Audioquest type 4 & 5 is solid core. Both carry two solid red and black cores for bi-wiring. Audioquest states Type 5 is 15 AWG in total.
Stranded speaker cables remind me of the Monster cables I started with in the 90’s, which are still being sold today, albeit they tout "pure copper" today. But why would I go back to that?
I have found that the larger (lower) AWG is better for Power cords. So I am interested to know why that would make a difference in speaker cable runs? My runs are about 20 feet, and a bigger AWG is important for resistance, but I am curious if you have heard a sonic difference with the use of a bigger AWG in your speaker runs? My speakers are Martin Logan motions and go down to 4 ohms.
In the Audioquest world (and I am not sold on any manufacturer) if I was to upgrade to Type 9, I would still get the same 15 AWG solid core wire but with the dielectric-bias (battery), so Audioquest is in not providing a larger core as you go up their product line. As far as I know, 15 AWG is the most copper found in Audioquest speaker wire line, so I have always just surmised that going with a larger copper core will not enhance the sound.