When I had my 2 12" subs installed they went no where near my stock radio or amp so I assuming no bypass needed. Don't quote me on that though. I know they routed the power, the negative and tapped into existing rear speaker lines/wires but they never went behind my dash radio. The sound that comes from SOULange is head turning and crystal clear. I barely ever raise my bass level above -5. I have a bridgable 2 channel 900 watt Pioneer powering my subs which have 1000 watt max output each. Wish I could give you more info but I'll leave you with this. These new vehicles are very timid, tricky and sensitive. Pay the money to have a professional installer do it. It will be worth it in the end. My installer is always honest with me. He even told me not to upgrade the stock amp because the stock radio is better off with it. He stated once you start messing with the stock systems and adding things that directly hook up to them that's when you have problems. That's why my amp and subs are not attached to the stock radio and amp. Good luck.Trying to add bass into my soul base model and keeping tje original radio.. Does the loc need to be hooked from behind the stereo? ! (Bypass factory amp) ... Or does the base models not have this feature. .soo frustrated its not working! !!
This is what I was told: If the radio does not have "Infinity" on the front plate, there is no take off for the external amp on it. That means that if you want to add an external amp (for a base unit) you would have to either jury rig a fix into the existing speaker wiring or you would have to replace the radio. Since the only cars with the "Infinity" are the ones with the HD radio set up and A FEW other SE models and (with no rhyme or reason) a few Exclaim models, you probably do not have that unit. My best advice is to do what Mr. Soulange suggested and go to a pro and find out what your options are.