Downfiring sub, how much space underneath? - Page 2 - 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 19th October 2006, 07:52 PM   #11
diyAudio Member
 
Join Date: Jul 2003
Location: Blackstone VA
Ric;

I built the sub in a rather large "endtable" enclosure some time ago and it is truly amazing, however, changes in the configuration of the room force me to downsize the enclosure to a simple 17" cube and place it in a corner. Can't figure out how to send a picture to this blessed forum, but there are shots of it on the Rythmic website.

I had considered downfiring at the start but concerns about distortion from the floor altered my plan. Having listened to the unit for some time I do not believe that this will be an issue and if it is I'll cross that bridge when I get there. Should begin building in a month or so.

Pete
  Reply With Quote
Old 19th October 2006, 08:24 PM   #12
diyAudio Member
 
Join Date: Apr 2001
Location: Leeds, UK
I think I know which one you mean, looks nice

Sounds awesome doesn't it
I'm in debate at the moment as to if I should rebuild my DS12 into the new box or order the 15" driver and knock my house down

Thanks to everyone that replied
  Reply With Quote
Old 19th October 2006, 09:51 PM   #13
diyAudio Member
 
Join Date: Jul 2003
Location: Blackstone VA
Ric:

Go for it!-------"Knock the House!"

Good luck,
Pete
  Reply With Quote
Old 20th October 2006, 08:12 AM   #14
Collo is offline Collo  Australia
diyAudio Member
 
Collo's Avatar
 
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
I'm currently working on some software for sonosubs.

The guidleine I'm intending to use for the gap between the bottom endcap and the floorplate is:

"The air leaving the front of the driver should not encounter a cross-sectional area smaller than the area of the cone itself"

The green area in the attached drawing should be equal or greater than Sd of the driver.

An approximation using nominal diameter is:

An 08 inch driver needs 1-9/16 inch gap
A 10 inch driver needs 1-15/16 inch gap
A 12 inch driver needs 2-3/8 inch gap
A 15 inch driver needs 3 inch gap
An 18 inch driver needs 3-9/16 gap gap

Comments??
Attached Images
File Type: gif breathing-room.gif (693 Bytes, 176 views)
__________________
Ports rule!
  Reply With Quote
Old 20th October 2006, 09:15 AM   #15
diyAudio Member
 
Join Date: Sep 2006
What would happen if that height was doubled or trippled?
  Reply With Quote
Old 20th October 2006, 12:39 PM   #16
Collo is offline Collo  Australia
diyAudio Member
 
Collo's Avatar
 
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
Those figures are what I guess are the absolute minimum spacing to be used.

Going to double or tripple those amounts won't hurt your design apart from the sub being taller than it really needs to be.
__________________
Ports rule!
  Reply With Quote
Old 21st October 2006, 11:36 PM   #17
diyAudio Member
 
Join Date: Nov 2004
I had a similar question last year and emailed rythmikaudio directly with it. He responded immediately with a very thorough answer.
  Reply With Quote
Old 22nd October 2006, 03:26 AM   #18
Collo is offline Collo  Australia
diyAudio Member
 
Collo's Avatar
 
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
and the answer was.....?
__________________
Ports rule!
  Reply With Quote
Old 22nd October 2006, 05:07 AM   #19
diyAudio Member
 
Join Date: Nov 2004
I was interested in mounting the driver in one of his kits downward.
He said it was perfectly ok. It's been over a year since that. I'm 99 percent certain that this is what he said and 75 percent certain that you and I are describing exactly the same driver, enclosure type, linkwitz transform or servo, etc. That's why I'd suggest you email him with your exact question. Only reason why I suggested it to you is to assure you that he responded to me promply and fully. Others on this board have had similar correspondence with him. I forgot his name, I think it was Brian.

Good luck.
  Reply With Quote
Old 22nd October 2006, 11:22 PM   #20
Collo is offline Collo  Australia
diyAudio Member
 
Collo's Avatar
 
Join Date: Nov 2004
Location: Newcastle, Australia
Send a message via MSN to Collo
Will chase up. Thanks
__________________
Ports rule!
  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
downfiring sub formula blue934 Subwoofers 2 8th June 2007 03:26 AM
Titanic MK3 downfiring sub Renron Subwoofers 6 27th March 2007 04:51 PM
Problem with mouting choke underneath chassis? G Tubes / Valves 4 2nd May 2004 11:38 PM
Upfiring or Downfiring? masterp2 Subwoofers 2 11th March 2002 11:58 PM


New To Site? Need Help?

All times are GMT. The time now is 11:45 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