I'm still using my college futon, so the shakers are mounted to it. I was originally using 4 on it, but now I just have two. The two shakers are screwed into a piece of plywood which is attached to the frame of the futon with heavy duty zip ties.
I redid the mounting to be a bit nicer, but I took some pictures of the original setup I had back in the dorms
https://mywebspace.wisc.edu/sp...AURA%20Bass%20Shakers/
Right now I just have two of them presenting an 8-ohm load to one of the channels on the little sherwood receiver.
Originally I was running a regular receiver (HK 325 and then later a Pioneer 1014) with the subwoofer pre-out split. One half would go to the sub and the other would go to the sherwood's phono input. I'm using the phono input because even on maximum volume, the sherwood didn't power the shakers enough based on the level of the LFE signal it was getting from the pre-out of the main receiver.
Eventually I added some fmod low pass filters between the main receiver subwoofer pre-out and the sherwood receiver. That helped me just get the very low frequencies to the shakers. Originally when I was using just an 80Hz crossover for both the subs and the shakers, the shakers were too distracting to me. While watching movies, sometimes they would even come on when some male with a deep voice talked, which wasn't what I was looking for. I just wanted them to give a bit more kick when some explosion happened or something similar. The fmod low pass filters helped a lot with that.
Now my setup is one of the digital outputs of my BA pre-pro goes to a digital coaxial input on the Onkyo. I have the Onkyo set to a 50Hz crossover point. The subwoofer pre-out on the Onkyo then runs to the sherwood's phono input for amplification.
Honestly I probably could get the Onkyo to power the shakers directly, but I believe I decided not to do that because it didn't have a phono input (I'm not at my apartment so I can't check), and I didn't want to crank the volume way up on the Onkyo to compensate for it. It's very easy for me to adjust the sherwood's volume without a remote since I mount it right behind the seating. If I were to use the Onkyo from my rack, I'd need to program another volume control into my remote to change the shaker volume.
I could be more efficient with how I set it up, but it's working now and it does everything I want it to.
As for the difference it makes, I just wanted to mention that I only use them for movies rather than music. When I decided to try bass shakers, I had only read about them and never tried them out. I wasn't quite sure what to expect when I got them, and it took a while to really get them set up the way I wanted. Two essential things to get it right were
1. Easily controllable levels on the bass shaker amplification
2. Control over the frequencies sent to the shakers independent of the subwoofer
I would describe it as getting most of the impact and vibration that I would get from cranking my system up a LOT without having to turn the whole system up that loud. I do like to have my movies fairly loud, but I don't like to have it so loud that my subwoofers are shaking the whole room with every explosion. I have had several points in my home theater experience when I've had a lot of sub for my room dimensions which resulted in easy pressurization. Despite having two 12" SVS subs in my setup now, I still don't feel like I have the ease of pressurization that I had with the 10" SVS in my dorm room. To get the same kind of effect I had then in my much larger area now, I'd really have to get my system cranked up to reference level. With the shakers, I can get that same kind of effect (and then some) independent of my overall system volume.
Due to the shakers being connected to the furniture vs. a subwoofer sitting on the floor, the vibrations are much more directly transferred to the seating and are also more isolated vs. the rest of the room. I'm in an apartment (above a bar, so it's not that big of a deal), but the effect shakers give isn't really transferred to the rest of the room as it would be with subwoofers. That means that I can experience the tactile feeling of movie LFE effects without cranking my system loud enough to have the cops called on me.
I have had some people come over and get freaked out by the shakers. I'm not sure if they'd learn to love them, but I suspect that in general, they're not for everyone. I think that the shakers have been one of the best relatively cheap additions to my system. I think the only downside to having them is that I'm pretty spoiled now. Whenever I go to an action movie in the theater now, I feel so disconnected from the action. Not that I've been in a lot of explosions to know what it feels like, but explosions feel so flat and distant without that tactile rumble to go with them now.