OK.... here is my "new to shakers" report for eveyone who may still be on the fence about these as I was able to get them hooked up last night and play around....
Simply....AWESOME! I wish I had more thumbs to put up for these!!
I will qualify "awesome" however to only be after proper installation and tweaking per everyones comments here. A few of my observations:
Like has been said here before, and I totally agree now, a seperate receiver to drive the shakers is ESSENTIAL, as otherwise you may wind up with wild amounts of shaking with no way to fine tune via "volume." Even with my weak, 14 year old JVC receiver with a halfway broken volume control I ressurected from the basement (which came off of one of those "mini stereo" setups) the shaking is amazing. I cannot wait to get a better - even halfway decent - receiver so I can have finer adjustment.
Doyle - I did screw mount to the wood frame - Man I dont know what wood it is but it was hard as a brick. I managed to break two drill bits and broke two screw heads off before I could fully seat the screws. Finally I got the right pre-dill hole size and screw size for a rock solid mount - although the skinny width of the board only allowed me to use two opposing mount locations versus all four.
Again I think the seperate control is the seller for these things. I tested many many scenes with these and I found meveral movies that seemed to have varying amounts of LFE levels, requiring me to adjust the "volume" as appropriate for a given movie. I may also add an fmod low pass crossover to keep out some of the "higher" low frequencies.
The weirdest thing is, when the shakers are adjusted "just right" it is next to impossible to localize the shaking - it seemed like the entire house was shaking apart with low bass. Too much and it seems like a gimmick, too little and the scene winds up "missing something." I also tried rewatching most of the scenes with the shakers off and found that I was already spoiled and missing the subtle effect the shakers provide.
Once again this forum comes through with a brilliant suggestion that pays off huge dividends. I cannot wait to test these out on some unexpecting guests.