Can I Use An Adapter Rated Higher In Current Than My Device Upgrading System In My 2003 Ex-Cab Sierra 1500. Need Suggestions.?

Upgrading system in my 2003 Ex-Cab sierra 1500. Need suggestions.? - can i use an adapter rated higher in current than my device

I wanted to spend no more than $ 300-350. I held a number of components S600A Diamond, because he could not get them for $ 259, but ... I have extra space for a 4-channel amplifier. My device is a current leader Alpine CDE-9846 with the adapter for exchanging data between computer and class II. It is no surprise to awaken my speakers to factory life, but I knew he would eventually have stolen. So I had a series of coaxial cable 91 Kenwood Toyota standard cab, I added doors and speakers are not, and despite the efforts I have music sounds good with little or no distortion. I tried to see what we Crutchfield, although not in the shop does not exist, because they are too high. My doors are 6.5 "and a small tweeter in the factory, sodo not know if you select 6 speakers 4 speakers, or the selection Crutchfield. My rear doors are 4x5 or 4x6 are not sure, but oval. I have an old 160.2 Rockford, was that bridged mono @ 4 ohms 200 watts in my old truck production, I built a box under the seat and back, but it was not recognized until that anything that touches my sister was one of the U-boats stolen. Ok, so we had evaluated two 8ohm Model 2001 SE Rockford subs at 450 RMS Max 250 or something had to give in parallel, are connected to me a load of 4 ohms mono amplifier rated at 4 ohms mono wiring. We must therefore clearly a 12 "4 ohms or some kind of DVC 12" subs, that cable may be hours from my 4-ohm load, to connect to the amplifier. My box onlyPart of the 10 "top to bottom and top DB flipped on my board and I go to a sub 12" so that its more than likely have a flat mounting. I think he still wanted to Rockford, but I'm a penchant for football. I would like suggestions on what brand of sub, and what makes the speakers uninvolved door, my door speakers i just want to use the radio power amplifiers.