was planning on a voigt pipe, now not so sure. - Page 4 - 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 28th April 2011, 09:50 AM   #31
zman01 is offline zman01  Bangladesh
diyAudio Member
 
Join Date: Feb 2011
Location: Dhaka
Ok Russel K and look forward to your updates.

-Zia
  Reply With Quote
Old 28th April 2011, 04:00 PM   #32
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by planet10 View Post
What is a reverse taper?

A TL is typically tapered* (as per Baily) or straight. A reverse taper would imply a voigt pipe (please note that voigt has no h in it)

dave

*(in reality a taper can go either way, decreasing or increasing taper would make more sense, but only if defined from a particular end, convention is from the closed end, again makes sense only in the context of a quarter wave line)
Well, since I've used this description on a regular basis to describe a TQWT [aka TQWP/TQP/TQWTL] for as long as folks on BB lists/net forums have been interested in such alignments, I'm surprised you would ask this, especially since MJK and some others schooled in electrical and/or acoustical transmission line theory have been at odds with me about my too narrowly defining it on a number of threads, but since you asked.............

A horn is a device that expands in area with increasing length from the closed [throat] end, so a reverse taper is one that contracts with increasing length from it as defined by 'opposite or contrary in position, direction, order, or character' among others since it's a relatively general term.

I normally don't think in scientific [mathematical] terms though and these are mathematical constructs, so looked up 'inverse' and while it has some of the same definitions as 'reverse', it also has mathematical ones which more narrowly defines a TQWT, apparently making it at least a more correct way to define it.

I'm surprised none of the less math challenged folks didn't long ago point this out to me, but will use 'inverse' from now on when describing a TQWT or its mass loaded [vented] ML variants.

Hmm, the only true Voigt pipes I'm aware of are those in his original patent, so only applies to horns and constant [straight] tapered TLs.

Anyway, speaker alignments are defined using electrical equivalent circuits, making TQWT [as you note] either expanding or contracting in area from the closed end, but I have, and will continue to more narrowly define them to keep from explaining what I mean each time or require the 'gentle reader' to have to look it up.

Unfortunately, since many don't agree with me presumably because it's not the most technically correct, it will only reliably apply to my postings AFAIK, so long past time for me to add an 'abbreviations' reference that will hopefully fit in my signature.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 28th April 2011, 04:14 PM   #33
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by planet10 View Post
same area/length as pipe

dave
The shelf vent shown will have a considerably different end correction that will tune lower than the equivalent area/length pipe, though in this design's case it probably isn't enough to matter in-room, but you can check it by recalculating it and convert it to a longer pipe of course:

GM
Attached Images
File Type: jpg PortCorrection.jpg (89.6 KB, 238 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 28th April 2011, 04:31 PM   #34
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
If it's any consolation Greg (not much admittedly), I decided a long time ago that your way of defining various pipe configurations worked for me, so I've used it ever since.

I suppose that means we're both pariahs.
  Reply With Quote
Old 28th April 2011, 06:24 PM   #35
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
Is the principle of operation of the voigt and the metronome and the voigt basicaly the same thing? I must say the V seems a much easier build.
Attached Images
File Type: gif voigt.gif (32.6 KB, 227 views)
  Reply With Quote
Old 28th April 2011, 06:34 PM   #36
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Metronome is a small variation on a mass-loaded voigt. The image you show could be a voigt or an ML-Voigt.

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 28th April 2011, 07:38 PM   #37
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by Scottmoose View Post
I suppose that means we're both pariahs.
Pretty much!

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 29th April 2011, 10:33 AM   #38
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
Quote:
Originally Posted by planet10 View Post
Metronome is a small variation on a mass-loaded voigt. The image you show could be a voigt or an ML-Voigt.

dave
It is the box that was posted on the previous page, I still have to add the feet and port.... was playing around in sketchup.
  Reply With Quote
Old 29th April 2011, 11:44 AM   #39
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
lol @ GM and Scott:

they say 'tailpipe', I say 'exhaust pipe'.

which is more correct?

swings and roundabouts.....
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  Reply With Quote
Old 29th April 2011, 01:00 PM   #40
diyAudio Member
 
digits's Avatar
 
Join Date: Apr 2011
You say traffic light I say robot :O

I added the ports but not the feet yet (lol, kinda don't like them - the feet).
I have to say the square port is lots more apealing, as you are not looking down its throat into the cabinet's tonsils...
Attached Images
File Type: gif voigt2.gif (89.6 KB, 200 views)
  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
voigt pipe new design? zycomatique Full Range 4 20th July 2010 06:00 PM
Voigt pipe as a TQWT Keriwena Multi-Way 5 21st June 2010 10:17 AM
Voigt Pipe is looking for new home mkapszewicz Full Range 9 21st December 2009 02:17 PM
w15cy in a voigt pipe sergiof Multi-Way 16 28th August 2009 11:58 PM
Folded Voigt Pipe Ropie Full Range 18 2nd November 2005 03:31 PM


New To Site? Need Help?

All times are GMT. The time now is 12:28 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