I have a 08hhr. I want to add a sub amp to me existing factory amp. I want to keep the factory stock amp to power all the speakers but the sub woofer. I want to add a separate amp for just the sub. I ordered a harness for an add on amp. I'm hoping it works, plug & play.. anyone else been in this predicament? I'm hoping it's gonna be that easy when my harness gets here!

 

Hopefully it will be plug and play, which harness did you order , what amp ? And are you changing out the subwoofer ? 🔊

 

to the forums!

This procedure works.
https://www.chevyhhr.net/forums/audi...ium-sys-10944/