taxcan

I was recently advised that a good way to bi-wire my RF3 and RC3 was to use two different size gauge wires. The suggestion given by an audio store rep was to use a lower gauge (say 12) for the bottom connections and a higher gauge (say 16) for the top connections on the speakers. This setup is suppose to enhance the hi's and Lo's which will improve sound quality. Has anyone heard of this? Is there any risk to the speakers in this type of setup?

I recently purchased the Denon 3801 receiver along with Klipsch Reference speakers RF3-RC3-RS-3and KSW12 sub. The receiver allows for sixth and seventh rear speakers. What type of speakers should I be considering if any.