Handleiding Behringer VS1220F (pagina 5 van 9) (Engels)

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5 EUROLIVE VS1520/VS1220F/VS1220 User Manual

For the VS series, here are typical connection scenarios:

• Two 8 Ohm speakers in parallel = 4 Ohms

• Four 8 Ohm speakers in parallel = 2 Ohms

• Two 4 Ohm speakers in parallel = 2 Ohms

• Four 4 Ohm speakers in parallel = 1 Ohm

◊ Your amplifier may be damaged if the actual impedance drops below

its input impedance. Please make sure that the calculated total

impedance ZT is not smaller than the minimum impedance specified

for your amplifier.

3. Optimal Operation

We have developed the VS series for use in a wide range of possible applications.

Of course, the sound of your loudspeakers depends on the acoustic characteristics

of the room/space in which they are being used. The following chapters of

this manual will give you information about getting the most out of your

EUROLIVE loudspeakers.

3.1 Loudspeaker placement

Here are some tips to get optimal sound and performance from

your loudspeaker(s):

• Elevate the loudspeaker at or above head level. High frequencies are

the segment of the audio spectrum responsible for clarity and speech

intelligibility. They can get mued by the front row of the audience,

so we recommend positioning your loudspeakers so the high-frequency

drivers are slightly above the height of the audience. The more you can get

everyone in direct earshot, the better. Imagine the loudspeaker is a giant

ashlight, and you want to illuminate everyone in the room

• Avoid placing full-range loudspeakers in a corner or right next to a wall.

This enhances the low frequencies and can cause the sound to get muddy.

Subwoofers may be placed almost anywhere since low frequencies are not

highly directional

• Make sure that the loudspeakers are not in a place where they could

be knocked over by dancing audience members, overly eccentric stage

performers, sudden earthquakes, etc.

• Some rooms, such as gymnasiums and auditoriums, create a large amount

of natural reverb, making it dicult to maintain intelligible sound.

Laying carpet or rugs on the ground and curtains across windows or

brick walls will help dampen the reections and improve the overall sound

3.2 How to prevent feedback

Always place the “front of house” speakers ahead of the microphones

(from the audience’s perspective), and never behind. Use professional oor

monitors or an in-ear monitoring system to allow the stage performers to hear.

3.3 How to avoid feedback when working with

record players (DJ Applications)

In applications with record players, bass feedback can occur. Bass feedback

occurs when low frequencies get back to the pickup and are reproduced on the

loudspeakers. The most common causes for this are: speakers located too closely

to the record player, a room with a wooden oor, or presence of a podium or a

platform. In such cases, it is best to move the loudspeakers away from the record

player and remove them from the stage, so that they are located on rm ground.

Another option is to use raised stands, which prevent the loudspeakers from

having a direct contact with the ground.

3.4 Loudspeaker protection by using a

low-cut lter

Try to prevent damage to your loudspeakers caused by extreme oscillation

of the low-frequency driver due to subsonic noise and extremely deep

frequencies. Use an equalizer to cut o those frequencies that fall below

your loudspeakers’ frequency range, or use a low-cut/high-pass lter.

Most equalizers and sound-improvement systems oer a low-cut function,

like the BEHRINGER ULTRAGRAPH DIGITAL DEQ1024, for example. Using a low-cut

lter in your signal path is particularly recommended if you use record players

or CD players as your signal source. CD players often produce extremely deep

frequencies, which can lead to extreme excursions of the low-frequency driver.

4. Additional Considerations

4.1 Length and diameter of loudspeaker cables

Loudspeaker cables whose diameter is too small can considerably limit the

power amp performance. The longer the cable, the more pronounced the

problem. As a result, musicians often simply “turn up” the amp, which can lead

to loudspeaker damage. Therefore, don’t use cables longer than 15 m (45 ft.).

For most applications, this will not be necessary. Cable diameter should be at

least 14 - 12 gauge.

4.2 Power amp rating

Selecting the right amp can turn out to be rather dicult. Therefore, stick to

the following rule of thumb: the power rating of your amp should be roughly

twice the loudspeaker load capacity. A loudspeaker rated at 200 Watts

continuous performance can easily be powered by an amp rated at 400 Watts

output power. An optimal addition to your speaker system would be the

BEHRINGER EUROPOWER EP2000 power amp, for example.

4.3 Fuses

We do not recommend the use of fuses with loudspeaker applications. Damage to

loudspeakers can be the result of high peak signals and high output power.

However, fuses can only oer protection from one of these two factors, and never

from both. Additionally, fuse resistances are sometimes nonlinear, leading to

distortion and unpredictable overdriving.

4.4 Protecting your equipment

• Always try to nd the optimal signal level. Avoid overdriving your amp

• Keep in mind the physical limitations of your PA system

• Use a limiter to restrict the output signal level. Place the limiter

between the mixing console and the power amp. For this purpose,

our proven AUTOCOM PRO-XL MDX1600, COMPOSER PRO-XL MDX2600 and

MULTICOM PRO-XL MDX4600 compressors oer an outstanding solution.

All models can be used as a limiter: the audio signal doesn’t overdrive any

more, and unpleasant “peaks” are eectively avoided

◊ Our ULTRADRIVE PRO DCX2496 and SUPER-X CX3400/CX2310 crossovers

are particularly well-suited for protecting your equipment: for each

output, they have independent limiters.

Behringer VS1220F Handleiding

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