Behringer EUROLIVE PROFESSIONAL B1220 PRO Manual - Page 9

9 EUROLIVE B2520 PRO/B1800X PRO/B1520 PRO/B1220 PRO User Manual 7. Troubleshooting 7.1 No signal when loudspeaker is connected • Make sure that your mixing console is indeed carrying a signal (is the master fader raised? Are channels active?) and that the gain control on your amp is turned up. • When using a crossover, make sure that the relevant channels are active. • Check if the cable connection is interrupted/damaged somewhere in your setup. • To test your configuration, connect another amp. If you now get a signal, the power amp is the culprit. • To test your configuration, connect another speaker. If you now get a signal, the fault lies within the speaker. 7.2 Signal present only on one channel • Make sure that your mixing console is working properly (is the signal present on both outputs (L/R)?). • If using a crossover, check if the relevant channel is active. • Check if the cable connection to the silent channel and to the corresponding speakers is interrupted/damaged somewhere along the path. • Connect the silent loudspeaker onto the amp channel that works properly. If you now get a signal, it is the amp channel that is at fault. If you still can not hear anything, the fault lies either within the loudspeaker or the cables used. 7.3 Signal distorted • Make sure that all signals on the mixing console have been set to optimal levels in order to avoid distortion. • If using a crossover, check if all signals have been set to correct levels. • Make sure that the power amp channels are not overdriving. If so, turn the gain control down a little. However, it could also be the case that your power amp doesn't have enough power headroom, so that the required volume can not be generated without starting to distort. • Make sure that the level of the signal getting into the speakers is not too high, causing distortion. • Check your EQ settings. Excessively increasing the frequencies can result in distortion. • If distortion is still occurring despite everything you have tried to eliminate it, try connecting a different power amp. If you no longer hear distortion, its cause was with the power amp. • As a test, connect another speaker. If you no longer hear distortion, its cause was with the loudspeaker (perhaps a defective loudspeaker). • Check if the cable connection is interrupted/defective somewhere along the path. 7.4 Treble signal too low • Check the EQ settings on your mixing console or on an external EQ, if applicable. • Make sure that the tweeters on your loudspeakers are positioned at the same height as the ears of the people in the audience. If not, please modify the speaker position. • The internal tweeter fuse may have opened. In this case, please contact a BEHRINGER service branch office near you. 7.5 Bass signal too low • Check the EQ settings on your mixing console or on an external EQ, if applicable. • Check the speaker cable pin assignment (see fig. 1.3). Incorrect pin assignment can cause phase cancellation and the frequency incursions related to it. 7.6 Poor sound characteristics • Check the speaker cable pin assignment (see fig. 1.3). Incorrect pin assignment can cause phase cancellation and the frequency incursions related to it. • Check if large objects (e.g. effect racks and similar equipment) are placed in front of the loudspeakers. They too can negatively influence sound dispersion. • Check the sound quality of the input signal by listening to it on a set of headphones. • Also see the instructions in the chapters 7.3, 7.4 and 7.5.