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Luni, you just confused the unholy crap out of me.
What I think you were referring to is the fact that when a 2 channel amp is run bridged mono, it "sees" 1/2 the resistance presented it, because the amplifier outputs are essentially paralelled internaly. I did mention this, but not in detail.
As to the whole power draw thing, please see the post on low voltage/dimming lights.... If your system killed your alternator, a cap wouldn't have solved the problem. Whatever impedence the amp was run to has little to do with this - if you're drawing too much current, you're drawing too much current. What I mean is, to produce a given wattage into a given impedence at a given voltage, you're gonna pull the same current - one amp may need a 1-ohm load to do it, another may put the power into 2 or even 4, but in the end, the same current is pulled from the system. The JL's are NOT an exeption to this! They have three different voltage rails in the output section, and switch between them according to impedence to keep output reletively equal. So they always pull about the same current - the lower the impedence, the higher the rail voltage.
Most monoblock amps - that is, amps that are built as single channel designs, rather than multi-channels that can be combined - are designed to perform into 2-ohm loads specificly.
Bnc - Go with a monoblock amp, run the subs in parallel for a two ohm nominal impedence.
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