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2 Buttkicker lfe's Not Enough

post #1 of 10
Thread Starter 
Since lurking around in these subwoofer forums I've wanted to add another dimension to my home theater experience so as I've been reading the Shaker Sticky thread I'd figure I would pull the trigger on some bass shakers to install in my theater seats. Well my theater seats is broken down in sections and is not one solid piece so I figured the best way to do it would be to build a platform for my theater seats to sit on then I would put rubber isolators between the platform and carpet floor.

I ran across a good deal on 2 used Buttkicker lfe's with the 1000 watt Buttkicker amp and wired them in parallel as recommended. I originally was just going to build the platform to JUST be big enough to place the seats on but once I got going it kept getting bigger and eventually ended up to a beautifull Mohagany stained clear coated 12 ft x 7 ft platform. I used 3/4" cabinet grade plywood for the top and framed it with 2x4s and it must weigh at least 400lbs or so.. I'm just guessing but it's heavy.

So really I don't think 2 lfe's are enough to shake the weight of:
1. ~400 lb platform
2. ~200 lb theater seats
3. ~(200 to 700lb) people depending on how many watching at a time (seats 4 total)

It produces a nice rumble but nothing like the youtue vids I've been seeing as well as people on the forum have been talking about. I'm just not completely satisfied with the results from all the work I've put into this project so I'm wondering if there's too much weight for those poor things to handle or what?

I don't want to shell out more money for 2 more (kind of stretched my budget getting 2 in the first place) so I was wondering if I can run some Aura shakers inside the seats and keep the 2 Buttkickers on the platform or add Aura shakers to the platform or what?

I know I can run up to 4 lfe's on the Buttkickier amp but can I run Aura pros with lfe's on the same amp or is that not a good thing to do?
post #2 of 10
Thread Starter 
Any advise... Help please?
post #3 of 10
Thread Starter 
Bump... Not one reply yet???
post #4 of 10
I think most, if not all, reclining seats come apart for transport. So don't worry about them not being one solid piece. I have one Aura Pro shaker mounted directly to each of my seats and they provide more than enough shaking. Try the buttkickers mounted directly to your seats and I think you'll like them a lot better.
post #5 of 10
What subs are you using? I don't think the butt-kickers are a real replacement for the air pressurization that serious bass brings. My seats get a nice vibration, and I don't have any kind of shaker connected to them.
post #6 of 10
Attach them directly to the chair they work your platform is damping the dynamics.
post #7 of 10
Thread Starter 
My sub is a MFW 15. I would try mounting them directly to the seats but its in 5 sections. I guess I can try it but I've read people saying they get a more realistic experience if the whole platform shakes under you. I wanted it to feel like the whole room was shaking
post #8 of 10
Quote:
Originally Posted by Milez28 View Post

Since lurking around in these subwoofer forums I've wanted to add another dimension to my home theater experience so as I've been reading the Shaker Sticky thread I'd figure I would pull the trigger on some bass shakers to install in my theater seats. Well my theater seats is broken down in sections and is not one solid piece so I figured the best way to do it would be to build a platform for my theater seats to sit on then I would put rubber isolators between the platform and carpet floor.

I ran across a good deal on 2 used Buttkicker lfe's with the 1000 watt Buttkicker amp and wired them in parallel as recommended. I originally was just going to build the platform to JUST be big enough to place the seats on but once I got going it kept getting bigger and eventually ended up to a beautifull Mohagany stained clear coated 12 ft x 7 ft platform. I used 3/4" cabinet grade plywood for the top and framed it with 2x4s and it must weigh at least 400lbs or so.. I'm just guessing but it's heavy.

So really I don't think 2 lfe's are enough to shake the weight of:
1. ~400 lb platform
2. ~200 lb theater seats
3. ~(200 to 700lb) people depending on how many watching at a time (seats 4 total)

It produces a nice rumble but nothing like the youtue vids I've been seeing as well as people on the forum have been talking about. I'm just not completely satisfied with the results from all the work I've put into this project so I'm wondering if there's too much weight for those poor things to handle or what?

I don't want to shell out more money for 2 more (kind of stretched my budget getting 2 in the first place) so I was wondering if I can run some Aura shakers inside the seats and keep the 2 Buttkickers on the platform or add Aura shakers to the platform or what?

I know I can run up to 4 lfe's on the Buttkickier amp but can I run Aura pros with lfe's on the same amp or is that not a good thing to do?

How did you construct the riser? You want the platform to be "suspended". The way to do that is to use a frame that is the height you want and then use "joists" that are shorter. Then mount them so the tops of the joists are level with the top of the frame, and the bottoms of the joists are *not* touching the floor. This will suspend the platform and give it some spring. It's a lot easier to shake it if it's suspended.

This how I constructed my platform. I used 2 x 8's for the outside framing and 2 x 6's for the joists. You can see my installation here:
http://www.avsforum.com/avs-vb/showt...0#post21093230
On the following page of that thread page, I described my set up and the benefits of tactile motion. Further down there are more pictures of the final install.

I use Crowson tactile actuators placed directly beneath the seating. The seats are also sitting atop rubber motion isolators. The combination of the suspended riser and the motion isolators provides shaking/vibration to the entire riser and the chairs. It can get really crazy. The other night, my brother-in-law was over and we watched Thor. There is an enormous amount of deep bass in that movie. Afterwards, my B-I-L's comment was, "Wow! That was a lot of sensory input!"

Also, I described how I set up the signal-flow for my system here:
http://www.avsforum.com/avs-vb/showt...3#post21687493

Good luck with the Buttkicker LFE's.

Craig
post #9 of 10
Quote:
Originally Posted by Milez28 View Post

My sub is a MFW 15. I would try mounting them directly to the seats but its in 5 sections. I guess I can try it but I've read people saying they get a more realistic experience if the whole platform shakes under you. I wanted it to feel like the whole room was shaking

If the riser is already constructed and it's not suspended, another thing you could do is to get some of the motion isolator pads and mount them to the bottom of the riser, essentially suspending the whole riser. Then the whole riser would shake. The pads are cheap, $10 each, and they're available here:
http://crowsontech.com/go/crowsontec...us&itemid=3453
Depending on the size of the riser, you might need 6 or 8 of them.

(Re-reading your original post, I see you used 2 x 4's, and your platform is 12' x 7'. In that case I suggest you get 10 isolators and place one under each corner, plus two under the 12' sections and one under the 7' sections. That should be enough isolation to allow good shaking, but still be enough support to ensure you don't have structural issues with your riser.)

Craig
post #10 of 10
Thread Starter 
Thanks for the responses Craig. I've reesearched the crao out of this befor I started and yours was one of the ones that made me want to do the riser too.

I did use actually 12 rubber isolators but they feel like they don't give that much. I used the ones from markertek http://www.avsforum.com/avs-vb/showp...postcount=2108

I have pics of the build I will try to upload Monday. Right now I'm using my phone
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