This project turned out great. I finished the installation on 11-25-2020. I am using sound deadening mat and the full space of the spare tire for my speaker box. Even though the amp was manufactured in 2003, I purchased this year, new in the box. It works. The 12 inch sub was purchased in 2002 at a speaker expo event and has been used in 4 different daily drivers up to September 2020. With it still being in really good condition and it fits the 2000s era of tuners, I choose it for this project.
I went with the Cousic 400se Carbon Fiber edition to go with my CF theme. Lucky I found a new unopened one from eBay! I have it set to use around 75% of max power. This will be plenty of power, because I have always ran a 400 watt amp on this sub for over 15 years. This is my preference.
Audiobuhn AW1200Q sub. 700 watts RMS (350 watts per coil) and peak power 1,400 watts. The amp will be putting about 350 rms watts(150 per coil), which is plenty for me.
Crutchfield article: https://www.crutchfield.com/S-as2vn93eXf6/p_037AW1200Q/Audiobahn-AW1200Q.html
Manual. https://pdf.crutchfieldonline.com/ImageBank/v20050210130700/Manuals/037/037AW1000Q.PDF
Bandpass box that the sub has been in since 2002 can be seen below.
I used gold plated and platinum terminals for all cable ends. Dressed up the wires as needed with old school cabling techniques.
Audiobahn High Definition twisted speaker wire. Classic wire. No longer can be found , but it's great wire.
I dressed up the RCA audio wire with the black/red braided sleeving and black heatsink.