Will increasing speaker cable AWG make a difference in sound quality?

If you have a speaker that drops down to 2.5 ohms, with an 8 foot speaker cable, going from 18awg to 10awg will increase the level, at that impedance valley, 0.3db, and the damping will go from 24 to 150. Audible? Maybe.  If your speaker only drops to 4 ohms, those numbers are 0.2db and 40 to 250. Audible? Probably not. Those impedance valleys almost always happen at bass frequencies. This is a change from 18awg to 10awg, so a pretty severe change. Small gauge changes will have smaller differences.

How many watts or amps you are pushing out it not the relevant metric. The lowest impedance of your speaker is, though lower impedance means more amps at the same voltage.

Sasho...Zavfinos do offer refinement in low end.I wouldnt use them if they didnt.Cant see you not happy with them.As posted mogamis might have slightly more as they are a 8awg wire apposed to 9awg occ.More bass doesnt make for a better cable? imho...These are my results in my system i have found and did.

Also as posted the difference is the zavfinos offer a more polished broader spectrum vs nutralish/mogami 3104.You cant get away from the price difference as the mogami is a cheaper offering.As posted...i ended up with the zavfinos for a reason and am quite content with them.

Never heard of Zavfino before today, and I see many mentioning it. A company with USA in their name, apparently based out of little farmhouse in the middle of no where in Canada, and made somewhere in the world. Definitely leveraging the power of the internet and outsourcing.

New idea measuring speaker cable by AWG.  Just buy some fairly heavy cable and stop obsessing.  If it really mattered you would move your amps and speakers so they could be directly connected/hard wired.  For instance, if I turned my monoblocs around they would connect to the speaker terminals with six inches of wire.  But that's not good, most of us think speakers need to see some capacitance/inductance load and three or four feet of cable.

Or if you're the obsessive type spend $00000s on some smart arse speaker cable as long as you can afford to pay for.

The longer the run the higher the gauge generally. I have settled on Audioquest Type-4. It seemingly does not add or subtract from the music, and it is relatively affordable. Yeah, would I like to get my hands on a run or two of Auditorium 23’s? Certainly, but the prices keep going up up up....they are also not readily available, well even the Type-4’s are getting tough to find. Audio Advisor, seemingly one of the only places that will still sell you custom terminated runs are temporarily out of stock. The good thing about cables is you generally only buy it once. I run two pairs of the Type-4 for bi-wiring.