Dipole wall placement - 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 22nd June 2004, 01:38 PM   #1
Rocky is offline Rocky  Norway
diyAudio Member
 
Rocky's Avatar
 
Join Date: Apr 2004
Location: Kongsberg/Oslo
Default Dipole wall placement

I am building dipole speakers with Supravox 215 GMF 8'' midwoofer, with a TAD horn for the highs and upper mids.. In the design, this led to some complications due to the heavy weight of the TAD 4001 drivers.. With some 13 kg I had to use 3 layers of 12mm MDF layered with epoxy to get a reasonably stiff baffle (keep it from bending under the weight of the TADs), and it appears to be strong enough. However, to get the most stability, it would be best if the TAD driver could lean towards the wall (as shown in the attached picture). The baffle on the picture will get «fins» to both sides made out of plexiglass to get the baffle wider, I guess it will be around 60cm to 70cm wide when assembled. The horn will be mounted on the baffle in the big circle in front of the compression driver, poking some 10cm out in the air.

Now, will the ~20-30cm spacing provided by the TAD driver give sufficient space behind the dipole so that it'll work properly? Or will I have to find another way of supporting the baffles further into the room?
Attached Images
File Type: jpg p6220003 copy.jpg (87.1 KB, 293 views)
  Reply With Quote
Old 22nd June 2004, 01:51 PM   #2
Rocky is offline Rocky  Norway
diyAudio Member
 
Rocky's Avatar
 
Join Date: Apr 2004
Location: Kongsberg/Oslo
BTW the newspaper below the baffles in the pic is not a regular sized newspaper.. It's the huge-issh norwegian Aftenposten
  Reply With Quote
Old 22nd June 2004, 02:48 PM   #3
diyAudio Member
 
Join Date: Jan 2004
Location: KC Metro
Default Re: Dipole wall placement

Quote:
Originally posted by Rocky
Now, will the ~20-30cm spacing provided by the TAD driver give sufficient space behind the dipole so that it'll work properly? Or will I have to find another way of supporting the baffles further into the room?

If you have access to Microsoft Excel download a copy of XLBaffle and model performance. Unless your bass driver has a lower Qts than I would guess, given the choice of an OB, 20-30 cm is probably going be a bit close. On the up side, wings may be unnecessary.

XLBaffle Download
  Reply With Quote
Old 22nd June 2004, 02:54 PM   #4
Gregm is offline Gregm  Europe
diyAudio Member
 
Join Date: May 2003
Location: Wherever I leave my hat
Default Hmmmm

I would suggest at least 75cm-1m away from back & side wall (let the Supra breathe a bit).

Maybe a tripod type of support for the Tad would be appropriate?
  Reply With Quote
Old 22nd June 2004, 03:37 PM   #5
Rocky is offline Rocky  Norway
diyAudio Member
 
Rocky's Avatar
 
Join Date: Apr 2004
Location: Kongsberg/Oslo
Thanks for the XLBaffle link.. With regards to wings on the upside, I'll test all possible wings before making some nice looking ones..

Quote:
Maybe a tripod type of support for the Tad would be appropriate?
Explain what kind of device this tripod type support is.. Some sort of metal frame?
  Reply With Quote
Old 22nd June 2004, 04:00 PM   #6
diyAudio Member
 
Join Date: May 2002
Location: Switzerland
Since the lower driver is elevated, why don't you use a triangular shaped piece of wood on the backside, in order to make it stand upright. A little less elegant but giving better stability would be using two of these on each side.

Regards

Charles
  Reply With Quote
Old 22nd June 2004, 04:31 PM   #7
Rocky is offline Rocky  Norway
diyAudio Member
 
Rocky's Avatar
 
Join Date: Apr 2004
Location: Kongsberg/Oslo
Quote:
Originally posted by phase_accurate
Since the lower driver is elevated, why don't you use a triangular shaped piece of wood on the backside, in order to make it stand upright. A little less elegant but giving better stability would be using two of these on each side.

Regards

Charles
Very nice idea. I would definitly go for a single one at the centre of the backside. I can make a big fat one using layered MDF too

Check out my new active cables being constructed for the dipoles: Besides active filtering, they'll provide two gainclone channels of 5 watts!! All battery powered!!
Attached Images
File Type: jpg p6220005.jpg (60.0 KB, 175 views)
  Reply With Quote
Old 22nd June 2004, 10:22 PM   #8
mbon is offline mbon  France
diyAudio Member
 
Join Date: Jun 2004
Location: France
Default Re: Dipole wall placement

Quote:
Originally posted by Rocky
I am building dipole speakers with Supravox 215 GMF 8'' midwoofer, with a TAD horn for the highs and upper mids.. In the design, this led to some complications due to the heavy weight of the TAD 4001 drivers.. With some 13 kg I had to use 3 layers of 12mm MDF layered with epoxy to get a reasonably stiff baffle (keep it from bending under the weight of the TADs), and it appears to be strong enough. However, to get the most stability, it would be best if the TAD driver could lean towards the wall (as shown in the attached picture). The baffle on the picture will get «fins» to both sides made out of plexiglass to get the baffle wider, I guess it will be around 60cm to 70cm wide when assembled. The horn will be mounted on the baffle in the big circle in front of the compression driver, poking some 10cm out in the air.

Now, will the ~20-30cm spacing provided by the TAD driver give sufficient space behind the dipole so that it'll work properly? Or will I have to find another way of supporting the baffles further into the room?
Supravox told me that open baffled needs something like two meters away from back wall to have maximum expression.
I'm very interresting by the 215 RTF, how the 215GMF sounds ? Do you enjoy it ? you can use it from 150 Hz to 5000 Hz in open baffled.
  Reply With Quote
Old 22nd June 2004, 11:10 PM   #9
Rocky is offline Rocky  Norway
diyAudio Member
 
Rocky's Avatar
 
Join Date: Apr 2004
Location: Kongsberg/Oslo
Default Re: Re

Quote:
Originally posted by mbon

Supravox told me that open baffled needs something like two meters away from back wall to have maximum expression.
I'm very interresting by the 215 RTF, how the 215GMF sounds ? Do you enjoy it ? you can use it from 150 Hz to 5000 Hz in open baffled.
Dunno how they sound yet, as they have not yet arrived. Didn't even have a chance to audition any supravox stuff before ordering, so this is kind of casino.. Most reports i've heard gives positive feedback exept some comments about varying build quality.. Specs are great though..

From 150 cycles??? Maybe if mr.Linkwitz designed my baffles Planning on gettting mine down to some 50-60 cycles... Two meters also sounds like an awful lot of space... unneccesarily much space.. Can't really understand why they would say such a thing..
  Reply With Quote
Old 23rd June 2004, 02:32 AM   #10
diyAudio Member
 
Join Date: Jan 2004
Location: KC Metro
Default Re: Re: Re

Quote:
Originally posted by Rocky


Can't really understand why they would say such a thing..
Think of the front wave as + and the backwave as -. Theorectically, when you add the two, you have 0.

Closer you are to the back wall the quicker (the higher the frequency) that you will get to 0.
  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
Designing for on-wall/near-wall speaker placement morbo Multi-Way 4 27th November 2010 04:52 PM
in-wall/on-wall speaker? (axiom w-22 clone?) Scott_fx Multi-Way 0 22nd February 2007 02:08 AM
dipole midrange or subwoofer, distance with wall ? mbon Multi-Way 34 2nd August 2004 06:26 AM
Dipole sub for wall placement ? phase_accurate Subwoofers 1 18th June 2004 06:20 PM
Opinions on wall to wall subwoofer array jmiyake Subwoofers 35 19th July 2003 11:26 PM


New To Site? Need Help?

All times are GMT. The time now is 03:22 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