Long time since I posted in this thread so I thought you may be interested in an amusing story about my dual Submersive F2s (master and slave).
I am in the process of building a new dedicated HT from scratch. This week we reached the stage where we could 'roadtest' the full 7.2.4 setup, basically just to check everything seems OK. So this test was run with no levels or delays properly set and without Dirac Live's magic EQ running.
Now my Submersives are at the back of the room and, ultimately, they will be behind an acoustically transparent stretch fabric 'wall'. This means that the controls on the plate amp will be difficult to reach once the room is finished. However, Mark had the foresight with the F2s to make arrangements for the plate amp to be on either side of the F2 as well as on the back, simply by removing a blanking plate and installing the amp, then using the blanking plate to fill the hole where the plate amp had been (on the back). So I duly removed the amp and set about re-installing it on the right side of the F2. Due to the nature of the internal bracing on the sub, I couldn't mount the amp the right way up, so I mounted it upside down. I tightened all the numerous screws and that was that. Took about 15 minutes and now the amp is more easily accessible to me.
I did this about 4 weeks ago and then forgot all about it. When we came to do the sound check the other day, I roughly set the Submersive's amp control to about 3 clicks from the bottom, which I figured would be good enough for the job in hand.
We then played the nightclub scene from John Wick. OMG. When the shooting started I thought the building was going to come down. Of course, what had happened was that I had sort of forgotten that the amp was upside down and had set the gain control to 3 clips from the top
. I have never heard my Submersives play like this before! One thing is now for certain: even in a 3,500 cu ft room I ain't ever going to need more than two Submersives!