I'm looking to add an amp and a sub to my stock system in my 99 ES300. What I'm wondering is if I need to use a line output converter to connect to the stock speakers or if I can just connect the loc to the stock sub output?

Any solutions?

I will be using a 500W Alpine amp and a 10" Alpine Type-R. Any help is much appreciated.

 

I think you can use the LOC and tap it off the output in the trunk. after all its the same signal from of the amp vs/at the speaker terminals. whey create more work?

 

So I just picked up the stuff today and tried to hook it up, but I could not find a way to get the power wire for the amp through the firewall to connect to the battery.

Any help?

I couldn't find a hole in the firewall or the engine bay to snake the power wire through.

 

try around the rubber boot of the steering columm then once u run the wire thru u can use silicone to seal the hole around the power cable then just either run it thru the side of the doors sills or if u really wanna do it right run it thru the middle of the car under the rug to the trunk