Behringer EUROLIVE PROFESSIONAL B1220 PRO Manual - Page 7

7 EUROLIVE B2520 PRO/B1800X PRO/B1520 PRO/B1220 PRO User Manual 3.3 PARALLEL Input (B1220 PRO, B1520 PRO and B2520 PRO) The EUROLIVE B1220 PRO, B1520 PRO and B2520 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) PASSIVE BI-AMPING Subwoofer B1800X PRO PINS 1-/1+ PINS 2-/2+ INPUT: Full-range input OUTPUT: highpass output Signal loop Signal loop Subwoofer input Tab. 4.1: Pin assignment 4.1 Subwoofer (PASSIVE) • 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) • 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. 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 • Always try to find the optimal signal level. Try to 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 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. 6. Application Examples 6.1 Full-range stereo operation In the following example, the main stereo output signal of a mixing console is connected to a stereo power amplifier. A B1220 PRO is connected to each of the amp outputs, and these speakers reproduce the entire frequency range (full range). XENYX 1202FX 5. Additional Considerations L R 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, 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 mm2. EUROPOWER EP2000 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. 2 x EUROLIVE PROFESSIONAL B1220 PRO Fig. 6.1:Full-range stereo operation