I am currently using the Bi-wire sound of heaven speaker cable with JMR jumper whick sound great and it is important that it is not expensive. the high tone is very open . My tube amp is monoblock with 150W each side.
I bought my JMR jumper from Simon with special White gold connector which can help release more high frequency to overcome the weakness of the ATC but it is not cheap. The JMR jumper is much more detail and airy then my another jumper VDH. The sound is much more neutral and relax not the same as VDH. The first time I use the jumper I feel the mid range is much more thinner than before but after warm up of the cable I feel the mid range is much more detail. May be I get used to the sound character so it is more subjective.