Re: Yes, it's cliche, yes it's overdiscussed, but yes, I need new subs.
I suspect he's happy with the performance but not the size and weight and is willing to sacrifice a bit of performance for the sake of usability, but only to a certain point and up to a certain cost. I'm at a similar cross roads, but instead of subs that are too heavy, my LA400's underwhelm in the performance department but are relatively easy to move around and 8 of them are worth about what a pair of real subs would cost (if that). My racks and stacks clients are unfortunately the type that wouldn't be happy with two great subs in the place of eight mediocre ones, and a pair of LA400's provide a 6' base which is handy for budget racks and stacks gigs (and with a plinth I can use just two per side and still have a rock solid platform for tops).
My goal is convergence of my SOS and Racks and Stacks to a common subwoofer like the VRX and VP series sub. 8 or 12 and you've got a pretty scaleable system that can do the quick and dirty racks and stacks gigs as well as smaller weddings and corporate stuff for which good quality SOS is sufficient. No, it's not the meanest bad-ass sub system, but it would get a lot of jobs done. From a business standpoint I'd be fixing a problem that doesn't really exist though, as most of my clients are more than happy with what I have at the moment.