Speaker Floor Decoupling - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th November 2010, 05:22 AM   #1
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
Default Speaker Floor Decoupling

Dear All,

I'd like to hear your advice on how to solve a problems. the elements involved are the following:

1) Speakers Sonus Faber Grand Piano. They are floor standing on four points. The base is not perpendicular to the floor.

2) Neighbor. Living downstairs, standard model, did not complain yet.

3) Two granit slabs approx 2cm think to be placed under the speakers. Very heavy.

4) Daniel. 11 month terror toddler.

Now With the speakers on the floor I can hear the vibration of the floor under my feet even at low volume. The structures of the building is very elastic here in Japan because of earthquake resistance.

So I thought to put the slabs between the speakers and the floor.

Now the problem is that the metals points can easily slide on the granite if the terror toddler push on the speakers.

I was thinking about drilling small holes in the granite so that the point will sit into them and the speaker will not slide. Do you think this will defeat the purpose of the slabs in decoupling the speakers and the floor ?

What do you think would be the effect of a more intimate contact between the metal base of the speakers and the slabs would be ? What about screwing the speakers to the slabs ?


Thanks for helping,

Davide
  Reply With Quote
Old 9th November 2010, 08:19 AM   #2
diyAudio Member
 
Join Date: Mar 2006
Location: Bucharest
A granit slab between the speaker and the floor might not achieve the desired mechanical decoupling.

IMHO, what works is:
- good mechanical COUPLING of the speakers to the slabs (yes, you can also screw them, although best coupling is done by very small contact area like spikes)
- and good DECOUPLING of the slabs off the floor: you need some sort of elastic/viscous material (foam, rubber) which can take over mechanical vibration and absorb then

PS: you did not mention what kind of floor you have ?
__________________
I don't believe in audio believings.
  Reply With Quote
Old 9th November 2010, 10:41 AM   #3
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Iwould use the thin layer of foam under the slabs, maybe like they use under floating timber floors.

I would just drill a small shallow hole for the spikes & be done with it.

David
  Reply With Quote
Old 9th November 2010, 01:07 PM   #4
diyAudio Member
 
Join Date: Nov 2009
Location: Vienna
Thanks, I have a thick carpet. But I will try extra soft material. It's a good suggestion

D.
  Reply With Quote
Old 9th November 2010, 01:40 PM   #5
diyAudio Member
 
simon dart's Avatar
 
Join Date: Mar 2004
Location: Herefordshire
If you are feeling really brave you could look at the Townshend seismic sink principle. This uses a compliant bladder filled with air underneath a large mass to decouple the speaker.

So you could use an inner tube from an electric wheel chair, or similar, underneath your granite. This would give you the best floor decoupling, but you would have to make it toddler proof with a hard mechanical limit. A shallow box topped with the granite, sandwiching the inner tube within a slightly smaller box should do it.
__________________
Bill Bryson: It is no longer permitted to be stupid and slow. You must choose one or the other.
  Reply With Quote
Old 9th November 2010, 01:55 PM   #6
jrenkin is offline jrenkin  United States
diyAudio Member
 
Join Date: Nov 2007
Location: Denver, Colorado
Quote:
Originally Posted by Nikon1975 View Post
Thanks, I have a thick carpet. But I will try extra soft material. It's a good suggestion

D.
Maybe just the thick rug is enough. Put the granite on the rug and the speaker spikes in little divots (or floor protectors) on the granite, The granite should be wide compared with the speaker base or the rug might make it unstable.

This is the simplest. I assume you have been using spikes on the rug, so the rug has been doing nothing and you have been coupling directly to the hard floor below.

Before making fancy contraptions with inner tubes and stuff, I would see if this is good enough.
  Reply With Quote
Old 9th November 2010, 05:15 PM   #7
diyAudio Member
 
StigErik's Avatar
 
Join Date: Feb 2008
I use an inflated bicycle tire tube under my speakers. You wont get much better decoupling than that... the speakers almost "float" like a boat on water.
__________________
dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles
  Reply With Quote
Old 10th November 2010, 12:58 AM   #8
diyAudio Member
 
Join Date: Sep 2009
Location: seoul
i put eggcrate foam sandwiched between my monitors and the stand. this effectively killed the vibration problem i was having with my faux wooden floor, but does make the speakers wobbly to the touch. i doubt that'll go well with your element #4. cork sheet is another material i have available, and hulk glue- the sticky clay used to hang posters to the walls. the last onen would decouple and secure at the same time, but the foam has been good enough for me not to bother switching out.

Last edited by PreSapian; 10th November 2010 at 01:06 AM.
  Reply With Quote
Old 10th November 2010, 01:31 AM   #9
Speakerholic
diyAudio Moderator
 
Cal Weldon's Avatar
 
Join Date: Jan 2004
Location: Near Vancouver
Quote:
Originally Posted by StigErik View Post
I use an inflated bicycle tire tube under my speakers.
I like.
__________________
Next stop: Margaritaville
Some of Cal's stuff | Cal Weldon Consulting
  Reply With Quote
Old 10th November 2010, 11:38 AM   #10
DQ828 is offline DQ828  Australia
diyAudio Member
 
DQ828's Avatar
 
Join Date: Mar 2010
Location: Lake Macquarie, East Coast Australia
Innovation at its best
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Floor standing speaker stand msjd4 Construction Tips 0 3rd January 2010 04:02 AM
DIY 2 way Floor speaker (first build) mebbesen73 Multi-Way 1 22nd November 2009 03:49 AM
floor stander speaker system zackkstar Multi-Way 1 12th June 2006 04:13 PM
HOw close does driver need to be to floor to avoid floor bounce? Kanga Multi-Way 8 24th April 2003 07:09 AM


New To Site? Need Help?

All times are GMT. The time now is 12:00 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2