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#313393 - 07/05/10 03:40 PM GRAMMA Isolation Riser for Subwoofer?
Zak Offline
old hand

Registered: 01/13/08
Posts: 62
Loc: Calgary, Alberta
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




Edited by Zak (07/05/10 03:51 PM)
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Panasonic TC-P65V10 65" Plasma
Sony KDL-55XBR8 55" LED LCD
Yamaha RX-V3800
Axiom Epic 60 - 500 (7.1)

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#313398 - 07/05/10 04:08 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: Zak]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1277
Loc: Fishers, Indiana, USA
I don't have the Gramma, but I have the Aurolex MoPads that I use for my center and it works wonderfully.
_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos, 1 AxiomAir N3

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#313399 - 07/05/10 04:30 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: SRoode]
htnut
Unregistered


How did you position them under the VP180? Aren't the MoPads only 12" deep?

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#313402 - 07/05/10 05:14 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: ]
ClubNeon Offline
connoisseur

Registered: 02/06/09
Posts: 3466
Loc: Western Maryland, USA
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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#313405 - 07/05/10 05:34 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: ClubNeon]
SRoode Offline
connoisseur

Registered: 03/20/08
Posts: 1277
Loc: Fishers, Indiana, USA
(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).
_________________________
2 M80s, 1 VP180, 4 QS8s, 2 EP800s, 4 Algonquins, 2 M3 VaSSallos, 1 AxiomAir N3

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#313407 - 07/05/10 05:36 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: ClubNeon]
htnut
Unregistered


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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#313408 - 07/05/10 05:38 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: ]
htnut
Unregistered


oops, we must've been typing at the same time

thx for the info smile

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#313458 - 07/06/10 08:11 AM Re: GRAMMA Isolation Riser for Subwoofer? [Re: ]
PTPlayers Offline
veteran

Registered: 03/03/09
Posts: 129
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]
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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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#313504 - 07/06/10 02:56 PM Re: GRAMMA Isolation Riser for Subwoofer? [Re: PTPlayers]
Griffith Strife Offline
old hand

Registered: 04/09/10
Posts: 64
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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#313585 - 07/07/10 10:05 AM Re: GRAMMA Isolation Riser for Subwoofer? [Re: Griffith Strife]
alan Offline

connoisseur

Registered: 01/29/02
Posts: 3256
Loc: Toronto/New York/parry Sound
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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