I’m in the camp that it’s a hobby and it was fun to try. ?Here is my Rube Goldberg low cost stacking method. ?It uses the original base that was reinforced and pipe clamps. ?It was a little tippy at first, and I added a third clamp to the top DQ-10 and a ceiling joist. ?This is my unfinished basement so it was easy to implement. ?Each of the four speaker channels can be time aligned through a 4-CH Mini-DSP. ?However, I believe my stacking accuracy was good enough where it really doesn’t need time alignment.