I replaced the woofers in my pair of the Small Advents with woofers taken from a pair of KLH's (rubber surrounds) that I bought cheap from GoodWill. Worked perfectly fine! So you could do the same! A beat-up pair of AR's or KLH's can yield a nice replacement pair of woofers - with no change in SQ!
Refurbishing 1973 Large Advent speaker
I am refurbishing a pair of large Advent speakers from 1973. The tweeters and cross overs work, but the woofers are garbage replacements. My question is... Is it better to buy a 2nd hand 1975 original woofers and roll the dice on them or buy a pair of new replacements from simply speakers? Say they are the same price... is there enough magic in the originals to warrant the risk?