Furniture doubling up as Subwoofer? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 7th December 2008, 07:29 AM   #1
anm is offline anm  India
diyAudio Member
 
Join Date: Nov 2008
Default Furniture doubling up as Subwoofer?

Hi,
I am a newbie in DIY. Actually I mean a newbie who is still at the thought level than actually doing something. I am currently reading before asking specific questions on speaker params etc.
Has anyone thought about (and maybe rejected) putting subwoofer into large furniture like couch, sofa, shoe rack, a storage cabinet, av rack etc? Volume of air available
Two issues I can see upfront

- rattling
- air inside the furniture like shoe rack would not be sealed perfectly.

If I want to put downfiring sub inside my 3 seater sofa, how much above the ground should it be at least? Thoughts on downfiring active driver with a downfiring passive radiator?

regards
  Reply With Quote
Old 7th December 2008, 07:48 AM   #2
diyAudio Member
 
rcavictim's Avatar
 
Join Date: Jun 2004
Location: Next to an open wormhole NW of Toronto
The chances of getting a high quality speaker when modifying a piece of furniture to form a dual function system will be a challenge and is likely to be a less than optimum speaker. If you want to get bass while sitting on your couch have you looked into installing tactile transducers underneath on the wooden frame rails? These create powerful vibrations in whatever they are screwed or bolted to. Basically a motor from a large woofer with no cone. Look up Aura bass shakers as one product available. Parts Express in the USA sells them.

These are an interesting addition to a home theater setup since much of the low frequency energy and rumble in explosions and other sound effects should be felt while the normal speaker system allows the higher harmonic content to be heard.
__________________
"There are more worlds than the one you can hold in your hand." Albert Hosteen, Navajo spiritual elder and code-breaker, X-Files TV Series.
  Reply With Quote
Old 7th December 2008, 08:56 AM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: Toronto, ON, Canada
Could be done, but the acoustic delay should be compensated for.
  Reply With Quote
Old 7th December 2008, 02:29 PM   #4
MaVo is offline MaVo  Germany
diyAudio Member
 
Join Date: Jan 2006
You would still need to build an enclosure, which you integrate into the furniture, since a sub without a box wont do much sound. Seems difficult, but theoretically no problem.
  Reply With Quote
Old 7th December 2008, 03:31 PM   #5
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Not necessarily, just like with any cab alignment you choose the driver to suit, so for a sofa or similar highly damped/lossy cab a low Fs, high Qts OB/IB driver can be made to work well with a bit of EQ.

WRT proper phasing, of course having an adjustable phase control on the sub amp is preferable, but I've found that most of the time wiring a sub in phase with the mains offsets it enough since normally it needs to be reverse phase wired when located around/at the same plane as the mains.

WRT down-firing spacing, it's a bit counter-intuitive in that the larger the 'baffle's' perimeter the less the gap required to push its bandpass tuning well above the sub's desired pass-band, so a large sofa such as my three wide with barely enough room to slide a dust mop under is acoustically large enough even if partially blocked off.

For storage units, etc., good speaker building design/construction applies, so factoring in pi space loading and significant bracing space losses usually applies and of course there's the 'rattle' factor to consider if other than a bookcase loaded with only massive/lossy books, mags, vinyl albums or similar.

Anyway, just some thoughts to ponder.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 7th December 2008, 06:08 PM   #6
HK26147 is offline HK26147  United States
diyAudio Member
 
Join Date: Jan 2008
See AudioXpress 6/06: The Table Tuba
I have not built one but have heard good reports based upon this design. It is a folded horn built as a coffee table.
Vibration is not a problem reportedly, with appropriate bracing.
It occupies 8 cu. ft. - 15.75" H x 29.75" W x 29.75" D.
To me, that seems large as a coffee table, and many times coffee table are placed away from walls. To benefit from boundary loading any sub would be better placed near a wall or corner.
Others have reworked the horn folds into the base of an entertainment center.
Also I have read of individuals who placed horn subs in adjacent utility spaces. The horn mouth played through a opening in the wall, covered by a vent.
  Reply With Quote
Old 7th December 2008, 06:58 PM   #7
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Here is a sketch i did of a dual-push-push (push-push to reduce box vibration) subwoofer/table.

All sorts of variations on this concept are possible... i probably would have built one but i couldn't figure out how to get cabling to it innocuously.

dave
Attached Images
File Type: gif coffee-table-pp-extremis.gif (56.5 KB, 1097 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 7th December 2008, 07:07 PM   #8
HK26147 is offline HK26147  United States
diyAudio Member
 
Join Date: Jan 2008
Interesting,
Just at the idea stage, or do you have dimensions?
And drivers in mind?
Since you have to have an access panel for the drivers.. is there a problem with using it?
Or coming up from below?
  Reply With Quote
Old 7th December 2008, 08:00 PM   #9
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by HK26147
Just at the idea stage, or do you have dimensions?
And drivers in mind?
Since you have to have an access panel for the drivers.. is there a problem with using it?
Or coming up from below?
Just a concept at this point... I have contemplated extremis & SDX7, but if you wanted it to be a true subwoofer, you'd need to move up to a larger driver that goes lower and can move more air.

Access to the drivers and construcability is a problem that would have to be considered. In this respect even trickier are the ones that are push-pull-push-push isobarik. Probably have to treat the multitude of drivers as a removable plug-in unit.

If i build one it will probably look more like this... the floating table top would need to be removable for driver module assembly.

dave
Attached Images
File Type: gif torus-push-pull-push-push-w.gif (41.3 KB, 2046 views)
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 13th December 2008, 08:50 PM   #10
anm is offline anm  India
diyAudio Member
 
Join Date: Nov 2008
Sorry for being away for such a long time. I thought no one replied as I didn't get any mail notifications.
I am just considering getting into DIY, and given that my rooms are not large enough, using furniture crossed my mind. I think I should take some pictures of the furniture and room and post. I am not looking for couch shakers, but subwoofers with decent response.
I am trying to find out drivers available locally (New Delhi) - hope I will get my hands on 12" or 15" drivers - but not very sure what quality they would be. Shipping from the US is going to be very expensive.

regards
  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
DIY Woodworking or Furniture Site? lgreen Multi-Way 0 24th November 2004 04:19 AM
Doubling carlmart Solid State 19 14th July 2004 07:48 AM
Using subwoofer as a piece of furniture... Wingfeather Subwoofers 12 18th March 2004 05:09 PM
subwoofer as furniture flux01 Subwoofers 4 5th August 2003 05:55 PM
subwoofer furniture flux01 Subwoofers 4 2nd August 2003 01:07 PM


New To Site? Need Help?

All times are GMT. The time now is 01:31 PM.


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