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EUROLIVE PROFESSIONAL SERIES
5. ADDITIONAL CONSIDERATIONS
3.3 PARALLEL Input
(B1220 PRO and B1520 PRO)
The EUROLIVE B1220 PRO and B1520 PRO loudspeakers
feature two speaker inputs laid out in parallel. You can
alternatively connect one of the connectors to the output on
your power amp and tap into the signal from the amp once again
on the second connector, in order to, for example, feed this
signal into an additional loudspeaker. This way, you can create
stacks consisting of speakers with different impedance values.
+ ATTENTION: Never connect the output signals of
different power amps to both parallel inputs at the
same time. This may permanently damage your
setup.
4. PIN ASSIGNMENT (B1800X PRO)
PINS 1-/1+ PINS 2-/2+
INPUT:
Full-range input
OUTPUT: high-pass
output
Signal loop
Signal loop Subwoofer input
Table 4.1: Pin assignment
4.1 Subwoofer (PASSIVE)
s 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.
4.2 Subwoofer (BI-AMPING)
s Connect the subwoofer signal to PINS 2-/2+.
s PINS 1-/1+ of the input are connected to PINS 1-/1+ of the
output, and can be used to loop the signal through.
s In general, when in BI-AMPING mode, PINS 1-/1+ and PINS
2-/2+ are looped through.
5. ADDITIONAL CONSIDERATIONS
5.1 Length and diameter of loudspeaker cables
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, dont 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
.
5.2 Power amp rating
Selecting the right amp can turn out to be rather difficult.
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.
5.3 Fuses
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.
5.3.1 Protecting your equipment
s Always try to find the optimal signal level. Try to avoid
overdriving your amp.
s Keep in mind the physical limitations of your PA system.
s 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 offer an outstanding solution. All
models can be used as a limiter: the audio signal doesnt
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.