@robshaw - Take a look at cables from
- Audio envy
- Zavfino
They both have cables in your snack bracket
However, the Pass Labs amp has an exceptional power supply, so you might need one of the higher end products from Zavfino to hear the more subtle nuances that Pass Labs are well known for
Start with cables that employ OCC copper
Also, as @jafant posted - take time to acclimate your ears and break in the amp
- I would estimate 300-400 hours
Regards - Steve