Dave's Speaker cable uses high end Neotech Ohno Continuous Cast Copper in a Litz braid with a cotton insulation. For the high efficiency Daedalus speakers I would think 14 gauge wire would be plenty for most all and those who use low power SETs might consider the 20g wire. He does offer an 11gauge wire but that seems geared to 200watt plus systems.
Some comments listening to the 14g Dave speaker cable on the Daedalus Ulysses powered by tubes. What strikes immediately on hearing this wire is its squeaky clean, neutral presentation with an impressively extended and detailed top end not typical of wire in this price class. The Daedalus tweeters really shine here.
Now if your are looking to soften up an overly aggressive high end or butter up the midrange some, there are better choices. But if you are aiming your system for precision, inner detail with a purity of tone and full extension, these should definitely make your demo list.