DH Labs reseller here, and long time user / builder of their cables. The best results come from terminating the wire directly into connectors WITHOUT soldering them. Connector metal to wire metal in a tight crimp or screw down is all you ever need. Adding solder may affect the electromagnetic properties at the connection points and degrade the sonic quality. If you are worried about oxidation, you can cut off the ends of the wire by half an inch and reterminate them after a few years. It typically takes that long to build up oxidation if they are sealed well.
Building Speaker Cables
I have decided to build my own cables. For the cable I’ve chosen DH Labs T-14 cable for the cable connectors on the speaker side will be Furutech FP-201 (G) spade connectors, amp side will be Furutech FP-200b (G) banana plug connectors. Would it be overkill to silver solder all the terminals before sealing the connections with marine grade shrink tubing?