Hi Terp, kinda slow here sometimes.
there's a lot of people here that can give you a few really good pointers. best i can come up with is, depending how old the diaphragms in the tweeters are, you could replace them with newer GPA ones. having not heard the 612 cabinets, it would be difficult to have a suggestion as far as a sub goes.
i use a sub with my 828 cabinets. makes a nice difference with them.
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