How to make Down Firing Powered Subwoofer - DIY Build

Here's the timeline to guide you in building this DIY down firing active subwoofer. 00:00 - JBL Stage 810 Subwoofer Owner's Manual. Data for such thiele-small parameters, enclosure size, port length, etc. 00:10 - My preferred subwoofer enclosure designing software is Box-Port Design II. You can download it in this link https://box-port-design.software.info... Available only for PC (Windows). 00:22 - Layout, design and dimensions of the down firing subwoofer enclosure using web application Tinkercad. Get it at this link https://www.tinkercad.com/things/8thb... 00:32 - Cutting MDF board main panels using DIY table saw. 00:43 - Gluing the main panels together. Top and bottome panels. Sealing the enclosure using the same wood glue. 00:57 - Cutting the subwoofer hole using palm router and a DIY circle cutting jig made of acrylic plastic. 01:24 - Flush mount the subwoofer speaker using a rabbeting router bit. 01:45 - Cutting MDF board for front, back and middle panels. 02:04 - Cutting the port tube hole on front panel. 02:13 - Cutting the amplifier board plate panel. 02:33 - Flush mount the amplifier board plate by cutting the MDF panel using rabbeting bit again. 02:48 - CheeChong the French Bulldog is helping! LOL 03:13 - BLOOPER! :) 03:25 - Gluing down middle, front, and back panels. 04:05 - Be sure to wipe down dirt and dust using a damp cloth. Wetting the MDF panel a bit will cause it to swell, ensuring the tight bond between panels and glue. 04:22 - Roundover router bit. Rounding the subwoofer box edges for a smooth look and feel. 04:40 - Sanding by an 80 grit sandpaper on a finishing or orbital sander. 04:47 - Painting lacquer primer surfacer paint by brush. Then sand it again with 120 grit sandpaper by hand. 04:56 - Lining the subwoofer internal walls with a poly-fiber material before painting the box with premium house acrylic latex paint. 05:35 - Here's comes the favorite part: Assembly. First by screwing down rubber feet. 06:00 - Bolt down the AIRS PW-280 amplifier board with 4mm Allen Hex bolts and T nuts. 06:38 - Glue down port tube. And stick the subwoofer rubber seal that is included in the JBL Stage 810 box. 07:28 - Solder speaker wires and bolt down with 4mm Allen Hex bolts and T-nuts as well. 07:50 - Voila! Final product showcase. 08:40 - Plugging it in and testing. Track is    • The Ultimate Bass/Subwoofer Tester HD 720P   by Sandeep Luthra