Good question. Good answers. Long story short, decreasing resistance in speaker cable with fatter wire can improve speaker performance… how much it might help is a nuanced consideration that depends on how much current reaches your speakers now and how much capacitance and induction your current cables hold. A couple previous answers work well to bring peace of mind . Well reviewed studio quality cable brands like Canare and Mogami are safe cost-effective universal solutions. My Wharfedale Heritage Lintons love Mogami 3103, a quad arranged cable with two 12 AWG OFC wires and two inert strands to keep the spacing even in the cable.
Will increasing speaker cable AWG make a difference in sound quality?
Increasing speaker cable size (for example w/AQ the cable sizes move up in size from 15AWG to 10AWG) improve sound quality?