You said it was the bottom 2 lines which would be the ZLX-12p or ELX-200 12p, either of those ring a bell? The top 2 lines are EKX and ETX.
I have done college house parties(literally in a house) with nothing but a pair of 12" PA speakers and the cops shut it down on noise complaints.
Most of my DJ events use a pair of these 12's with a one or two 18" subs, but while I have never used a 12" top with dual 18 subs it could be a good combo for some bass heavy genres. Depends on the boxes in question too, some of these 12" tops can get stupid loud so even with some potent subs it's not as crazy a combo as it might seem.
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