Time for another FULL LENGTH BUILD EPISODE! Come join the fun as we continue making this extreme subwoofer install come to life! Do you like learning about custom car audio and big sound systems? Subscribe to the EXO channel for all things SPL and BASS! Thanks for watching the video 📺

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Steps Covered In This Vid:
1: Sealing Off B-Pillars
- Keeping the sub box and front cabin fully sealed from the sides and rear helps increase spl. I figure out the curved shape by measuring across every 4 inches, then connecting the dots to trace a perfect taper that matches the B Pillar. Cutting plywood on table saw then using jig saw to finish accurate cuts.

2: Gluing New Panels On Driver Side
-Attaching panel with loctite PL Max so the expanding foam sprayed behind acts as a platform to mount on top. Mounting the wooden piece is very easy due to pressure from being wedged tight. 2 layers thick should be strong enough to prevent bad amounts of flex or unwanted vibration. Adding angle iron to the outside will make it stronger as well.

3: Removing Handle Brackets
- Gutting the rest of the useless parts for added clearance. The two handles stick out far away from the b-pillas making the surfaces uneven and harder screw into. To brace it up properly a flush surface is best for staying flat from top ceiling to bottom floor. Used an oscillating saw to remove the large metal chunks.

4: Filling Up The Passenger Gaps
- Breaking the last segment up into thirds, that way drawing and fitting the gradual curves to the roof don't cause any interference with the factory sliding door track or upper stock braces. Acts as increased bracing and seals the smaller bits that couldn't be customized on piece #2. Used 1/4" nuts & bolts and self tapping screws to secure to vehicle frame.

5: Plotting Important Design Data
- Marking out the key areas where the steel cage and wooden squares to screw into. This will line up all the strongest points that way the hardware bites really hard into the material. This extreme install needs ALL THE STRONG aspects it can get.

6: Cutting Final Sides to Enclosure
- Putting the biggest pieces in, double checking fitment and spacing. These large sections of plywood get screwed against the walls in order to get EXACT measurements for the internal dimension. Maxed out all edges, literally as large as it will go. Need as much rear chamber volume as possible to keep tuning low and displacements not a huge problem.

7: Figuring Out The Wheel Wells
- Because the wheel wheel dimensions are so close to hitting, the existing baffle setup with 8 18s is causing massive issues. IT JUST WON'T FIT!!! Or will it? Makes our subwoofer overlap or baskets get cut, uh oh. Had to troubleshoot like crazy

8: Choosing a Box Design
- Picking the loudest design and the most musical designs don't always match up together. Plans started with a front firing 6th Order with 8 18 inch subs, then slowing transformed into a laid back series tuned 6th with 12 18's. Had to change the plan due to lack of adequate space, little port area, loading issues, and the pain in the butt factor.

9: Explaining New Boxes Design
- Going through all the details of the bigger bandpass enclosure. Showing how to use the quarter wave theory when trying to tune a very large chamber. Illustrating how matching the QWL (quarter wave length) frequency can help with tuning variables within a given target range. Rear ports, front port and cabin size all play roles and affect how well the bandwidth will pressurize throughout.

10: Switching The BAFFLES
- Changing baffle layout to begin building alternative alignment. Marking the hole centers for pilot holes then using a router and circle guide to cut perfectly sized circles. These cutouts will be flush trimmed using a flush trim bit.

11: Layering More BAFFLES
-Stacking more layers atop the template. Will be 5 layer. Had to trace out subs, leaving a buffer zone for the jigsaw to cut larger than exact holes. Wood glue and screws will stick them tightly together. Staggering the seems as the plain is seamed to begin with.

PLUS MUCH MORE!!! 😊

More EXTREME Stereo Installations and Fully Explained Tutorials & How To Videos Coming!

EXOcontralto
Bassheads Unite 2021