Yeah, I meant to say 3 in series. As you can see from my post, it was quite late when I posted that. My mind wasn't working quite right
It was a bit of an adventure getting those things to shake. I finally determined two things that fixed my problems:
1. Switching to content in DD rather than streamed stereo MP3s made a big difference.
2. If I am going to grab the LFE signal from the other output of my X-30 crossover, I cannot have the crossover volume turned WaaaaaAAaaaY down. I had to turn that up to max and then go turn the volume at the sub down. That way, my shaker amp was getting the full LFE signal.
Once I did those two things, JetPac Refueled was rocking the theater room
Wow, I can't wait to mount these things to the chairs... hopefully this weekend. I'll be all ready when Forza 2 comes out and in the meantime, I'll be playing all my games and watching movies again just to enjoy the experience