

these photos from a russian auction site!
notice the blue plug in on the back. i think its called IP bus. what exactly can i use that for? i understand it has something to do with ipods and maybe gps. perhaps laptops too?
the stereo is 4x50w i also have a 100w amp and a loaner 375w amp
i was just about to replace the stock speaker when i discovered only the rear are stock and the front are pioneers like the stereo.
i bought some cheap 50w 5 1/4" speakers for the rear, but considering i have a couple of amps perhaps i should go bigger? the loaner amp came with huge alpine bass bin. im going to mexico and i dont wanna bring that, so perhaps the 375w amp is overkill.
suggestions? recommendations?