Cables cannot add, only degrade the signal. Tempo Electric makes pure silver cables with WBT Connectors.. don’t fall for the hyperbole. Keep power cords away from them if you can, if your equipment allows for balanced cables you can use those to good effect. Get a good cleaning kit and regularly clean the connections. Ferrite snap on rings on power cords if you have emi/rfi issues.. try the solid basics first before blowing a bunch of cash on snake oil cables.
