In reply to:
"Using the 4 ohm configuration is always the optimal wiring config. The amp runs cooler, almost idling, produces the highest quality of sound and with plenty of headroom to increase the volume. i.e. A 100W. amp @ 8 ohms produces 100W. However, a 100W. amp with a 4 ohm load increases the total Wattage to approximately 2/3 of the stated wattage power or approximately 166W. of total output power. "
I have to disagree. (to a point) You just can't give a blanket statement that 4ohms is always optimal. This will only happen in a moderate to high-end receiver/amp. Most power supplies in "average" consumer electronics do not have enough current to do what you say. The protection circuits will shut down the fun long before you get anywhere near the 2/3 increase as you claim. See JohnK's first post in this thread.
However, if you are using an amp with high-current capabilites, you will extract more performance with a 4ohm load instead of the 8.
