It would be worth sending an email to shunyata research first to determine the cost. If you ever decide to sell them, factory termination will get you more $$.
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I agree factory termination is the only good way to make short cables out of larger ones. Some companies are happy to do this. Some are not so helpful.
Some types of RCA are a P.I.T.A. to assemble and solder properly. So if you have no experience making interconnects, i suggest you have someone else do the work.