Bedienungsanleitung Behringer VP1220 (Seite 5 von 10) (Englisch)

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5 EUROLIVE VP2520/VP1800S/VP1520/VP1220F/VP1220 User Manual

(2) The VP series includes two parallel ¼" TS loudspeaker (2) inputs. You can

connect one of the connectors to the output on your power amp and tap

into the signal from the amp on the second connector, in order, for example,

to feed this signal into an additional loudspeaker.

strain relief clamp

sleeve

tip

sleeve

(ground/shield)

Unbalanced ¼" TS connector

tip

(signal)

Fig. 2.3: ¼" TS loudspeaker connector

◊ When several loudspeakers are wired in parallel the overall impedance

ZT to be handled by the power amp can be calculated, as shown below,

from the individual impedance values of the connected speakers:

For the VP 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 VP 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.

⁄Z

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