One of the Best 
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Yes , long time no see , bro. Now using 3 subs only , lazy to tune 
. More addicted to motion now.
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Bro , you have most scary HT mid bass . 
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I wondered how “scary” is that? Chest thumping scary !!!
He was just joking
Many members here i visited all have very high standard for bass.
Desray, you should know Jason Yeo also own MK speaker and sub before. He said MK sub is one of these good sub for mid bass… how you feel after owning these MK sub.
The last time i visited you when you are using the JL E112 the mid bass was good too. 
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Will be selling my JL Audio this weekend… going to miss them.
[Making the worlds most powerful subwoofer (Rotary Subwoofer) - YouTube]
(Rotary Subwoofer)
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Thanks to @Foodie recommendation, I am now the owner of a buttkicker mini LFE. Hope its enough for my chair. If not, the bigger buttkicker screws into the same mount
I plan to hook it to sub out 4 on the Denon X3800H, which, for Denon, is a dedicated channel for a bass shaker and has the appropriate configurable parameters.
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Nice…Enjoy!
Nice! Enjoy! I find it’s the best shaker below $200 that can go low below 20hz and no weird peak resonance at mid bass freq.
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Initial observations after setting up the Buttkicker Mini:
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I don’t have enough power. My amp puts out about 60W and the Buttkicker requires 60-250W. So I’ve ordered a 150-200W subwoofer amp. However, it is still reasonably effective in shaking the chair and integrates well with my 1000W near field subwoofer.
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It allows me to run the subwoofer on lower gain. Currently, my sub on about 40% gain shakes too many things in the room and around the house already even though it’s on six elastomer feet. My ceiling was shaking and the door was rattling before the Buttkicker, so running on lower gain allows me to get rid of some of the extraneous noises, while preserving the tactile effects. This may be the only reason I keep the Buttkicker in the loop.
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Right now, about 80% of the tactile feel still comes from the sub and 20% from the Buttkicker. In a sense, when you have a powerful nearfield sub, its already enough. You don’t really need a tactile transducer although the combination has its merits. If I turn the sub gain up another 10%, I can simulate the addition of the Buttkicker, but as I mentioned in the previous point, turning up sub gain increases the extraneous effects on the loose hardware in the room. One day, I might follow @Wechnivag and use bitumen, sorbothane etc to seal all the rattles, but that will be only if I renovate everything. At that point I can really turn it up to simulate an earthquake.
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The idea of a transducer is to “complement” the bass (40hz and below) at a reasonable “feel” (vibration). It should not call for too much attention. Just the right amount…not earthquake level as it will be too “jarring” and take you out of the movie.
40hz lpf is still too high for the shaker. It might give u unnatural tactile effects that u are not supposed to feel between 30-40hz.
Ideally the shaker shld only start shaking below 25hz if your subs can handle up to 20+hz well.
How low can your subs go while still maintaining low THD?
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Good suggestion. Unfortunately, that’s the lowest limit of the Denon transducer output. When my mono sub amplifier comes in, it has a variable lpf down to 20Hz, so I’ll try setting it at the minimum. I used to have a Harrison FMOD at 20Hz, but these tiny things disappear and I can’t find it.
On the current 20Hz tuning (I can plug another port to enhance 16Hz), the sub was measured by Audioholics at 106db@20Hz 2m nearfield with no compression and >110dB with slight compression. The reviewer didn’t run many sweeps above 106dB because things were falling off tables in his house 2 stories up. It’s a down firing sub, but I’m running it with the three 4 inch ports aimed at the seating position only a few inches away so I might have higher levels than the Audioholics measurement. Hence, the bass shaker adds tactile feedback to the chair, but as there is already a lot, the buttkicker is only a subtle but nice improvement and not most of the haptics. I’m actually afraid of damaging my ceiling or shattering glass on the door if I turn the sub gain beyond 50% so when I get the more powerful amp for the buttkicker, I might try turning the sub gain down further.
This is my first attempt at a tactile transducer, so I’m still experimenting. So far, it is quite unnatural for music except maybe drum music, where you feel like you are in the middle of the drum set. So it will definitely be off for most music.
As for action movies, its great and there is no limit for my desire for earthquake effect bass when say Captain America punches Thanos 
or Godzilla fights King Kong. For dramas, I agree that having things vibrate occasionally can take you out of the movie, but that was already happening with just the sub. So I have to play with the sub gain anyway, depending on the movie.
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Anyone know what FMODS these are? Not sure if they are my 20Hz or 70Hz.
If I recall, they have some association Indonesia so there should be a local distributor. I had bought mine from eBay.
Edit: That was a low pass 70Hz from the Harrison website and they don’t make below 50Hz. My 20Hz are actually high pass, which is not what I want.
Yes, I’m using one for 50Hz
One good and affordable way to low pass it below 40hz is to add a used Minidsp 2x4HD in your chain for your shaker. It can easily allow u to deploy a HC such that it gives higher shake as your freq decreases. This will allow u to have a close resemblance to the real tactile effect for low rumble.
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Good idea. Wonder if the Denon app will do that as well. I am using it for a HC right now. Will do it incrementally. First the new amp and play around with the lpf