A single voice coil represents a 8 ohm load while both wired up is 4 ohm correct? Whats the major difference asside from the load and your amp, performance wise? Could i wire up the shiva in a single driver sub with one voice coil to one set of posts and the other coil to another set of posts so i could use a old receiver to power the 8 ohm load? would the 4 ohm load be too much for most receivers or could i just wire them up together in a single set of posts and and drive the 4 ohm load farely safely? Not real sure what the best approach to this would be, thx.