how do you get a 14.4v system
usually you don't try to get one. some cars do have a higher charge voltage, but most don't. rangers have 13.8v charging systems give or take.
Most all amp manufactures will fudge the numbers on their amps to appeal to consumers. The higher the wattage number that they can plaster on the amp the more they sell.
Which is why you always see things rated at 2ohms, 14.4+ volts, And the most worthless number of all MAX power. An amp will never put out the max rating (unless its is on fire) RMS power is overrated figure too. On top of that those numbers are derived on test resistance which is much different from the variable resistance of a actual speaker. basically every number is cleverly fudged one way or another.
Power output rating are so skewed these days its important to buy more power then you need.
Thats why buying an amp at double the speakers rated power is a good idea.
Breaking-in is not something that needs to be done.. just run the speakers normally the suspension will naturally loosen up. no need for silly break-in procedures.
Toreador Red 05' FX4
4.0 4x4 A/Tran Ext.Cab Daily Driver. Nomads, BFG M/T's
Alpine 9857, JBL MS-8 DSP, US Acoustics 2x80w & 2x100w, Vifa 1" XT25 Dual Ring Radiator Tweeters 3k+ 24db slope, Dayton Audio 7" RS180-4 Mid-woofers 100Hz-3k 24db slope, 500w rms Kenwood Class-D Mono - JBL 10" GTO1014 Sealed. 100Hz- 12db slope