I getting a kicker kx800.4. The specs say 4x100watt at 4 ohm and 4x200 at 2 ohm which brings me to my question. From what I understand an ohm is a measurement of resistance so that would be determined by the wire I used (please let me know if this assumption is correct). Is it better to give each of my speakers their own channel at 100 and get another amp for my sub or can I wire 2 speakers together at 200 (100 each) and then bridge the remaining 2 channels for my sub?
the load is determined by the impedance of the speakers wired to each channel, and how they are wired if you have more than one speaker per channel.
if you have one sub, and one set of components, you can wire the front pair of amp channels to the components for mids/highs, and bridge the rear two channels together as long as the sub you connect to teh bridged channels presents a 4 Ohm load, and no lower.