often, very dramatic improvements can be made by

simply placing and aligning speakers correctly.

If you are using an active multi-way system you should take

some run-time and phase correction measures before you work

with the ULTRAGRAPH PRO (our crossover network SUPER-X PRO

CX3400 provides all the necessary tools with its variable split

frequencies, phase reverse switches and electronic run-time

correction facility). Only after making these preliminary adjustments

should you start implementing them on your ULTRAGRAPH PRO.

Disturbing noise (e. g. mains-induced hum) as well as narrow-

band resonances should first be tackled by using the

ULTRAGRAPH PRO (also see ch. 3.2.1). You should definitely

perform all these adjustments before modifying the overall sound.

Now you have a basic setup and now its time to start fine-

tuning your sound.
Some ground rules:

A linear response curve is not ideal for every application. For

example, when dealing with the spoken word, intelligibility is what

is most important. Therefore, the transmission curve should drop

off in the bass segment of the signal because otherwise only

interference is transmitted.

In general, extremely low and high frequencies are transmitted

with much lower amplitudes. There is no sense in forcing a

small full-range speaker to reproduce frequencies below 50 Hz;

apart from a need for higher power reserves, speaker damage

will be the most likely result.

Always respect the physical limitations of your

system.

After setting up your system as precisely as possible to the

desired transmission curve, walk around the venue in order to

get an impression of what your signal sounds like in different

locations. Do not forget to take regular breaks while you do this,

and also try to use various program sources to truly develop a

feeling for what your system really sounds like and how the

venue carries the sound.

Setting up your equalizer well takes a lot of time and

patience! If you notice that only extreme settings on

your equalizer create a usable frequency response,

this is probably a good indication that a cardinal

mistake may have been committed elsewhere in

the P.A. system or room acoustics.

An equalizer is no solution for bad equipment, but it is an

extremely useful and effective sound tool for musical fine-tuning.

Fine-tuning often leads to amazing improvements in acoustic

penetration and in the overall sound quality of your entire setup.

3. APPLICATION EXAMPLES