I believe there will be oxidation on the wire no matter what unless the joint is made air-tight somehow. I had to reterminate the amp end spades on my Cardas Quadlink 5c w/bananas because of my new int. amp's poor binding post design. I will say, Cardas did a very proper job, soldering and then filling in the spaces w/??? In my experience, bare wire sounds the best. I would buy a little extra wire and reterminate every yr. or two. If you were to put a "sleeve" on the wire, I would make sure there was proper contact and I would soldier at the ends. But still oxidation would occur, IMO. BTW, Radio Shack has a really fine locking-style "Gold series" banana plugs. (Cat.#278-307). To recap, spk. end, bare-wire and reterminate as needed. Amp end for convenience, terminate w/ spades or bananas.
Crimping bare speaker cable connections
I have DIY cables in my system. I prefer the bare wire connections vs. spade connections but I don't like the inconvenience of periodic cleaning of corrosion from the wire. I see that there are WBT crimp sleeves availble from www.partsexpress.com. These are to be used as part of their terminal installation. I'm wondering if I crimped one of these sleeves on my bare wire end and placed it through my speaker's binding post, would I solve the periodic corrosion problem? It seems to me it would, but I need to know from those wiser than I. Would it deter the quality of the signal?