I'm almost ready to go, receiver (H/K 520) and speakers (S-40, S-20) are unpacked, the missing thing between them is wire. So I'm planning to get to HD tonight and pick up some wire for it. I'm not sure what gauge should I get - the distance is ~5 ft to mains and ~15 ft to rears. Is it 2 wires for one speaker? What kind of terminals do I need for this? Is it just a pair of banana's for each speaker? Do I need to solder them?