You have to compare apples to apples here.
Whether your biwire cabling is two separate sheaths or one sheath with two cables inside, the wire gauge at the amp end is going to be the sum of the wire gauges at the speaker end.
The OP asked if the connection at the amp end was better made to a single output post (per channel), or divided between the two output posts available. Kal's monosyllable was correct IMHO, electrically and sonically.
The best reason to use both posts is convenience and secure connection. If you have two sparate cable runs, they connect to the speakers on two different posts, and the nuts on those posts are easy to screw down tight. When you connect those two wires to a single post on the amp, they may not be easy to tighten and keep tight, especially if the wires are heavy and the connectors are large spades.
If, like me, you have a single, two-in-one biwire cable (a "shotgun" configuration), the two wires are joined together at the amp-end connector. Connecting this to a single binding post is easy.
Whether your biwire cabling is two separate sheaths or one sheath with two cables inside, the wire gauge at the amp end is going to be the sum of the wire gauges at the speaker end.
The OP asked if the connection at the amp end was better made to a single output post (per channel), or divided between the two output posts available. Kal's monosyllable was correct IMHO, electrically and sonically.
The best reason to use both posts is convenience and secure connection. If you have two sparate cable runs, they connect to the speakers on two different posts, and the nuts on those posts are easy to screw down tight. When you connect those two wires to a single post on the amp, they may not be easy to tighten and keep tight, especially if the wires are heavy and the connectors are large spades.
If, like me, you have a single, two-in-one biwire cable (a "shotgun" configuration), the two wires are joined together at the amp-end connector. Connecting this to a single binding post is easy.