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Best of Breed
The Buttkicker is a "tactile transducer", meaning it turns sound into shaking. It's just one of four players in that niche; the others are Clark Synthesis, Aura Bass Shaker and Crowson. But the Buttkicker is the best; the Clarks are less intense and less concentrated in the low frequencies, the Auras are $20 units with all that entails (such as lack of shake and lack of finess) and the Crowsons are purely under-couch devices.

The Buttkicker adds a bit of shake to your home theatre. It doesn't replace the subwoofer, but sort-of turns the floor into a lower subwoofer. And I love it. But there are some things you should know.

It needs a LOT of power, so this LFE Kit (with Amp) is probably the best choice to start with because you can't drive it from your receiver.

Second, one LFE Kit will do a sofa nicely, but if you, like me, mount it under your floor, you're gonna need two. Possibly more, but probably two. Because that's a LOT more mass to shake, and otherwise they'll be maxxing out and making a loud knocking noise. (You can drive up to four Buttkickers with a single Buttkicker Amp.)

Third, it's not like riding a rollercoaster. You'll feel the floor shake from loud sound effects, bombs, etc., but don't expect magic. It makes the movie more real, but it doesn't toss you around.

All that said, it's a great addition. If you can afford the cost-of-entry, you'll be amazed how shallow the system feels with it off.

A real kick in the pants!
I'm a gadget guy with a decent home theater set up, so when I learned about the buttkicker, I figured "why not"? and ordered the kit with the wireless connection unit.
The equipment is of good quality and easy to set up. The "buttkicking" effect is awesome and syncs perfectly with sub (the bass signal is simply split between the sub and buttkicker amp).
You'll be amazed at how much more in tune you'll be with a movie's bass signal. Occasionally, you'll feel some bass that doesn't quite feel right because you don't hear it in the movie, but it is there. You'll quickly become addicted to the buttkicker. I have two rows of seating in my theater set up and only the second row has the buttkicker installed. We never sit in the 1st row any more!
If you really want to give the buttkicker a test run, I highly recommend any of the Matrix movies- insane amounts of bass!
My only complaint is with the wireless unit. Be forewarned if you go that route that the wireless RF unit can pick up noise fairly easily. The end result is that the buttkicker will jump and jerk when it isn't supposed to. It took me some time to tweak the wireless unit to work properly. It's nice not to have to run a wire the whole way back to your seating, but you may find more frustration in trying to use the wireless connection.

In conclusion, this is a great product and a must buy to complete a home theater set up.

Felt like I was in the spaceship with Luke Skywalker!
I just bought this for my husband for a holiday gift. Personally I thought it was ridiculous and couldn't even believe I would buy something called a "buttkicker". Husband was thrilled to get it and installed it very quickly--said it was easy--that very night we watched Star Wars. WOW--it really works and it felt like I was in the spaceship!!!! The next day we watched Lilo and Stitch with our 2 small kids--they loved it! It really does give you the being at the movies effect. My ony regret??? I'm not sure that I will be able to get my husband out of the home theater room!!!!!!! Arrggghhh!!! Serioulsy--I highly recommend!