OK yes the bass is in the 6X9 door speakers, At most I cut out below 300 hz if the speakers are 4 ohm. I think they are 8 ohm so only cut out below 150 hz. This is called a crossover it’s used in many speakers. It does not sound like Alexa. Yes I have the factory Kicker sub I installed. I have been an audio engineer for over 40 years. I have designed $250,000 systems for church’s and $10,000 systems for cars not my own. I never spent more than about $2500 on some killer car systems for myself. I actually do know what I am doing. At this point I question that there is a factory Bose sub included with the Current Bose system, at least on my AT4. I believe it is a 6 speakers system not 7. The shitty bass coming from the doors. My system sounds MUCH better than stock Bose. I spent $610 so far. I was not out to build a ridiculous system. Been there done that. I just wanted to fix the factory one, that’s harder and more fun to me. I know there are better subs and speakers, I want my truck to be close to stock for resale.