For anybody that doesn't know, the factory speakers in the 7th gen celicas are decent quality. If you lowpass your sound at say 200HZ, you can drive quite a bit of power through them with a decent head unit or amp.
The stock deck is just plain sad, once you low pass them & put the wattage to them they sound awesome.
I am not an Audio buff so I have no idea how to go about taking an advantage of my setup.
I have a 2000 GTS. I bypassed the stock amp and ran it to the back onto a Fosgate 800 Punch Amp. How do I go about setting it up like how you stated?