just as a caution, i had a alpine amp that was similar to this i gave to someone.  they hooked it up to some mids and highs...  it FRIED them instantly.  (it had worked last i knew)  jus sayin, u might want to test this out on speakers u don't give a shit about first before you go installing it up to everything.   
great deal on the freebie though!  good luck!