Edit: ^^ just seen your post. I only have washing up liquid that seems to be working so, so It's going to take a few days to get this crap off my fingers. 
This is how I had it before and it seemed all to directional.
I'll take another picture of the seat bucket that I filled with foam in short while. I have to cut away some foam as I can feel it underneath me its not a problem, it would cut away easily to shape it evenly. I think I've leaned a few things One use the gloves provided  and less is more as the foam expands! Trail and error.
That feels better the seat when sitting down. Cutting foam is like slicing bread, Easy!
Seems like I'm cutting away more than I needed and like I said...trail and error.
Sooty looks with curiosity and no he is not going to be playing with foam slices!
Well its good I have some sine wave tones to play to locate problems that need correcting.
I'm only using a Denon CD sound check disc at present. I haven't connected up the laptop to generate the tones from REW or TrueRTA as of yet just checking it quickly.
32Hz it vibrates I can just about hear the tone as mild humming. If turned up a bit higher and its not even at full level output from the amp driving it. It then starts to produce sound that needs correcting. The transducer is banging I know what it is! I think foam being expanded under near the base of it, is what is producing the bang of the mechanising inside The Puck.
Its not a big deal to try and solve this but as long as the vibration is uniform at least I know The Puck is radiating though the foam so that tells me something at least.
Moving up to 62Hz the level can be raised higher as the device not moving as slower its going a bit faster so, okay then its telling me something I could if I had another outboard PEQ to adjust but as of now I don't.
125Hz same level that I played 62Hz, its so audible with buzzing so not too good but it feels like a mild tingle of low voltage battery on the tip of the tongue I can feel it in the armrests, maybe I should by the Laserdisc "Shocker"! 
http://www.lddb.com/laserdisc/00791/40931/Shocker-(1989)
It is a bit distracting and so some of you know all other channels are muted so I'm only monitoring The Puck! This way it helps to eliminate? Eliminate now when that word comes up I'm thinking of Death Becomes Her. "You have to completely eliminate her".
So anyway where was I? Yes I have to filter out these little snags and I'm guessing maybe the foam is good in some ways and not so good in others. Trail and error. I was thinking a while back to cutting MDF to fit the seat bucket and place a 70mm hole in the centre of the MDF and screw down The Puck the MDF would be placed so its a tight fit around the edges of the inside of the bucket to send out vibrations...
Now playing the same 125Hz over the centre channel that is a few meters away and would need ether a baffle wall rebuilt around the stage to give a little bass reinforcement, but at present I would have to turn it up so damn high to notice the feel of the tone.
Now I turn up the level on the mixer that is feed with LCR signals, I turn up the level gently until I notice the feel in the seat.
62Hz a little resonate noise from the front and I need to tighten up the stage and isolate the speakers with some soft foam padding to reduce the vibration into the wooden stage and returning back to speaker where I hear resonate.
I've placed a blanket underneath the centre channel but it only reduces some noise not all of it so, I have to place some soft foam on the shopping list and make a diy isolating board with MDF foam and carpet tiles cut to size.
Going back down to 32Hz its okay only I have to suss out how to reduce the banging sound if I can only send in one of those mini subs like in Fantastic Journey so they can uses lasers to slice away underneath The Puck I bet it would be so cool.  That is one film I like to buy for its scope as its always been panned and scanned on TV.
http://www.lddb.com/laserdisc/00840/100 ... yage-(1966)
They can slice away a few pieces of foam to allow the base end of The Puck to move a bit more freely without having something in the way.
So for now I'll keep it as it is and try and learn more about as The Puck can give quiver vibration even at 20Hz or pushing it even at 16Hz but needs to be done gently.
When Zane notices a vibration at chapter 11, 4m.39s and then places his hand on the metal fence poles in front of him, even thou we can't do the same thing not even with 3-D and very unlikely Dolby Atoms as there is no physical metal poles in front that we can place our hands onto.
I can feel it in the seat base and the armrest but the shimmering is not like the real thing when placing your hand on pole. Vibrations would be sent though the hand, up the arm and into the body, plus he'd be feeling it also in his feet, up his legs and into the rest of his body.
Now if he was suspended by wires he'd feel nothing! Expect maybe when placing his hand on the metal fence pole.
At least I can feel it and notice a little more of what is there on the soundtrack over conventional TV that would only be heard and you'd have to place your hands on the TV just to feel any sort of vibration within its limited frequency response.
I really find it hard to stay focused on things and the floor is not even finished and if it was I would fit a few The Puck's into it so I can feel vibrations underneath my feet and up into my legs, just like when I travel on the bus I feel a lot of vibration and shaking.
I know!! If I had an L shaped cutting tool I could poke it though the foam and with tight handle turn it gently to slice away any foam that is directly underneath the base of The Puck.
Other option open to me is to suspend it when I pump in the foam suspend The Puck with wires attached to the armrests and wait until it dries off hard.
Or pump it in and then cut a hole out like, rein-o suggested to me as long as The Puck is placed in tightly and I can always spray a gentle amount around the top of it to make sure its securely placed.
Chapter 12, 17m.12/21s I can feel Charlie's voice and its easy to feel someone else's voice by placing your hand on their shoulder or chest you'll feel lows in your hand and arm.
"Do you want to see the ruins my friend" also felt is when Zane places his hand on the alien/humans chest and pushes him out the elevator. I can this though the armrests and partly the seat back but its not at the same mild pressure when someone does that to, you! If you do it to yourself you know where your hand is going to be placed and its not as threatening as someone, doing it to you!
I have plans to fit a Puck into the seat back with plenty of room its just how? How do I do it without any holes being drilled into the seat back the Puck would be fitted inside as the seat all comes apart.
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I threw the box out with all the packing inside it! D'oh! Well I might be able to SAVE THE FOAM! SAVE THE FOAM! I 'll have to pull the box out of the wheelie bin.
keep it running. Some electronic consumers get lucky on some. I think my Yamaha DSR-70 Pro, have last long without problems and I bought a second one 15 so months ago and even that's in working order. The Kenwood KRF-X9050D THX select, has had issues in the past 20 months with dry joints on the soldering. Even the remote buttons feel out sigh