interconnect suggestions

I've got my system pretty dialed (for me).  Tekton Electron SE speakers, LTA MZ2 pre and Pass XA30.5.  I'm loving the sound.  There's one area that I've kind of neglected because I have been baffled by the options and prices.  Yes, you guessed it.  Interconnects!  I currently am using four foot Belden cables from Blue Jeans cable between the amp and pre.  I reconfigured my system and now I can run much shorter cables.  Should I invest in different cables?  How much should I spend?  How much of a difference will they really make?  I'm not really that interested in using cables as expensive tone control.  I just want to maximize the quality of the sound of my system.  Thanks for your suggestions!