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GRAMMA Isolation Riser for Subwoofer?
#313393 07/05/10 07:40 PM
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Zak Offline OP
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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


GRAMMA
Dimensions:
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)
Re: GRAMMA Isolation Riser for Subwoofer?
Zak #313398 07/05/10 08:08 PM
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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
Re: GRAMMA Isolation Riser for Subwoofer?
SRoode #313399 07/05/10 08:30 PM
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How did you position them under the VP180? Aren't the MoPads only 12" deep?

Re: GRAMMA Isolation Riser for Subwoofer?
#313402 07/05/10 09:14 PM
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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
Re: GRAMMA Isolation Riser for Subwoofer?
ClubNeon #313405 07/05/10 09:34 PM
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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
Re: GRAMMA Isolation Riser for Subwoofer?
ClubNeon #313407 07/05/10 09:36 PM
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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.

Re: GRAMMA Isolation Riser for Subwoofer?
#313408 07/05/10 09:38 PM
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oops, we must've been typing at the same time

thx for the info smile

Re: GRAMMA Isolation Riser for Subwoofer?
#313458 07/06/10 12:11 PM
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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
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M80v3
Svs PC-12 Plus
SVS SSS-2
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Re: GRAMMA Isolation Riser for Subwoofer?
PTPlayers #313504 07/06/10 06:56 PM
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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
Re: GRAMMA Isolation Riser for Subwoofer?
Griffith Strife #313585 07/07/10 02:05 PM
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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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