I started using 57s in 1964 and was a dealer for Quad for years. I never found them sonically demanding but they present a difficult load for an amp which might be aggravated by using a cable with extreme properities. A friend who still has a pair I sold him in the mid 70s uses reasonably priced quite ordinary cable with very good results. Just steer clear of extreams of capacatance or resistance; that should be covered in papers like the one mentioned above. I used a wide range of cables myself with no problems.
