It really depends upon the condition of each pair of speakers; if the 998's have been treated well, w/o any arcing or flapping noise and can still produce a reasonable amount of output (in stock form they won't play LOUD), you may be able to get some years of use without repairs. The panels, however, will need to be rebuilt at some point. With the Centaur Majors, if the ribbons don't show any signs of rippling along the edges, and do not make uniform buzzing or rattling sounds, they may be a slightly better risk, but again, it all depends upon their condition and hours of use; the ribbon elements will eventually need to be repaired with them, also. I have read some decent user accounts of Marsh electronics, however, I would check to see if they can still be repaired easily. The Quad electronics are generally pretty durable, and can be repaired fairly easily, however, capacitors continue to age even if the units haven't been played; it is kind of a toss up with the amps and pre-amps in this case, in my opinion. With the speakers, both will need a few feet of open space behind them, especially, and will sound best in a medium or slightly larger-sized room. Hopefully this will help.
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