Another sound system question...help

[944Porsche]

So i bought an alpine 10 in. and i want to believe i have a stock sub because i have the alpine system and sounds like more bass than just speakers can do. I must be bad at searching the web and this forum, but could someone let me know the location of the stock sub and amp(if it has one) haha, feels like a dumb question but please HELP!! Id like to get it hooked up asap

 

[04SCTLS]

Look under the rear deck in the trunk.
Mine had 6 x 9s with a small amp in the middle.
There's a cover you have to remove but it's just a few clips.

 

[944Porsche]

ill check thanks