I had this old Velodyne ULD-18 cabinet in storage and I brought it back to life! I added 4 internal braces, spayed auto undercoating on the inside, added some foam to the sides along with the insulation that was in the cabinet, added new Dayton Audio BPA-38G binding post, 10 gauge wire and a Dayton Audio HO-18” driver powered by a Dayton Audio SA-1000 amp.
The cabinet is 6.3 interior cubic feet sealed and it sounds bleeping great! I hear low notes and tones I have never heard before, even at very low volume! The amp has a nice parametric EQ that you can fine tune, a very nice feature I did not have with my previous sub amp.
I am very happy with this sub-woofer set up, and it looks pretty good too!



