Since you have the Subdude, how did it help with the sound/vibrations of the sub?

I had no rattles in my room, so I can't speak to its ability to quell those. With no measuring equipment I feel like my opinion isn't much, but the bass sounds, to my ear, tighter and more plosive. Make no mistake--it still slams the room. There are still floor vibrations and if I weren't careful I'd still get an unfriendly visit from downstairs neighbors, or worse. It's not a license to kill ;) Just a nice little bump to sound quality and a reduction in room-shimmy. Your armoire full of Capodimonte porcelain figurines will be a little bit safer.


I Just recieved a FV12 ,and though the size is bigger than the subdude.
I read on audioholics that as long as the the sub does not have a downward facing driver you would not need the great gramma. Does anyone have experience with a larger front or side facing sub on a subdude?

I think you'll find that most people don't agree that driver orientation has much to do with it. Link?

Silly question but would it be better to just raise the sub by the legs instead of having an mdf board? As far as SQ, I thought it was better to have down firing subs raised higher but it seems with the subdude that you are countering the raising by having that mdf board in between. Still the same height off the "ground"? I'm sure it still helps with the vibrations though!

Silly question but would it be better to just raise the sub by the legs instead of having an mdf board? As far as SQ, I thought it was better to have down firing subs raised higher but it seems with the subdude that you are countering the raising by having that mdf board in between. Still the same height off the "ground"? I'm sure it still helps with the vibrations though!

The SQ difference (ymmv) is solely from reducing or eliminating the cabinet to floor resonances you might otherwise hear. The idea is simply to decouple the sub, not to change room modes or anything.

Just got my Subdude HD, and it didn't fit under my A2-300.. too small.

I had some extra rubber isolators from a buttkicker install. I put the isolators at the corners of the Subdude, and lined up the Subdude under the sub. Ghetto, yes.. but it seems to work well.

The rubber alone would probably do a good job of decoupling without the Subdude. I haven't tested everything fully yet, but my closet door no longer rattles during a loud LFE moment. I'm going to test with/without subdude plus rubber isolators to see if there is a big difference.

eD has their own isolation pad for your sub, if you wanted to return the subdude hd.

http://www.edesignaudio.com/product_info.php?cPath=2_126&products_id=950

I'd rather DIY my own, but that will fit for sure.

I need help. Yesterday I have a call from my neighbour about the vibrations from my sub. I need a solution to fix that, so I dont´t have to turn the sub down. My sub is Def tech Prosub 800(One 8" woofer pressure coupled to one 8" low bass radiator). I have laminate floor and don´t have a carpet. Is Gramma solution? How much vibrations he can reduce? I´m from Croatia and here Gramma is slightly expensive, but if it´s worth I will buy one.
If there is any other solutions for my problem, please let me know!

I need help. Yesterday I have a call from my neighbour about the vibrations from my sub. I need a solution to fix that, so I dont´t have to turn the sub down. My sub is Def tech Prosub 800(One 8" woofer pressure coupled to one 8" low bass radiator). I have laminate floor and don´t have a carpet. Is Gramma solution? How much vibrations he can reduce? I´m from Croatia and here Gramma is slightly expensive, but if it´s worth I will buy one.
If there is any other solutions for my problem, please let me know!

You have to turn the sub down.

You have to turn the sub down.

Yeah that is the simplest solution LOL, unless he wants to spend a lot of money to get a piece of foam and MDF(wood) shipped from USA to Croatia :-)

I am planning to partner with Home Depot to see if they can make a Granpa and sell it for some 20 bucks at Home Depot :-) A 15"x15" piece of MDF is probably $3, foam some $4, paint $1, glue $1, add $10 for profit/overhead.

Yeah that is the simplest solution LOL, unless he wants to spend a lot of money to get a piece of foam and MDF(wood) shipped from USA to Croatia :-)

I am planning to partner with Home Depot to see if they can make a Granpa and sell it for some 20 bucks at Home Depot :-) A 15"x15" piece of MDF is probably $3, foam some $4, paint $1, glue $1, add $10 for profit/overhead.

(Don't forget the to add a classy black velour "HD" option for $30)

eD has their own isolation pad for your sub, if you wanted to return the subdude hd.

http://www.edesignaudio.com/product_info.php?cPath=2_126&products_id=950

I'd rather DIY my own, but that will fit for sure.

Already scratched the Subdude with the spikes, no can do. The penn-elcom rubber isolators on the corners with the pad under the woofer works fine. Noticeable reduction in room vibrations, so it suits my needs.

This is now past the 65-Days and is considered an Old-Thread.
But IMO I think it is worth bringing back to New Members that might not be aware of these Auralex products.

I just went through this complete Thread/Post and man there a lot of mixed opinions on Auralex products.

I took what the majority said, (Positive Results) and got with my A/V Dealer/Rep. and we just ordered,
4-Auralex Great GRAMMA's and 1-pair of Auralex MOPAD isolation pads for my rear
JML Mini Utopia surrounds mounted on shelves to the rear wall.

I have 4-Mirage BPS-400 Subs.

This has been a most informative Thread and the Post on it.

I rate the overall content of this Thread 4-stars !!!

Glad I found this Thread as well as the others on this topic here on AVS.


Terry

Im upgrading my sub to either the rythmik F15HP or the FV15HP and im interested in the gramma pad since i live in a townhouse with carpet over wood floors. The regular gramma would have my sub overhang 2 in on the left and right side but fit the depth perfectly. The great gramma would fit the sides perfectly but would have 9 in of extra depth on the pad. Which would be preferred if it even matters either way?

If your subwoofer is larger than the isolation platform this will not have an effect on decoupling performance. Having the platform larger will also not make any difference. These are just visual differences. So just pick which platform fits your sub and available space best.

If your subwoofer is larger than the isolation platform this will not have an effect on decoupling performance. Having the platform larger will also not make any difference. These are just visual differences. So just pick which platform fits your sub and available space best.

Thanks. I feel the sub hanging off the sides 2 in on each side will look a little odd so i will probably go with the larger pad and have the extra pad space behind the sub.

Here are a few Pics. of my Auralex Great Gramma Isolation pads.

The 19" was perfect fit but they need to be "Cut" to fit the other way.

This will give some of you some added insight on how you can get these to look perfect when Modified to fit your subs.

Basically they measured the Sub, marked both sides of the Great Gramma, cut it, folded over the Felt, stapled it and it looked perfect.

http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall004.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall001.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall008.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall009.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall010.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall014.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall024.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall033.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall031-1.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall030.jpg



Terry

Nice job. You even got the Auralex logo centered. I'm anal like that to. I guess you won't see it with the subwoofer sitting on it though.

Nice job. You even got the Auralex logo centered. I'm anal like that to. I guess you won't see it with the subwoofer sitting on it though.
Secret Squirrel,

I also have the "Auralex MOPAD Monitor Isolation Pads under the relocated JML Utopia Mini rear surrounds.
(These Mini JML speakers weigh a healthy 60 Lbs. each)
They Isolate them from the Custom Shelves and give them the necessary 8-Degree Tilt needed.

http://i258.photobucket.com/albums/hh279/tigerhonaker/AuralexMOPADisolationpanelsrearsurrounds001.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/AuralexMOPADisolationpanelsrearsurrounds008.jpg



Terry

Very nice speakers Terry. I plan on getting an Auralex Great Gramma for my SVS PB12-plus. I live on the second floor of my apt and I don't want to take any chances with neighbors. I know turning the sub down will help the most.

Very nice speakers Terry. I plan on getting an Auralex Great Gramma for my SVS PB12-plus. I live on the second floor of my apt and I don't want to take any chances with neighbors. I know turning the sub down will help the most.

Turning the sub down is the only thing that will help.

If your subwoofer's enclosure has a large amount of resonance--like, it dances around when you use it--then the Gramma can reduce that vibration's propagation through the floor.

I doubt that your very excellently designed and built subwoofer has much cabinet resonance to speak of.

Gramma notwithstanding, your sub is going to shake the air; this air-shake is going to shake the walls. This wall-shake is going to reach adjacent walls.

I'm an apartment dweller so I feel your pain (and your hope) but there's no shortcut to being a good neighbor :(

No matter what you do, a beast like PB12-plus is going to shake the entire building. It is an over kill for an apt. and even at low volume the neighbors going to get pissed off.

You dont throw stones when you live in a glass building. Same way, you dont buy a subwoofer when you live in an apt. :-)

No matter what you do, a beast like PB12-plus is going to shake the entire building. It is an over kill for an apt. and even at low volume the neighbors going to get pissed off.

You dont throw stones when you live in a glass building. Same way, you dont buy a subwoofer when you live in an apt. :-)

Some of what you say here is true, but most of it overstates your case. You've not been in every apartment, dealt with all neighbors, etc. Lots of people on this site coexist with neighbors and powerful subwoofers simultaneously. It just takes a little responsible self-policing.

I cant believe people pay for those mini pads. They look worse than the free PC packaging foam that I posted before. This is called "rip off"

Really? From your bajillion posts on the topic I'd gathered that you stand by the product and its manufacturer's claims 100% :rolleyes:

Very nice speakers Terry. I plan on getting an Auralex Great Gramma for my SVS PB12-plus. I live on the second floor of my apt and I don't want to take any chances with neighbors. I know turning the sub down will help the most.
Thanks,

I can tell you that my HT is the Bonus Room over the 2 1/2 car garage below.
The Great Gramma's make a HUGE difference in the sound.
They also have really helped to keep the dishes from Rattling in the kitchen which is the other side of the rear wall of the HT.

My opinion is get them as they can certainly do no harm.
They can only help in your situation.

http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall033.jpg



http://i258.photobucket.com/albums/hh279/tigerhonaker/Runco%20VX-11d%20%20Dec%202011%20Christmas/AuralexisolationpanelsRuncoinstall031-1.jpg



Terry

Do I need a subdude for my Empire that is sitting on ceramic tile over a concrete slab?

Do I need a subdude for my Empire that is sitting on ceramic tile over a concrete slab?

the answer is no, but i used a gramma/subdude on my marble tile over concrete and I found it to benefit, but very very slightly. Not as boomy, but then that could be just me justifying my purchase.

the answer is no, but i used a gramma/subdude on my marble tile over concrete and I found it to benefit, but very very slightly. Not as boomy, but then that could be just me justifying my purchase.

Much thanks! My empire should arrive in a couple of days and from everything I have ever read about it, boomy isnt an issue..

Much thanks! My empire should arrive in a couple of days and from everything I have ever read about it, boomy isnt an issue..

ratm you shouldn't need an isolation riser/decoupler with a dual opposed design. I use 2 subdudes for my PB12-Ultra/2 but don't need anything at all for my Submersives or Empire.
Tim

Thanks for the thread guys! I just ordered a Gramma for my new Outlaw LFM-1 plus. My living room (HT room) just got super thick carpet and the thickest pad I could find and I'm having a hard time keeping the sub from contacting the carpet. I'm betting that the Gramma will help greatly!

Thanks for the thread guys! I just ordered a Gramma for my new Outlaw LFM-1 plus. My living room (HT room) just got super thick carpet and the thickest pad I could find and I'm having a hard time keeping the sub from contacting the carpet. I'm betting that the Gramma will help greatly!

It will definitely help in that reguard I have a plus and was worried about contact as it was settling into the pad. I also had a lot of floor vibrations causing pictures to rattle. The Gramma made my sub output louder (I'm assuming because of it being raised out of the carpet) and cut down on vibrations significantly.

It will definitely help in that reguard I have a plus and was worried about contact as it was settling into the pad. I also had a lot of floor vibrations causing pictures to rattle. The Gramma made my sub output louder (I'm assuming because of it being raised out of the carpet) and cut down on vibrations significantly.

Good deal! My floor isn't reall stable either, I can feel it when people walk by. I've had to turn up the sub more than I'd like too, so I'm hoping it'll be working more efficiently so I should be able to turn it down AND get better frequency response! :)

No matter what you do, a beast like PB12-plus is going to shake the entire building. It is an over kill for an apt. and even at low volume the neighbors going to get pissed off.

You dont throw stones when you live in a glass building. Same way, you dont buy a subwoofer when you live in an apt. :-)

Wow! Thanks for the advice. After careful consideration of your comments, I have decided to return my sub to SVS. Thanks for steering me in the right direction. I feel a whole lot better now.

Wow! Thanks for the advice. After careful consideration of your comments, I have decided to return my sub to SVS. Thanks for steering me in the right direction. I feel a whole lot better now.

The above statement is of course not true, but I did want to thank Terry and SaviorMachine for your input. I did appreciate that.

The above statement is of course not true, but I did want to thank Terry and SaviorMachine for your input. I did appreciate that.

Glad to be of service! You know, in another thread, AVS veteran and generally knowledgeable guy Bill Fitzmaurice said that isolation pads actually reduce the floor vibration that is directed upward at the speaker (not downward as is more intuitively guessed). Maybe this explains how a high quality, low-cabinet-resonance sub is improved by an isolator like the Auralex models. Not sure but it's something to think about.

The above statement is of course not true, but I did want to thank Terry and SaviorMachine for your input. I did appreciate that.
Your Welcome :D

I can tell you I have now had all the Auralex isolation panels/pads long enough for me to try them out.
They definitely work and glad we went with them.
Under the 4 Mirage BPS-400 Subs they have made a major difference.
No more sound coming from the floor of the HT which is the Bonus Room over the 2 1/2 car garage.
No more dishes rattling in the kitchen which is on the other side of the rear wall to the HT.

Terry

The only issue i have with Auralex isolation panels/pads{ i hope they read this thread}
I they only make ~{can't remember} ~ three different sizes?
I would like them to make a size just for "my size sub". There are most likely today about 20 different size sub out there. ( ones good enough that people will pay more$$ for assessors ).
You could chose your sub size- not the one size fits all---concept.
If a new entrepreneur comes along and give his customer that option he might become the next...

The only issue i have with Auralex isolation panels/pads{ i hope they read this thread}
I they only make ~{can't remember} ~ three different sizes?
I would like them to make a size just for "my size sub". There are most likely today about 20 different size sub out there. ( ones good enough that people will pay more$$ for assessors ).
You could chose your sub size- not the one size fits all---concept.
If a new entrepreneur comes along and give his customer that option he might become the next...

ED has many isolation platforms.

http://www.edesignaudio.com/index.php?cPath=2_126

They may still offer custom sizes as well.

Thanks- they just got into Book mark page. Nice to see.

Got my Great Gramma yesterday. So far I like the sound of the my SVS PB12-plus with this platform. The floor does not vibrate as much, which is a good thing since I live in an apt. The bass certainly seems to be more evenly distributed now.

Got my Great Gramma yesterday. So far I like the sound of the my SVS PB12-plus with this platform. The floor does not vibrate as much, which is a good thing since I live in an apt. The bass certainly seems to be more evenly distributed now.
Nice going. :D

I have 4 of them under my Subs and there is a big improvement for sure.

Terry

Nice going. :D

I have 4 of them under my Subs and there is a big improvement for sure.

Terry

Thanks Terry. By the way, I looked at all your pics of your HT system and I think everything looks really nice. That is one big Runco projector.

No matter what you do, a beast like PB12-plus is going to shake the entire building. It is an over kill for an apt. and even at low volume the neighbors going to get pissed off.

You dont throw stones when you live in a glass building. Same way, you dont buy a subwoofer when you live in an apt. :-)

I disagree...I had 4 15's in an apartment. They were 2 dual opposed mfw's with a behringer ep4000 powering them. All you need to do is not be a dumbass when it comes to playing them. When it is really late at night I use audyssey dynamic volume to make sure that I can still hear dialog when I have the system turned down. Whenever I demo my subs or want to play around with them I make sure that I do it during the day. All gig have to do is be respectful and smart about how you play them at certain times and you should have no problems. The grammas work great for getting rid of pesky vibrations being transferred to the floorboards just like they are supposed to. I am a strong believer that anyone can have any sub they choose and their living situation should have nothing to do with the sub purchase or what they want to run in their
home theater.

Good deal! My floor isn't reall stable either, I can feel it when people walk by. I've had to turn up the sub more than I'd like too, so I'm hoping it'll be working more efficiently so I should be able to turn it down AND get better frequency response! :)

You will not get any better frequency response by using an isolation pad/gramma with your sub. One day I wanted to see of I actually would indeed actually get better frequency response with my grammas. I took measurements with and without the gramma in place and there is actually no difference in frequency response. I believe that I do get a better sound but that could just be in my head. The only purpose for the isolation pads/grammas is to cut down on the transference of energy to the floors and walls. Basically things don't vibrate as much and thats all your gonna get.

Basically things don't vibrate as much and thats all your gonna get.

Yes. When stuff vibrates along with the sub it makes it sound horrible. You can't hear any detail. When you eliminate all vibrations you only hear the sub and that improves clarity and makes the sub sound so much better.

The only sound you should be hearing is the sub. Thats the point.

Had mine for 2 years under my MFW-15. I bought it because I was having vibration issues with the windows, baseboard heat covers, etc. Put the Gramma pad underneath and nearly all of the vibration issues have been solved since

Thanks Terry. By the way, I looked at all your pics of your HT system and I think everything looks really nice. That is one big Runco projector.
:D Thanks .........

Your right it is a rather large unit but being ceiling mounted it is up there so not in the way.

A very nice Surprise to me was the fact it is so quiet.
And I do run mine on the "High Lamp Setting".
My screen is a 123" Stewart Grayhawk so I want the picture bright and it is for sure.

Terry

I disagree...I had 4 15's in an apartment. They were 2 dual opposed mfw's with a behringer ep4000 powering them. All you need to do is not be a dumbass when it comes to playing them. When it is really late at night I use audyssey dynamic volume to make sure that I can still hear dialog when I have the system turned down. Whenever I demo my subs or want to play around with them I make sure that I do it during the day. All gig have to do is be respectful and smart about how you play them at certain times and you should have no problems. The grammas work great for getting rid of pesky vibrations being transferred to the floorboards just like they are supposed to. I am a strong believer that anyone can have any sub they choose and their living situation should have nothing to do with the sub purchase or what they want to run in their
home theater.

You have cool neighbors or a well made apt building. I agree discretion with volume can help, but in the 1920s buildings around here, even that was sometimes not enough. Heck in one building I thought "wow my neighbors watch porn pretty loud!" until I realized it wasn't a video.....

My pair of Hsu VTF-2 MK4 subs were sitting on carpet installed over hardwood flooring and they would really make quite a rumble during heavy bass audio tracks, so I purchased a couple of the Auralex GRAMMA isolators and slipped one under each sub and they made a huge difference. No more rumbling, vibrating floors, and bass tones sound much cleaner having all that rumbling removed.

After seeing how they were put together I feel like they wouldn't be too hard to put together myself, but I'm not regretting spending $50 each for them at all.

You have cool neighbors or a well made apt building. I agree discretion with volume can help, but in the 1920s buildings around here, even that was sometimes not enough. Heck in one building I thought "wow my neighbors watch porn pretty loud!" until I realized it wasn't a video.....

well I agree with him. I have a pretty decent sub (Outlaw LFM-1 EX) on a Gramma in an apartment (1st floor) and I more than crank it when I want to have fun and have yet to have a complaint (knock on wood). I've been enjoying it for almost a year now.

Just use common sense when using it...although I can't wait until next year when I move into a house I can truly enjoy it without worrying about a neighbor.