How to Make L-Port Plywood Subwoofer Box - DIY

A very simple car subwoofer enclosure made of Marine plywood and with a bit of aged antique style finish.

TinkerCad layout and design file - tinkercad.com/things/aKrLqQItnQJ

00:00 - Unboxing the Massive GTX 122 subwoofer
00:40 - Woodworking begins by cutting the plywood sheet to size using a table saw.
01:10 - Drill pocket holes on the panels using a cheap pocket hole jig.
01:30 - Glue all the panels together. Then screw through the pocket holes for added strength.
02:00 - Cut several corner braces by tilting the table saw blade to 45 degrees.
05:10 - Glue and screw front baffle together with the port walls into the assembly.
05:15 - Then cover the box by gluing the last panel. This will be the underside of the box so all the screws here are not visible.
05:35 - Countersink every screw holes for a seamless and smooth box build.
06:15 - Use a chamfering router bit to roundover all the edges of the box to produce a smooth look and feel of the enclosure.
06:30 - Use the same roundover bit to chamfer the edges of the L-port opening. Doing so will make the air flow smoother and prevents air chuffing.
07:00 - Preview of the box after being sanded and stained with a penetrating wood stain.
07:10 - Time to coat some polyurethane wood varnish!
08:00 - All electrical wiring works and final subwoofer assembly.
08:20 - Wiring the sub voice coils into parallel to achieve 1 Ohm final DC impedance.
08:35 - Jump to this part to watch how to properly drive and install T-nuts and machine bolts.
09:10 - Tighten down all Allen head machine bolts using an impact driver. Be careful not to gouge and tear the rubber seal surround of the speaker.
10:10 - Finally, test and verify the subwoofer enclosure's actual impedance and tuning by using Dayton Audio DATS v3.
10:30 - Actual box tuning is 32.64Hz at 1.285 Ohms impedance. Estimated enclosure bandwidth is 24.22Hz to 52.15Hz

And that's a wrap! I hope you all enjoy this new episode of DIY car subwoofer box making. Please let me know what you think of this build by commenting and I hope to see you very soon on the next video. Thank you all very much!