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EUROLIVE PROFESSIONAL SERIES
Application Examples6
Pin Assignment 4.
(B1800X PRO)
Subwoofer B1800X PRO
PINS 1-/1+ PINS 2-/2+
PASSIVE
INPUT: Full-range input
OUTPUT: highpass output
Signal loop
BI-AMPING Signal loop Subwoofer input
Pin assignmentTab. 4.1:
Subwoofer (PASSIVE)4.1
Feed the full-range signal to the input PINS 1-/1+. The high- =
pass signal can be tapped into at the output PINS 1-/1+. PINS
2-/2+ serve as a signal loop through.
Subwoofer (BI-AMPING)4.2
Connect the subwoofer signal to PINS 2-/2+. =
PINS 1-/1+ of the input are connected to PINS 1-/1+ of the =
output, and can be used to loop the signal through.
In general, when in BI-AMPING mode, PINS 1-/1+ and PINS =
2-/2+ are looped through.
Additional Considerations5.
Length and diameter of loudspeaker cables5.1
Loudspeaker cables whose diameter is too small can limit the
power amp performance considerably. The longer the cable, the
greater 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
2.5 - 4.0 mm
2
.
Power amp rating5.2
Selecting the right amp can turn out to be rather difcult. Therefore,
stick to the following rule of thumb: the power rating of your amp
should be roughly twice the speaker load capacity. A speaker rated
at 400 Watts continuous performance can easily be powered by
an amp rated at 800 Watts output power. An optimal addition to
your speaker system would be the BEHRINGER EUROPOWER
EP2500 power amp, for example.
Fuses5.3
We do not recommend the use of fuses with audio applications.
Damage to loudspeakers can be the result of high peak signals
and high output power. However, fuses can only offer protection
from one of these two factors, and never from both. Additionally,
fuse resistors are sometimes nonlinear, leading to distortion and
unpredictable overdriving.
Protecting your equipment5.3.1
Always try to nd the optimal signal level. Try to avoid over- =
driving your amp.
keep in mind the physical limitations of your PA system. =
Use a limiter to restrict the output signal level. Place the limi- =
ter between the mixing console and the power amp. For this
purpose, our proven AUTOCOM PRO-XL MDX1600, COMPO-
SER PRO-XL MDX2600 and MULTICOM PRO-XL MDX4600
compressors offer an outstanding solution. All models can be
used as a limiter: the audio signal doesn’t overdrive any more,
and unpleasant “peaks” are effectively 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.
Application Examples6.
Full-range stereo operation6.1
In the following example, the main stereo output signal of a mixing
console is connected to a stereo power amplier. A B1220 PRO
is connected to each of the amp outputs, and these speakers
reproduce the entire frequency range (full range).
Full-range stereo operationFig. 6.1: