GRAMMA Isolation Riser for Subwoofer?
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Joined: Jan 2008
Posts: 65
old hand
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OP
old hand
Joined: Jan 2008
Posts: 65 |
Has anyone tried using one of these risers with their Axiom sub? I'm thinking of ordering one for my EP500 v3. The dimensions are perfect for the EP500. Zak GRAMMADimensions: 23" long x 15" wide x 2.75" high Weight Limit: 300lbs. GRAMMA Isolation Riser
Last edited by Zak; 07/05/10 07:51 PM.
Panasonic TC-P65V10 65" Plasma Sony KDL-55XBR8 55" LED LCD Yamaha RX-V3800 Axiom Epic 60 - 500 (7.1)
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
Joined: Mar 2008
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I don't have the Gramma, but I have the Aurolex MoPads that I use for my center and it works wonderfully.
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: GRAMMA Isolation Riser for Subwoofer?
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htnut
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htnut
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How did you position them under the VP180? Aren't the MoPads only 12" deep?
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Feb 2009
Posts: 3,466
connoisseur
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connoisseur
Joined: Feb 2009
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I would imagine he just has parts of the speaker which aren't directly supported by the foam. If you use all 4 of the MoPads under the center it would still give more than enough support/isolation.
Pioneer PDP-5020FD, Marantz SR6011 Axiom M5HP, VP160HP, QS8 Sony PS4, surround backs -Chris
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Mar 2008
Posts: 1,378
connoisseur
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connoisseur
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(Last post before 1000.. Took several years).
I use the Mopads on the outer sides. They come in "slivers" which allow you to adjust the angle as needed. In the end, I only needed to support the speakers on the outer edges, so only 2 Mopads are being used for the VP180 (currently).
LFR1100 Actives,QS10HPx2,QS8x2,EP800,M3x4,M3x2 (Wood),M5HPx2 (Wood),AxiomAir,ADA1500-8,ADA1500-7
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Re: GRAMMA Isolation Riser for Subwoofer?
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htnut
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htnut
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Oh right, he's probably using them level. I wonder how / if they can still be used to angle a VP180 or M80.
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Re: GRAMMA Isolation Riser for Subwoofer?
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htnut
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htnut
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oops, we must've been typing at the same time thx for the info
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Mar 2009
Posts: 129
veteran
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I made two of them for my friend and I for about $10 dollars each using mdf , carpet for car stereo speakers and foam from the packaging from my SVS . [img] http://forum.blu-ray.com/album.php?albumid=571&pictureid=4282[/img]
XPA-3 VP-180v3 M80v3 Svs PC-12 Plus SVS SSS-2 PS-3 Sharp 60" LED OPPO BDP-93 Anthem MRX500
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Apr 2010
Posts: 64
old hand
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old hand
Joined: Apr 2010
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Sorry for asking this but what does a riser do? And what does mopads do for the VP180?
M80s QS8s VP150 SVS 25-31 Rotel RSX-1560
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Re: GRAMMA Isolation Riser for Subwoofer?
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Joined: Jan 2002
Posts: 3,270
connoisseur
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connoisseur
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Hello Griffith
No apology necessary for asking a perfectly legitimate question. Looking at the physics of the riser/mopad, it would reduce or suppress mechanical vibration of the subwoofer cabinet or the VP180 enclosure from being transmitted to the surface below.
However it would do nothing to prevent the acoustical vibration generated by the subwoofer's sound waves or the VP180's acoustical output from resonating the floor or surface beneath the center channel, respectively. To claim otherwise would contradict fundamental rules of science and the propogation of sound waves.
You could accomplish the same end by using four tennis balls under the subwoofer or those squishy rubber balls under the VP180. However, they would look peculiar---if you could see them.
Regards, Alan
Alan Lofft, Axiom Resident Expert (Retired)
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