Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Redesigning my cabinets. Thoughts?
Redesigning my cabinets. Thoughts?
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 15th May 2019, 09:11 PM   #21
3wayaddict is online now 3wayaddict  Netherlands
diyAudio Member
 
3wayaddict's Avatar
 
Join Date: Nov 2017
Location: Netherlands
So I got a design with both woofers in the top but still with separate chambers in "L" against each other. Though this means the chamber are quite long from the driver to the end of the chamber. Will this cause standing waves to occur again or won't it be that bad?
__________________
When you do it, do it right. Go all out.
  Reply With Quote
Old 15th May 2019, 09:50 PM   #22
ICG is offline ICG  Germany
diyAudio Member
 
ICG's Avatar
 
Join Date: Jul 2007
Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by 3wayaddict View Post
So I got a design with both woofers in the top but still with separate chambers in "L" against each other. Though this means the chamber are quite long from the driver to the end of the chamber. Will this cause standing waves to occur again or won't it be that bad?
That will still give you standing waves, the frequencies shift though. The lower red 'L' is wrong though, either the holes on the bottom have to be closed or (that's what it looks much more likely) you've drawn the 'L' too short and it one brace more to the volume. But then the most distances are the same distance or at least close to each other, which then gives you standing waves on the same frequency in 2 directions. I don't know the measurements and therefore where the standing waves frequencies will be.

You could also build it with tube absorbers. That would solve it too.

Why don't you use an angled board? You don't have to 3d mill/route that one, to be close to it and file off the edge (in front and back) a bit is enough, you can glue that with polyurethane glue, that will close the gap airtight and it's not visible anyway.
__________________
I had a Déjà Moo - I've seen that BS before!
  Reply With Quote
Old 15th May 2019, 10:12 PM   #23
3wayaddict is online now 3wayaddict  Netherlands
diyAudio Member
 
3wayaddict's Avatar
 
Join Date: Nov 2017
Location: Netherlands
Yeah I drew the bottom L wrong.
What do you mean with the angled board? Where and what for?
__________________
When you do it, do it right. Go all out.
  Reply With Quote
Old 15th May 2019, 10:49 PM   #24
ICG is offline ICG  Germany
diyAudio Member
 
ICG's Avatar
 
Join Date: Jul 2007
Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by 3wayaddict View Post
Yeah I drew the bottom L wrong.
What do you mean with the angled board? Where and what for?
Standing waves occour at parallel surfaces. Avoiding it being parallel..
Attached Images
File Type: png Schermafbeelding 2019-05-15 om 22.14.27-2.png (217.9 KB, 70 views)
__________________
I had a Déjà Moo - I've seen that BS before!
  Reply With Quote
Old 15th May 2019, 10:56 PM   #25
3wayaddict is online now 3wayaddict  Netherlands
diyAudio Member
 
3wayaddict's Avatar
 
Join Date: Nov 2017
Location: Netherlands
Yeah that would be nice. It's gonna be hard to do because of the curved walls though but I'll try my best
__________________
When you do it, do it right. Go all out.
  Reply With Quote
Old 16th May 2019, 12:25 AM   #26
ICG is offline ICG  Germany
diyAudio Member
 
ICG's Avatar
 
Join Date: Jul 2007
Location: I had a Déjà Moo - I've seen that BS before!
Like I said, it doesn't have to be perfect, if you use PU glue, it will fill the gaps, the glue expands, a few mm are no problem.
__________________
I had a Déjà Moo - I've seen that BS before!
  Reply With Quote
Old 16th May 2019, 04:49 AM   #27
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Redesigning my cabinets. Thoughts?
Quote:
… curved sides for extra stiffness ...
The reason a curved wall is stiffer is because you are forcing a flat piece of material into a curve. You do not get this with trans-lam construction — it is good for getting unusual shapes, but i think everything else about this approach sucks.

dave
__________________
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 16th May 2019, 04:54 AM   #28
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Redesigning my cabinets. Thoughts?
If you are doing translam this way:

Click the image to open in full size.

Then these ribs are not braces:

Click the image to open in full size.

Braces would need to run vertically so that the brace contacts each translam piece.

dave
__________________
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 16th May 2019, 05:43 AM   #29
3wayaddict is online now 3wayaddict  Netherlands
diyAudio Member
 
3wayaddict's Avatar
 
Join Date: Nov 2017
Location: Netherlands
That's what I did with the latest version with the vertical brace.
__________________
When you do it, do it right. Go all out.
  Reply With Quote
Old 16th May 2019, 07:00 AM   #30
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Redesigning my cabinets. Thoughts?
You should lose almost all the horizontal ones, because it is translam in the same orientation, they do very little. I’d brace the drivers to the back of the cabinet (spine-like) and then a couple off to the sides.

Now if you were to skin that frame with a flat-panel you could get the stiffness from forcing a curve, and the bracing would be useful.

These use a similar skeleton, then 3 layers of 6mm rubberply and then 9mm. Vacuum bag and a substantial form to make the curves.

Click the image to open in full size.

We used the same sides for these (before veneer):

Click the image to open in full size.

You are showing imaging a bit with tighter radii. Quite doable.

If you want to be over the top this is the way to do it. But a lot more work.

Out there somewhere is a video clip of the large dedicated press used to turn many thin players of wood into a 32mm thick curved plywood shell for the B&W Nautilus 801.

Click the image to open in full size.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote

Reply


Redesigning my cabinets. Thoughts?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Redesigning filter, need help! buestad Multi-Way 25 4th April 2018 01:31 PM
Super Pensil Cabinets with TB W8-1808 Drivers - Thoughts? tlarwa Planet 10 hifi 11 3rd December 2014 08:09 PM
Help redesigning active 3-way baffle DWP Multi-Way 4 10th June 2014 01:23 AM
Looking for thoughts and advice on some old cabinets djmeverett Multi-Way 8 27th June 2012 04:52 AM
Redesigning the Thor planet10 Multi-Way 14 19th August 2003 07:22 AM


New To Site? Need Help?

All times are GMT. The time now is 02:44 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki