tapped transmission line thingo, PVC pipe, will it work? - 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 14th August 2010, 11:29 PM   #1
diyAudio Member
 
Join Date: Feb 2008
Default tapped transmission line thingo, PVC pipe, will it work?

Trying to get the most from some 4inch woofers in a small hatchback.

the resonant frequency of the car is 51Hz.

so, can I make a 51Hz transmission line, with the front exiting at the rear, so, its a loop of PVC pipe, with the two ends meeting about 2.5cm from each other... if that makes sense.

I'll draw up a diagram of what I mean in a minute.

Click the image to open in full size.

Click the image to open in full size.
  Reply With Quote
Old 15th August 2010, 10:59 AM   #2
Volenti is offline Volenti  Australia
diyAudio Member
 
Join Date: Aug 2003
Location: Australia
1. I wouldn't have the 2 openings firing at each other with such a small gap, it will change the response, if you must do it that way, make the gap at least the diameter of the pipe wide.

2.TL/horns ect will drop in frequency when loaded in a vehicle, some of my really big TL's peak 10hz lower in the car than they do outside, so you'll have to keep that in mind.
  Reply With Quote
Old 15th August 2010, 11:12 AM   #3
diyAudio Member
 
Join Date: Feb 2008
Quote:
Originally Posted by Volenti View Post
1. I wouldn't have the 2 openings firing at each other with such a small gap, it will change the response, if you must do it that way, make the gap at least the diameter of the pipe wide.

2.TL/horns ect will drop in frequency when loaded in a vehicle, some of my really big TL's peak 10hz lower in the car than they do outside, so you'll have to keep that in mind.
the 2cm gap means the area of the opening is the same as the area of the pipe.

folded horns that I've tried in the car will normally peak at the vehicles resonant frequency, assuming they play low enough
  Reply With Quote
Old 19th August 2010, 11:26 PM   #4
diyAudio Member
 
Join Date: Feb 2008
I tried this out using some cheapo crappy stock 4inch speakers...

well, it made noise, not as loud as expected, and the woofer fried in about 5 seconds...

so, I'm really not sure if I got the gain I was expecting or not, and I'm guessing the 10 watt speaker didn't like 50+watts...

has anyone played with tapped horns much in car?
  Reply With Quote
Old 20th August 2010, 12:57 AM   #5
diyAudio Member
 
Join Date: Feb 2008
and now I've just realised I had the high pass filter set at 80Hz while trying to play 51hz.. not that it would have made much difference as the woofer smoked anyway
  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
Old, old, PVC pipe design... Ronmeister Multi-Way 6 5th June 2009 11:55 PM
Tapped Horn or Transmission Line mrevie Subwoofers 4 17th May 2009 07:38 PM
Tapering a transmission line...with styrofoam? Would it work? Spasticteapot Multi-Way 4 1st November 2006 07:21 PM
Telescopic PVC exhaust pipe bass transmission lines? VvvvvV Multi-Way 5 5th August 2004 06:57 AM
8" Quartz pipe for Transmission Line speaker MRehorst Swap Meet 0 26th December 2002 11:00 PM


New To Site? Need Help?

All times are GMT. The time now is 11:34 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