@ mants
when the ep2500 was still in circulation, i used them alot on my installations and most of them are still working say 7 years straight now (with just occasional cleaning due to dust accumulation).
the 'ep' series is one good behringer product notwithstanding behringer's high failure rate on most of their models.
i'll be trying the ep4000 on sub duties since it has more 'juice' than the previous ep2500.