A Big'un - the Audio Nirvana Super 15 - Page 5 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 August 2012, 08:06 AM   #41
DeonC is offline DeonC  South Africa
diyAudio Member
 
DeonC's Avatar
 
Join Date: May 2002
Location: Kimberley, South-Africa
Not a labrinth, as the verticle strips are made up of damping material, not solid wood. So it is more like a silencer. The strips are made from something like carpet felt. At least that is my understanding of it.

Enjoy,
Deon
__________________
I don't suffer from insanity. I enjoy every minute of it.
Have a look at my favorite thread: Interesting YouTube video clips
  Reply With Quote
Old 15th August 2012, 08:10 AM   #42
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Would need to be a lot longer to be a labyrinth. It would be called a heavily damped U-Frame in today's nomenclature.

Was patented 4 year sbefore the labyrinth.

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 15th August 2012, 08:14 AM   #43
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 DeonC View Post
Not a labrinth, as the verticle strips are made up of damping material, not solid wood. So it is more like a silencer. The strips are made from something like carpet felt. At least that is my understanding of it.
Exactly. Today you'd use Ultratouch (as Gary Pimm does), or fiberglass insulation.

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 15th August 2012, 09:47 AM   #44
Banned
 
Join Date: Nov 2006
Quote:
Originally Posted by freddi View Post
although its motor is small/weak, you could put it into a Karlson enclosure from K15 to K18 size. Coat the front chamber well with varnish, etc. and enjoy.
What are the optimum parameters for the Karlson?
  Reply With Quote
Old 15th August 2012, 07:07 PM   #45
Bare is offline Bare  Canada
diyAudio Member
 
Join Date: Dec 2001
Location: vancouver
Quote:
Originally Posted by Bigun View Post

the floors in my house use wooden i-beams, very stiff (much better than my last house that used regular joists) and lightweight (photo) and much more practical than using thicker and thicker floor boards.
Do know that Tannoy DMT II's Twin 15's, use a Medium sized BR 'Box' comprised of a double layer of 1" MDF stuck together with some rubbery /absorbant adhesive. Box within a box setup. Also have crossed internal Driver bracings.
Seriously heavy but it clearly works.
My listening experiences with these... genuinely Impressed.
The Bass is simply astounding. deep, clear and sharp. (Ferrite Motors= sharp bass) It's more than palpable.
Marvelous midrange and exquisite highs. Very little about those to criticize.. albeit only IF the upstream sources are capable :-).

Find and emulate their constructions? One could do a lot worse for a startpoint. Google is our friend.

Ohh by the way: Truss joists, those things in your Photo.. are BAD for turning floors into drum skins.. true.
Even the 1 1/2" concrete topping typicaly poured over, only partially deals with the problem.
Often New isn't always improved .
  Reply With Quote
Old 15th August 2012, 07:49 PM   #46
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
for a Karlson and fullrange, low moving mass, some on-axis rise and qts not much higher than 0.5 are good - but I've had some speakers such as guitar speakers and vintage fullrange with Q around 0.7->1 play well without boom---- if the speaker has a "bright" character as a direct radiator it will tend to balance well in a Karlson.

A Karlson will make good use of a fullrange speaker's power by controlling in band and below band cone excursion - to me that's more important than small signal extension and allows better performance on complex passages than reflex.
  Reply With Quote
Old 15th August 2012, 09:02 PM   #47
Bigun is offline Bigun  Canada
diyAudio Member
 
Bigun's Avatar
 
Join Date: Jan 2009
Blog Entries: 2
Quote:
Originally Posted by Bare View Post
Do know that Tannoy DMT II's Twin 15's, use a Medium sized BR 'Box' comprised of a double layer of 1" MDF stuck together with some rubbery /absorbant adhesive. Box within a box setup. Also have crossed internal Driver bracings.
Seriously heavy but it clearly works.
My listening experiences with these... genuinely Impressed.
I like this idea Bare. I am now planning to start the build by constructing the 'inner box' from the 11.5 mm Birch Ply. Then after that, I will add a 2nd box over the top, gluing it on top one sheet at a time, using a viscoelastic glue.

The internet brings up a lot of talk about Green Glue for this purpose. I checked out the MSDS for this material - it's nothing more than Latex glue loaded with chalk (a common practice). So I'll be looking for a much more cost effective option of a generic latex glue from a local store.
__________________
"The test of the machine is the satisfaction it gives you. There isn't any other test. If the machine produces tranquility it's right. If it disturbs you it's wrong until either the machine or your mind is changed." Robert M Pirsig.
  Reply With Quote
Old 15th August 2012, 09:25 PM   #48
Banned
 
Join Date: Nov 2006
You can make it yourself
  Reply With Quote
Old 15th August 2012, 09:28 PM   #49
Banned
 
Join Date: Nov 2006
Quote:
Originally Posted by freddi View Post
although its motor is small/weak, you could put it into a Karlson enclosure from K15 to K18 size. Coat the front chamber well with varnish, etc. and enjoy.
Quote:
Originally Posted by freddi View Post
for a Karlson and fullrange, low moving mass, some on-axis rise and qts not much higher than 0.5 are good - but I've had some speakers such as guitar speakers and vintage fullrange with Q around 0.7->1 play well without boom----
Go back to page 1 and look at the spec sheet.
What part of Qts=0.483 is considered weak
  Reply With Quote
Old 15th August 2012, 09:31 PM   #50
Banned
 
Join Date: Nov 2006
Quote:
Originally Posted by Bigun View Post
I like this idea Bare. I am now planning to start the build by constructing the 'inner box' from the 11.5 mm Birch Ply. Then after that, I will add a 2nd box over the top, gluing it on top one sheet at a time, using a viscoelastic glue.

The internet brings up a lot of talk about Green Glue for this purpose. I checked out the MSDS for this material - it's nothing more than Latex glue loaded with chalk (a common practice). So I'll be looking for a much more cost effective option of a generic latex glue from a local store.
I thought you didn't want a heavy box. Hahaha
Go for it.
  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
Audio Nirvana Super 15" cast frame build mikeineugene Full Range 10 16th October 2011 04:36 PM
audio nirvana super 10 or super 12 tonytex Full Range 11 4th September 2011 10:55 PM
Audio Nirvana Super 3 GMark Full Range 8 11th May 2011 06:03 PM
Audio Nirvana super 8 nirvana Full Range 10 19th July 2010 10:07 AM
audio nirvana super 8 cascadeguy Full Range 21 25th March 2007 03:11 PM


New To Site? Need Help?

All times are GMT. The time now is 05:18 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