Soldering is not advised; read the Audioquest White Paper regarding cold crimp connections. You can order their high-grade silver-plated soft-copper lugs (in whatever size you need) very inexpensively. However a low budget hand crimper will not give you nearly the compression as what Audioquest (or any real pro quality crimper) can do for you. Those who are mocking the quality of a home-brew crimp are barking up the wrong tree, if they think that hand tightening on a bare wire is any better. And if you plan to change ends occasionally, is definitely not the best approach, but it will work. Midnight is just too good a cable to compromise (unless you're pinching pennies) but cost savings is an insignificant issue, considering the price of your wire, etc.
Speaker cable termination
I have a pair of old Audioquest Midnight 2 speaker cables and I need to change the termination from banana plugs to spade lugs. Could anyone recommend where to purchase the spades ? Would the quality of spades make an audible difference ? Can I solder it myself easily ? Is it worthwhile to send it back to Audioquest for re-termination ? Thanks.