If your wires are somewhat hidden in a cabinet or out of sight, why not use some electrical wire nuts. They are used all the time in house wiring. If you want to solder the connections later on, that is always an option.

The Rat. M80s, VP-150, QS8s, SVS PC 20-39+, OPPO, Onkyo 703s, Harmony 880 Sony 60" SXRD HDTV