For the most part.....yes. They are assuming that another brands "12awg" wire is actually equivalent to "16awg" wire, and that another brands "4awg" wire is actually equivalent to "8awg" wire, which is more than likely not going to be the case unless you bought flea market brand wire. That said....yes, there is going to be some voltage drop across the wire. Most wire gauge charts that recommend X gauge wire for Y amplifier power is making that recommendation based on expected voltage drop for a given length of wire. The goal is to have less than .5V of voltage drop across the wire. Having greater than .5V drop is generally considered to be unacceptable. BCAE1 has a calculator HERE for speaker wire. Nice... Appreciate that link... .. Cookie for you sir!