Loudspeaker Wiring and Connectors..
I recommend using AWG #12 stranded all-copper (not “CCA”, meaning copper- clad aluminum*) wire for power amplifier-to-loudspeaker cable runs. An excellent version is available from Belden. Their #8673 is a premium grade AWG 12 duplex primary cable that’s optimum for this use. It has superior insulation, also less tendency to kink than the #12 wire (CCA?) imported by local retailers. Buy Belden #8673 from Allied Wire & Cable: http://www.awcwire.com/mfg/belden/part/8673.
Despite what you hear to the contrary, it is neither necessary nor beneficial to maintain identical linear lengths for the left and right channel wiring runs. Given the speed that electrons travel, there will be no audible phase delay difference if one stereo side has a longer wiring run than the other side, nor will there be any difference in signal amplitude that might theoretically arise from niggling variance in series impedance. Just cut the wire to accommodate your physical requirements.
Do not consider any of the esoteric speaker cable that’s promoted within the hi-end audiophile community. There is nothing that will outperform basic Belden #8673. As noted by Peter Aczel, who founded The Audio Critic: “The transmission of electrical signals through a wire is governed by resistance, inductance, and capacitance (R, L, and C). That’s all, folks! (At least that’s all at audio frequencies. At radio frequencies the geometry of the cable begins to have certain effects.) An audio signal has no idea whether it is passing through expensive or inexpensive RLC. It retains its purity or impurity regardless.”
Assuming that both your power amplifier and your loudspeakers utilize dual banana jack posts (spaced 0.75 inch on-center apart), terminate your wire with compatible dual banana plug connectors. Some nice quality gold-plated dual banana plugs with side entry wire access (desirable), are available from Parts Express...
For red (right channel): http://www.parts-express.com/gold-dual-banana-plug- red--091-332
For black (left channel): http://www.parts-express.com/parts-express-gold-dual- banana-plug-black--091-334
My preference is to shorten the length of these dual banana plugs by discarding their knurled end posts and substituting #8-32 x 0.75 inch flat point set screws. Drive those set screws with a 5/64 inch Allen hex key wrench—or with a 5/64 inch hex bit (more elegant!) from Chapman; refer http://chapmanmfg.com/.
*Most “speaker wire” is now CCA; claims of “pure copper” refer only to the cladding layer.