Monster Cable m2.4s bi-wire

The big terminator is just a cable splitter.  so high and low wire are identical, 12awg.
You can buy such cable splitter on DIY sites, such as douglasconnections or viablue.
The Monsters are really nice cables!

I have had  the same wires for years.  If you have room try connecting both hi & low wires to the same spade stud.  On my Infinity speakers there is room, but they offer bi-wire studs so that is what I use.  
On the amp side the are crimped together as you know so one stud on the amp of course.  I personally like the thick wire gauge.