Welcome to the forum!
You're talking about something like
this, correct?
Your MPS 150 cable is carrying the amplified signal to the woofer cone. I believe that the one in the link above would work just fine, given that it has 16AWG cables (and I'm assuming that's 16AWG for both conductors). It's even shielded, which I don't think you'd need.
I'm not 100% positive, though, so hopefully someone else here will chime in.