Quick stereo question

I ran a search but couldnt find any answers to my question. I have a 94GT with the base (non-mach) stereo. I am wiring up my own stereo with my own 4 channel amp to power the speakers. My question to you guys is, where are the stock amplifiers located? If there are any. It seems all of the info I can find is regarding the mach sound system. Any help you can give me would be great. Thanks very much.
 
The base Mustang sound system did not have an amp. Premium Sound and the Mach 460 had an amp, located below the radio. If you don't have a gray box below the radio, no amp for you. :)