I've got an empty 2x12 cab. Ideally, I'd like to purchase two 8 ohm speakers, be able to run either a 4 ohm (BF Bandmaster) or 16 ohm head (not sure this exists/unlikely I would use this) into both speakers at once (series or parallel jack), or use only one of them at 8 ohm (probably most likely/common for me). Would a jack/wiring scheme (1st example) like the following allow me to do it, or does this omit the ability to plug into only one of the 8 ohm inputs for an 8 ohm load? Alternatively, is there any way to utilize both speakers with amps requiring 4 & 8 ohm loads? I'm under the impression this is not possible, but it's the solution that would suit me best.