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  • Auralex Great GRAMMA 2.75 Inches high, 3 Inches by 19 Inches Amplifier Acoustic Isolation Riser, Charcoal
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Auralex Great GRAMMA 2.75 Inches high, 3 Inches by 19 Inches Amplifier Acoustic Isolation Riser, Charcoal

110 customer reviews

List Price: $109.99
Price: $99.99 & FREE Shipping
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In stock.
Usually ships within 4 to 5 days.
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Great GRAMMA
Great GRAMMA
  • yields nearly total acoustic isolation, resulting in a purity of tone that has to be heard to be believed
  • helps you achieve a more natural tone
  • get the sound you want out of any room!
  • perfect for a 4x12 cab!
4 new from $99.99 1 used from $89.99
$99.99 & FREE Shipping In stock. Usually ships within 4 to 5 days. Ships from and sold by Guitar Audio.

Frequently Bought Together

Auralex Great GRAMMA 2.75 Inches high, 3 Inches by 19 Inches Amplifier Acoustic Isolation Riser, Charcoal + Auralex SubDude-II 1.75 Inches High, 15 Inches by 15 Inches Subwoofer Acoustic Isolation Platform, Charcoal + Auralex MoPAD-XL 2 Inches tall and 12 Inches by 8.75 Inches Monitor Acoustic Isolation Pads, Charcoal (1 Pair)
Price for all three: $199.97

These items are shipped from and sold by different sellers.

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Product Description

Color: Great GRAMMA | Style: Great GRAMMA

Built on the success of GRAMMA, the Great GRAMMA is almost 30% bigger to float large speaker cabinets. Now 4x12s, 15" or 18" speaker cabinets will benefit from the awesome Great GRAMMA. Only Great GRAMMA can handle the big rigs!

Product Details

Color: Great GRAMMA | Style Name: Great GRAMMA
Need help choosing the right acoustic treatment? Get a free personalized room analysis from Auralex. Auralex Room Analysis [215kb PDF]
  • Product Dimensions: 30 x 2.8 x 19 inches
  • Shipping Weight: 10.6 pounds (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
  • ASIN: B000FDU2UK
  • Item model number: GREAT GRAMMA
  • Average Customer Review: 4.6 out of 5 stars  See all reviews (110 customer reviews)
  • Amazon Best Sellers Rank: #37,746 in Musical Instruments (See Top 100 in Musical Instruments)
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at Amazon.com: April 14, 2006

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

26 of 26 people found the following review helpful By D. on March 8, 2010
Style Name: GRAMMAColor: GRAMMA Verified Purchase
I purchased this for the subwoofer in our home theater. It's the same thing as a Subdude, only it's larger and not as nice looking.

This device has made a noticeable difference in the sound of my BIC America F12. Before I had this, the sub was noticeably boomier and rattled the pictures on the walls in our living room. It shook the floor. While that's kind of a neat feeling, the sub could be heard and felt throughout our house, meaning it had to be turned way down after bedtime.

Once this was added and the sound was re-calibrated, the pictures stopped rattling and you felt the bass more in in your chest. Also, it can be played at much closer to normal levels late at night without waking anyone up. The sound is more focused in the the living room.
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23 of 25 people found the following review helpful By Eric R. Shelton on September 25, 2004
Style Name: GRAMMAColor: GRAMMA
I've been playing bass for a classic rock cover band through an Ampeg 328. I love my amp. It's not a 400-watt monster, but it suits my needs since I'm primarily a guitar player. The problem was, it sounded great in my own rooms, but our practice room is in a portable (nothing under the floor) and most stages are elevated platforms. My understanding is the floors were acting like a membrane that absorbed my sweet tone. And volume. It sucked. But no more!

I bought this thing at a local store after reading all the reviews, and because I was offered a 30-day return policy. That 30 days is going to expire and I WILL NOT give up my GRAMMA. I gigged with it the first night I had it and my amp sounded AMAZING. 150 watts through 2x8's, and I was easily heard among the drums and lead guitars using tube amps. My amp sounded like I've wanted to sound since I've been playing with this band. It was the first time I realized my amp wasn't worthless. All the guys in band were blown away at the difference it made. It truly does isolate your amp so it's only moving air, like the manufacturer intended, and gives you the sound and tone you should have. Seriously, I'm a pretty peaceful guy, but I'll fight someone who tries to take my GRAMMA.

I don't know if guitars would really benefit because of their higher frequencies, but if any speakers are hard for you to hear the GRAMMA could be a great solution that'll cost hundreds less then replacing your rig or monitors. I give it a gigging bassist's two thumbs up.
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14 of 14 people found the following review helpful By XEagleDriver on February 7, 2009
Style Name: GRAMMAColor: GRAMMA Verified Purchase
Purchased the Auralex GRAMMA amp isolation riser in Dec 08 to use with a SVS PB10-NSD subwoofer in an upstairs home theater room which was causing house rumble and plaster pops (over dry wall nail/screws). The GRAMMA worked like a champ, no more house rumble, no additional plaster pops for an inexpensive price. Wife is happier and the sub even sounds clearer! Well made product, defintiely recommend.
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15 of 16 people found the following review helpful By Amazon Customer VINE VOICE on April 19, 2010
Style Name: Great GRAMMAColor: Great GRAMMA
Okay I'll admit it. I fully bought into the concept of using a SubDude/Gramma with hardwood floors. Isolating a sub or any speaker from a hard surface makes a huge difference. That makes perfect sense to me. And I bought into the concept of apartment dwellers using a SubDude/Gramma to somewhat reduce issues with downstairs neighbors. All of that makes perfect sense. But my home has a concrete slab, topped with 5/8" of good carpet padding, topped with some fairly luxurious carpet, so who needs a SubDude? Well last week curiosity got the better of me and I picked up a Great Gramma and after a bit of wrestling got it under my huge SVS PB12 Plus/2 subwoofer.

I am now officially a true believer. The PB12 Plus/2 has been described by professional reviewers as an "earthquake in a box". It's still an "eathquake in a box" but that deep bass just seems much soother, more natural and better defined. Instead of sounding like deep powerful bass coming from a beast of a subwoofer that deep rich powerful bass is just there - disembodied - with no attention drawn to the sub. Seamless and transparent but just as strong. I'm impressed enough that I just bought the smaller SubDude for the little subwoofer in my master bedroom.

The only downside to the Gramma/Great Gramma is appearance. Auralex makes the HD version of the SubDude as a slightly more attractive version for home use. There is no "home" version of the Great Gramma. It has that slightly scruffy look of professional audio gear. That's okay I can live with that. It's worth it for the improved sound.
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11 of 11 people found the following review helpful By Justin on June 13, 2009
Style Name: GRAMMAColor: GRAMMA Verified Purchase
I live in an old apartment, and my sub would rattle everything on the walls. After getting the GRAMMA, I am able to turn the bass up, get cleaner lows, and minimal rattle. Plus the neighbors below me are thankful, as the bass isn't slamming, and much more mellow. Overall I need to buy more of these.
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10 of 10 people found the following review helpful By tman on February 22, 2010
Style Name: GRAMMAColor: GRAMMA Verified Purchase
Installed it under a Hsu VTF3.3 subwoofer sitting on a wood subfloor with wide spacing of support piers. From reviews I was prepared for some improvement but for this case, the improvement in sound quality was quite amazing. Much tighter bass, improved low frequency, reduced transmission of sound to other parts of the house. Wow.
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9 of 9 people found the following review helpful By James W. Hines on May 11, 2005
Style Name: GRAMMAColor: GRAMMA
Absolutely incredible! I now fear no room :)

This board tightens up the sound of my Eden 4-10 bass amp and gives such an incredible clarity and punch regardless of the room I'm working in.

I had 2 but let a friend use one for his studio .....it hasn't come back yet!
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