This model is the downfiring model and I have 2 of them. I may be moving my movie room to a different location and it's going to be tight. I have heard of stacking subs that are rear or front firing but anyone stack downward firing subs and if so any recommendations on how and what to do?
You can definitely stack them. However, note that the feet are there to elevate the sub to a sufficient height so the low frequency waves can move through properly. I recommend maybe placing some rubber furniture coasters under the feet to protect the sub on the bottom a bit more from the feet digging into it. If you're worried about the finish of the sub on the bottom, then maybe cut up a microfiber cloth to put under the coasters.