I don't think lamp cord is a good general recommendation. A cheap wannabe Litz speaker cable (insulated strands) in any random audio-video store likely sounds noticeably better with any speaker capable of resolving treble. Fwiw I am making my mid-treble speaker wires from multiple parallel Cat5 cables (that has been quite common reco in speaker circles for ages already). It sounds better for that application than random bulk wire or the shitty sort of semi-Litz that I use for bass. Bass cable needs to be beefy for firm bass. Here AWG (or cross section area in old world) certainly is relevant for damping. For bass drive I probably couldn't tell the difference in my setup, when the cross section and material is the same. If I had 100k$ TT rig, 150k$ monoblocks and 200k$ speakers then I'd worry about 5k$/m cables. That is just ignorant BS! There is hardly any firm scientific evidence for anything in audio, it doesn't make the phenomena non-existent. Why SET sounds so good? Prove it with math and 5 sigma probability experiments or it doesn't! You kidding? Here's a scientific/engineering reasoning: what's the skin depth in copper cable at 10kHz? About half a mm. Worst case it's about half the usable copper for 14AWG wire at 10kHz. Not end of the world, but it's a measurable difference. It's also worth taking into account inductance, capacitance and conductor and insulator quality. Easily measurable stuff that can be correlated with psycho-acoustic observation.