Added Subwoofer, not getting the results expected

[Doubeleive]

Bro, you are off base and the video worked fine, sound quality is fine (after reversing polarity). The only issue is that of the original post, not seeing the output voltage that should be there for a 650W Amp going into a 2Ohm load. What I am gathering here is that it may have to do with DSP pulling bass levels to protect the speakers.

I think you need to understand not everyone is trying to install a competition sound system. I had a 10year old amp, box, and sub sitting around. Just want a little punch added to the factory system (that many others felt was impressive before) for S and Gs. The real issue here is the voltages and how that plays into power output. You went from there into insulting a video, making false claims (it doesn't sound like AM Radio) and talking about buying $150 or $400 items... for what?!?!?! never once mentioned how that would help voltage.

When I get time to investigate the voltages at the rear, pre-amp, I will report back what they look like and if I choose to move my tap, I will report how it affected the output voltages.

trust me if you go spend $70 on a LC2i or even better a LC2i-pro and throw away that rca adapter you will go wow!
that alone will make a sh*t ton of difference, especially if you tap the sub output from the bose amp instead of a door speaker output
not saying go build a competition system, just adding a sub with the proper bass restoration makes it sound a lot better.

it has nothing to do with your amp and ohm load, nor voltage unless you chose to use some small gauge wire (it is 100% the input signal)

the stock amp just filters so much of the signal out that using a rca line adapter is pointless.

if you don't believe me go ask any half way decent audio shop

the bass signal needs to be boosted/restored, there is no other solution no matter where you "tap" into it