i had a Alpine CDA 7864(with 2 preout) on my car, and i had brought a pair of pionner 8" from my friend also come with a 4X25W sony amp, but doesn't have a Low or High Pass on it. Should i get a new 2 ch amp with low P on it? And, If i want to install my Amp, how do i install it to my 94, MX6. do i need to open any hole for the power cable go though? and which Cable should i hook up first, because i don't know anything about the install? someone please show me how to install a Amp for my 2 8" pionner sub.