I found a pretty interesting way to improve the low end of the Bose system in my '21 Tahoe. I'm actually a little shocked that I hadn't seen someone try this angle before. I had been looking at the JL Stealthbox, but was having a really hard time separating myself from the $1,200 that they're asking for it. I love JL gear, but that's pretty aggressive for an unpowered sub and box. I did a little searching and realized that AKG has now replaced Bose as the preferred audio provider for the new-gen Escalade. Their stock package includes a 265mm (10.4") sub in the same rear compartment space as the Tahoe sub. I found the part number online and ended up pulling the trigger for $200 shipped from OEMPartsquick.com. I pulled the stock speaker from the box, filled it loosely with Polyfil (this is a standard for all of the boxed I've built) and dropped in a Fosgate Prime R2DS 10" shallow-mount woofer.
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The amp is a Boss Audio Riot R1100M. I understand it's not top of the line, but it has worked perfectly for me on multiple occasions in the past. I downloaded the Stealthbox installation sheet from the JL website, namely because it gives you a step-by-step deconstruction of the panels, seat belts, etc. to get to the sub installation location in the rear of the truck. My new box dropped right in and even used the attachment bolts that were already in place. I added washers and M6x1 nut with a Teflon ring to the top two mounting points for more security.
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I mounted the amp in the storage space in the rear, drilled a hole in the side, added a grommet to keep it neat/clean and wired it up. It was mounted on the right side of the space so that I would still have access to the controls on the side and not have to bend the power and ground wire in a way that would create stress on the connections. I drilled four holes and used two 1" pieces of flat bar with drilled holes to allow the plastic tray to maintain stability underneath and not pull through the plastic when it was tightened. This part was probably overkill, but it made me feel better about it. I tapped in to the rear door speaker wires for the hi/lo converter, plugged in the RCA cables and fired it up. Side note - I don't have ANC, so I was able to get around using an aftermarket harness or an LCi2. True to form, this set up blows doors, y'all. If my wife rolling her eyes means that I was successful, then I pretty much became president of the world after this one. I am beyond happy.
Sorry for being so wordy, but I tried to include everything that I would have asked in this write up. If I missed something or if you have any other questions, let me know. Have a good one!!
Subwoofer enclosure:
https://www.oempartsquick.com/oem-p...UGGYnKpuucxBPFt5Yw49bNduSb7VjdQkaAsK7EALw_wcB
Amplifier:
https://www.amazon.com/Watts-Mosfet-Monoblock-Amplifier-R1100M/dp/B004S4XNEO
Subwoofer:
https://www.amazon.com/gp/product/B005C1R9CE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Converter:
https://www.amazon.com/gp/product/B001EAWS3W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Wiring kit:
https://www.amazon.com/gp/product/B0002VM8RU/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Installation instructions:
https://jlaudio.widen.net/s/v9g9c2qdms/sb_gm_5gsuv_man
