Connecting Bazooka el8a

Hi fellas,

I am wishing to hook up an older model, self amplified 8" Bazooka (EL8A w/built in 50 watt amplifier) behind the back seat of my crewcab Ford.  I have a couple of questions, bowing to the knowledgeable gurus here!

It is a completely stock stereo, which I believe is 4 ohm wiring.  The manual I've read allows for either low level RCA or high level connection, simply tapping off the rear speakers, I plan to do the latter.  The specs for this Bazooka is 2-ohm.  Is this a problem?  If so, what can I do to correct this mismatch?

Secondly, for power they recommend a direct, fused connection to the battery.  I happen to have an inverter under the backseat that has a hot 8 gauge wire to it.  Can I just tap into that?  I really don't wish to run another wire all the way to one of the batteries again, it's a long way!

Third (and lastly), and since I am so ignorant on all things audio, since the signal to the sub is from the rear speakers, if I cut the bass on the head unit, is that going to negate the bass signal into the sub?  How about if I leave the bass up to all four speakers and run bass blockers? 

I just want to round out my crappy stock stereo sound inexpensively, but I would like to optimize it as much as I can of course.

I thank you in advance, this is an incredibly valuable forum!

Thanks for the reply, Pimp!

Yes, it's just a 400 watt power inverter, very seldom used.  It's on a 40 amp fuse at the battery but I would definitely still fuse the sub too. 

All I know about the stock system is that the speakers are 4 ohm.  I guess it wouldn't matter since the input to the sub is just that, a signal input, it's not driving the sub's power? 

I guess I'll try it out without the bass blockers first, maybe I'll just disconnect the rear speakers entirely, since you can't hear them where they're located anyway?   It wouldn't be a major loss if the fronts get blown up!  lol

Anyone else have an opinion?  Thanks!