Trying to Maximize my Bass with My Stock Amp: BMW Z3!

Today, I'm reinstalling my homebrew subwoofer surround and rewiring the sub to try and get better sound. Will it work? Check it out!

What little info I found about the stock amp:
https://www.bimmerforums.com/forum/showthread.php?2473979-1998-Z3-Harman-Kardon-system-amplifer-details-and-design-stuff
file:///C:/Users/coast/Downloads/1998%20BMW%20Z3%20-%20Harmon%20Kardon%20Wiring.pdf

Other option/ way to do this:

My viewer Don's great directions on changing the entire system:
https://docs.google.com/document/d/1jaPmRIQmCfqcIHDaL3NEKep9geo48c1oY6my2zqDvcQ/edit?usp=sharing

Please send me pics and descriptions of your cars for Zed of the Week! Send a few high quality jpegs (landscape/16:9 format) and a brief description (year, engine, transmission, work done, etc.) as well as where you're from (and your name!) to:

momentofzed@gmail.com

Also the address for any other reason to contact me- look forward to hearing from you!

Видео Trying to Maximize my Bass with My Stock Amp: BMW Z3! канала Moment of Zed