Originally Posted by DonH50
Cables do not generally add anything to the sound by themselves. Sonic changes relate to interaction among power amp, cables, and speakers. In your case I doubt the 7 AWG cable is going to "increase" the bass, but it could provide better bass than the 12 AWG cable for various reasons, thus making the bass seem to stand out more compared to the treble. It is possble the stranded configuration has higher capacitance and thus reduces the treble, but that seems unlikely... What amplifier?
I think a person listening room and how it's configured has a broader impact to "bass" than a cable.