Joe,
Day and Night difference between no subs and having subs. I have 2, a F-110 and F-113
I don't know about Rel, but JL Audio has a crossover to manage their subs integrated with your speakers & system. Their tech Randy Weaver is excellent at helping set up for maximum benefit out of the subs. Phone support too. They are in Miramar Fl. if you need service.
I have the Sound Doctor CD to adjust the levels.
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