I hate to cast dispersions on M, as I"m a super-fan, but my understanding about these older subs is that they are slow and nowhere near state of the art. I would test them provisionally with your 5200s, but my guess is that they won't integrate well with the 5200s much faster performance.

Of course, your ears are what matter.

John

Main system: Cable, Apple TV, HD621, G68D, AC11, 218, DSP7200SE (L+R), DSP3200 (L+R Rear)
2nd system: Cable, Apple TV, MC200, HD621, 568.2, M3100 (L+R)