Horn not working on Behringer B215XL passive speaker. Tools used: Long(12") phillips screwdriver, adjustable spanner, magnet pen,multimeter,1.5 v battery short length of wire, hot glue gun, soldering iron, solder, 24volt 75w halogen bulb G6.35 available from music shops or ebay.
Remove the speaker output nuts, and four screws that hold the Speakon connectors on the back.
Remove the 18 screws that hold the case halves together using a long shafted phillips screwdriver. I used a magnet pen to recover the screws from their long tunnels. Note that the two holes have shorter screws, and that the screws underneath the handles
Carefully pry the halves of the case apart and disconnect the four speaker wires. Check the resistance between the tweeter terminals using a multimeter which should approx. 3 - 5 ohms. No resistance = dead tweeter.
Using a 1.5v battery touch the + end to one of the tweeter terminals and briefly run a wire from the other terminal on the speaker to the - ve on the battery. It doesn't matter which way round the battery is for this test. You should hear a click which will indicate that the tweeter is functioning. Don't use any battery with a voltage higher than 1.5v .
Peel back one side the white insulation material away from its glued points, unscrew the four screws and remove the crossover unit The crossover uses a 24 V 75w halogen bulb as a fuse. In my case the bulb was ok but the bulb holder had become detached from the circuit board, which I detected by using the continuity setting on my multimeter. I removed all the glue, unsoldered the connection from the rear of the board, fitted new legs to it and resoldered. I fitted a new bulb and re covered with a generous blob of hot glue to stop it vibrating loose.
Refit the crossover unit, and reconnect the speakers, the terminals are marked +/-. Tweeter + yellow - blue, woofer +red, - black. Now's a good time to connect to a sound source to check all is working. Using a hot glue gun reattach the white insulating material to the inside of the speaker case. Refit the jack nuts and four Speakon connector screws on the rear of the case. Gently replace the front cover and all the screws noting the position of the shorter and thinner screws. Hope this was useful.
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