Auralex Subdude a MUST HAVE!! - Page 5

Depends on a lot of factors. Just be aware that carpet has negligible, if any, effects on low frequencies.

Unless you have thick carpet and a downward firing sub where the carpet actually touches the driver.

My PB10 resonates quite a bit up the wall and rattles the drop ceiling I have in my HT room. Will the subdude make an improvement? (Cement floor covered with thin padding and burbur carpeting)

Not unless you are above grade.

Help me out a little there, either I am not thinking or I haven't heard the expression "above grade" before.

Not unless you are above grade.
Not sure what the poster means but grade is ground level. Basements are usally below grade= ground. that's what I get out of it.

That is what I figured.

It is a basement HT but there is a wall behind it which is sheetrock on 2x6's, facing cinder blocks.

I don't understand why being below grade would matter if it's rattling your walls? I would think the subdude would help?? Dunno I don't have one

That's where I'm at as well.

If you are on grade (the concrete slab is on earth, such as in a basement), the slab will not transmit vibration very well. Hence, a SubDude will do next to nothing.

However, an above grade slab is not as rigid, damped, or as massive, and much more easily transmits vibration. In that case, a SubDude will be much more effective.

Thanks.

Would some sort of absorbtion material behind it (on the wall) help more? Is there a fairly inexpensive way to do this? (I see the $300 12" sheet of foam)

Quick suggestion for those looking for a cheap and easy alternative isolation for their SVS subwoofers, my SVS PB-plus/2 subwoofer came very well packaged and you can use the sturdy space shuttle foam type material that supported it from being damaged when it came as an isolation platform and it works extremely well at stopping vibrations getting to the floor it's 33 inches by 23 inches and 1 and a half inches thick and its so sturdy you can stand on this material and it doesn't bend and it was obviously designed to take the full weight of the SVS subwoofer and to protect it while being shipped, it's perfect for subwoofer isolation and i was able to use other pieces of this which came with the subwoofer to isolate other equipment.

Before i used it my floorboards shook a lot as they are wooden and now they don't shake at all.

I don't think it's really foam but i don't know what the material is called.

You don't have to cut it either so if you need to return your subwoofer you can re-use it easily enough.

While that's true, he does have vibrations, so whatever his configuration, LF energy *is* being transferred. I'd spend the $50 on a Subdude. Cheapest risk he can take.

Well, it's true that at $50, it may be wortth trying. I wouldn't be surprised if his problems are due to airborne sound rather than structure-borne sound though, in which case the SubDude will do nothing.

I have Sony SAWX900 (I know Sony is not appreciarted and recognized in the audiophile community) but this sub is a different animal. 2 (12") in push pull configuration (drivers made in US) with 1000 Watt rated Amp (Ice Power). Sub used to shake the walls when played any movies with low freq contact and volme control set above 1/3 volume. I tried using the spike feet came with the sub and it helped a little not to a great extent.

I read about the Auralex and ordered one from SweetWater. Oh boy what a difference it made. Now can hear the bass rather than feel it with more authority and punch. For about 50 bucks shipped, that is a huge improvement.

My sub is 19" x 19" (Mackie), so the Great GRAMMA would be perfect for me if I could shorten the long side a bit. Esthetics aside, will I be able to use a hacksaw to trim the GRAMMA? From what I read on this thread, the GRAMMA is made of an MDF board and some foam, so it should be no problem.

Has anyone trimmed their GRAMMA or Subdude? Did you find any metal "reinforcement" parts in it?

Thanks. Ales

well, a hack saw is made for metal, so if you find any in the wood, it shouldn't be a problem going thru it as far as your saw choices go......

Good answer. I guess there is always a way to trim the pad. I am mostly concerned about the amount of work required. If it's just MDF, it will be a 1-2 minute project. If the pad contains a metal sheet, I'm looking a major sawing project.

Ales

No, (assuming the Gramma is built like the Subdude) it's just MDF, wrapped in covering. Peeling the covering back would be tough because it goes under the acoustic foam. But you should be able to cut it and then peel back, then cut the wood.

Personally, I'd try to use it without cutting.

That's what I'll do first, but I suspect I'll be quickly told to cut off the "overhang."

The subdude/gramma at 23"x15" is only 4" longer and 4" narrower than your sub. Put the overhang to the rear and it will provide cable clearance. Or split the difference at only 2" front and rear. The underhang for the width is fine. It will still support the box. And, no cutting involved.

This really won't work because the sub has a downward-firing driver. The sub's little feet/spikes are 16 inches apart, so a 15" wide pad is not wide enough.

Ales

Auralex makes a larger Gramma.

I just bought this based on the recommendations here.

I live on the second floor of my condo so I thought maybe I could minimize some vibrations for my neighbors.

And hopefully it's an improvement in SQ for me as well.

I'll report back and tell you how it sounds.

Sweetwater should do a better job of showing the new size. It's there, but not as clearly as this place

http://truesoundcontrol.com/products/SUBDUDE.html


Is the old one 13x23 or 15x23 like the Gramma?