Wooden floors/stages and bass absorbtion |
Post Reply |
Author | |
SteveAATW
Young Croc Joined: 04 September 2007 Status: Offline Points: 1173 |
Post Options
Thanks(0)
Posted: 27 July 2008 at 1:33am |
Does anyone know the technical reasons why this occurs and if there's any ways of mitigating it? Reinforcing the floor with more cross members to stiffen it up?
I presume its just due to the nature of the surface, it acts as a damping mass on the sound. But it can be especially pronounced in some places, especially when the speakers are on a stage or step at a height above the main floor. My usual method is put some underlay down onto the wood then drop a load of concrete slabs or blocks down onto that, then bass bins on top. It stops quite a bit of transmitted vibration but the sound still doesn't couple with the floor the way it does on concrete or stone floors. |
|
Bespoke
Old Croc Joined: 20 August 2007 Location: Gone Status: Offline Points: 1886 |
Post Options
Thanks(0)
|
Just put the cabinet(s) stright onto the floor and put more weight on top. Otherwise your just trying to couple cabinets to blocks and the blocks to the floor.
|
|
Timebomb
Old Croc Joined: 11 October 2004 Location: Lancaster Status: Offline Points: 2716 |
Post Options
Thanks(0)
|
As i understand it all materials will have an absorbancy coefficant,
solid stone walls and floors will reflect far more than thin less dence
floors, id guess the wooden stage is absorbing and as bespoke said
putting a heavy well straped stack together should help, much like
extra bracing in subs.
We have a local town hall venue that has an upstairs ball room with a wooden floor and an underpass directly below, they have recently soundproofed this floor and you defanately dont get as much bass as you used to. |
|
James Secker facebook.com/soundgearuk
James@soundgear.co.uk www.soundgear.co.uk |
|
opus jody
Young Croc Joined: 06 June 2006 Location: United Kingdom Status: Offline Points: 1246 |
Post Options
Thanks(0)
|
isn't this more to do with speakers on stage being in free space, and speakers on floor being in half space?
|
|
Improvised Hardware Music http://vimeo.com/user9389813/videos
|
|
_djk_
Old Croc Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
Post Options
Thanks(0)
|
A typical wooden floor acts like 4Pi below 100hz of so. |
|
djk
|
|
Sam York
Registered User Joined: 25 March 2008 Location: United Kingdom Status: Offline Points: 230 |
Post Options
Thanks(0)
|
It's the old principle of conservation of energy, the more of your speaker's movement is going into shaking the floor, the less bass you will hear.
The best plan is probably to figure out the volume of the understage area, port it to tune to 25Hz then mount a couple of drivers firing down into it, super sub bass and less things to load out the van |
|
darkmatter
Old Croc Joined: 26 February 2005 Location: LDN Status: Offline Points: 2425 |
Post Options
Thanks(0)
|
Some floors are practically an ideal bass trap if it wasn't for all the noisy vibrating panels. A non-uniform wooden floor with gaps/loose panels, various sized cavities, possibly with underlay/insulation etc. would be great for damping room modes I'm sure, but I'd rather get a solid concrete box any day :P
|
|
Post Reply | |
Tweet |
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |