I run my ESL's exactly the same way: 50 cm cables from mono blocks.
Based on my experience, I suspect that over such a short distance any differences are purely theoretical and inaudible.
That said, Litz wire (many small, independently insulated strands) gives better high frequency response. In theory.
Also, according to the Maxwell Equations, capacitance attenuates high frequencies at line levels, while inductance is the problem at power levels. That means two ribbons in very close proximity to maximize capacitance and minimize inductance. Goertz speaker cable is a good exemplar.
But I don't think you'll hear any difference at all. Good luck!
Based on my experience, I suspect that over such a short distance any differences are purely theoretical and inaudible.
That said, Litz wire (many small, independently insulated strands) gives better high frequency response. In theory.
Also, according to the Maxwell Equations, capacitance attenuates high frequencies at line levels, while inductance is the problem at power levels. That means two ribbons in very close proximity to maximize capacitance and minimize inductance. Goertz speaker cable is a good exemplar.
But I don't think you'll hear any difference at all. Good luck!