Behringer GEQ3102 User Manual

Page 9

ULTRA-GRAPH PRO GEQ3102

2.1 Master equalizer in sound reinforcement systems

This is the ULTRA-GRAPH PROs probably most common field of application.

Fig. 2.1: The ULTRA-GRAPH PRO as a master equalizer

Please note the following points to achieve optimum results:
Practice has shown that it will be useful to listen to some unprocessed music and speech material before you

start equalizing your sound reinforcement system. If any distortion can be heard, try to eliminate it within the

system. Speaker placement is also of importance. No equalizer can improve a system sound that lacks

transparency due to reflections from walls and ceiling. Often, drastic improvements can be achieved by

modifying speaker placement and alignment.
If you are using an active multi-way system you should take some run-time and phase correction measures

before you work with the ULTRA-GRAPH PRO (the crossover network BEHRINGER SUPER-X PRO CX3400

provides all the necessary tools with its variable split frequencies, phase reverse switches and electronic run-

time correction facility). Interference such as mains hum and narrow-band resonance should be eliminated with

the ULTRA-GRAPH PRO, before you start doing a sound check.
Once this basic setting has been made, you can continue to fine-tune the system by hand.
Please remember:
A linear response curve is not desirable for all kinds of application. For example, intelligibility is more important

in speech applications: here, you should apply a slight roll-off in the bass range, because below the frequency

range of voices there are no wanted frequencies but only interference (rumble, etc.).
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.

You should always take the physical limits of your system into account, no matter which

settings you choose.

Once the system has been adjusted as precisely as possible to produce the desired response curve, you

should walk around the room to get an impression of the sound produced in various places. Remember to

make regular breaks during these listening tests and to play back various music and speech programs, so

that you get a feel for the response characteristics of your system and of the room.

2. APPLICATIONS