Hello there,
From your question, it sounds like you have had more than one Behringer 15 go faulty on you !!!!!
IF that is the case, then it seems time to turn attention to the Amplifier Perhaps over-driving the Speaker or a crossover component faulty (if it has a crossover unit inside)
The best people to ask are Behringer themselves friend, as they are the ones selling them and would know if there are 'common' failures.
Go here for 'contact us' and knowledge base.
http://www.behringer.com/assets/K3000FX_P0379_M_EN.pdf
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