20 years is a very long time quite impressive. The amp at the least probably needs to be recapped that could solve the problem. You may also want to get it generally reconditioned if REL offers that sort of service.
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Ive owned REL since their basic entry into the US market,although the stadium wasnt my fav in their line up at the time.Of course it depends on repair cost but their newer subs far surpass the 90s lineup..other makers out there which in my mind are better than what you currently have as well,so see what it cost then weigh your options.