A while ago, I collected RCL values for a bunch of speaker cables. Many manufacturers don’t provide them, so mine is a short list.
All the cables had low resistance, < 0.005 ohms/ft.
The highest capacitance were the Goertz MI-2 Velocity (317 pf/ft), Audience Maestro (168 pf/ft), and Kimber 12C (151 pf/ft).
The cables with low capacitance *and* low resistance were the Belden 5000UE and 5T00UP. Both have about 0.15 uH/ft inductance and about 25 pf/ft capacitance. They are available from Blue Jeans Cable for very reasonable prices, and might be worth a try, given you have a long run. With 30 ft, I definitely would want low R, C, and L.
(I am using Kimber 4TC, but the run is only 5 ft. The 4TC runs 41 pf/ft.)
HTH