voigt pipe and tqwp new concept? - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 8th June 2012, 12:30 PM   #1
diyAudio Member
Join Date: May 2012
Location: London
Default voigt pipe and tqwp new concept?

I have kept some records of designs (and results) and thought an experiment I did a few years ago would interest fellow diyaudio members.
This particular experiment involved a plain straight sided tube about 28" long, about 6'' square, closed at one end, with 2 Monacor spp 110 drivers mounted opposite each other a few inches down from the closed end, one on the front and one on the back, both pointing in the same direction and connected in phase. The back driver had an optimum closed box mounted behind it (probably about 4 litres) stuck on the tube like a square wart. The tube had no sound deadening in it (to maximise the effect)

Note the 160Hz, 400Hz, and 630Hz responses. Above 800Hz the measurements are identical. From 160Hz up the both driven figures are +/- 1dB.

Top line; 1/3rd octave warbled input centred on the following Hz
Measurements taken about 6' in front of front driver

Hz 50 63 80 100 125 160 200 250 320 400 500 630 800

Front driver only 54 63 68 69 71 73 68 68 68 71 68 72 68

Both drivers 54 63 68 70 71 68 66 67 67 66 68 68 67

I would have thought that by choosing the closed box characteristics of the rear driver (sensitivity needs to be the same) that the bass "boost" of a voigt pipe could be used and the frequency of the cancellation in the pipe could be optimised.
  Reply With Quote


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
was planning on a voigt pipe, now not so sure. Russell K Full Range 57 3rd December 2012 11:33 AM
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
Folded Voigt Pipe Ropie Full Range 18 2nd November 2005 03:31 PM
MTM on a Voigt Pipe ? johninCR Full Range 2 8th April 2005 06:20 AM

New To Site? Need Help?

All times are GMT. The time now is 12:21 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2