Paraline as first expansions of a tapped horn? - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 22nd October 2012, 01:02 PM   #1
bwaslo is offline bwaslo  United States
diyAudio Member
 
bwaslo's Avatar
 
Join Date: May 2006
Location: Cinciinati, OH
Default Paraline as first expansions of a tapped horn?

I've been thinking of how to configure a tapped horn into a cabinet below a sealed box Synergy horn. I'd like the mouth to be horizontal at top, the width of the cabinet.

It occurs to me that a Paraline might be used here. Have the back of the driver in the mouth, its front facing down into the Paraline. The Paraline Expands and shapes the waterfront to the width of the cabinet. Further expansions snake downwards then up the back and out the mouth.

Any thoughts? Patrick, would this work? Tom?
  Reply With Quote
Old 22nd October 2012, 01:48 PM   #2
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
from what little i know of tapped horns, the cancellation dip is caused by the path length. In your idea i assume this path length would be increased, OR the rest of the expansion required would be shorter. If the length were greater, the dip would be lower, which i guess isnt a good thing. Another doubt i have is that usually the starting CSA is quite large, which again is a limiting factor to how high it could be used. Im no expert in TH design so i wouldnt write your ideas off, but like anything there are trade offs, and the potential problems i mention while worthy of consideration, arent prohibitive.
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  Reply With Quote
Old 22nd October 2012, 05:24 PM   #3
diyAudio Member
 
Join Date: Jan 2008
Quote:
Originally Posted by bwaslo View Post
I've been thinking of how to configure a tapped horn into a cabinet below a sealed box Synergy horn. I'd like the mouth to be horizontal at top, the width of the cabinet.

It occurs to me that a Paraline might be used here.
The Paraline is useful at high frequencies for narrowing dispersion, at lower frequencies it has no wave shaping ability.
A symmetrical fold, as used in the Paraline, reduces the ratio of path length to plywood used by 50%, not a useful feature when trying to maximize a sub's internal volume.

As long as the mouth area conforms to the TH design's expansion rate, the shape makes relatively little difference in the output.

Certain fold patterns, such as in my Keystone sub design, actually benefit from a thin exit shape.

Three examples of TH below are included, as you can see, the mouth shape is quite different in each, and an even more narrow exit could be used if needed for designing to a specific shape.

The Keystone design on the right hand side has nearly identical phase and frequency response to the very different looking DSL TH-118.

Art Welter
Attached Images
File Type: png Exit Shapes.png (524.6 KB, 118 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
jbl gto804 tapped horn/ folded horn 2009thread1 Subwoofers 100 2nd August 2013 12:48 PM
Tapped Horn Feeding A Unity Horn Patrick Bateman Multi-Way 20 4th September 2010 01:27 PM
Can a Tapped Horn have a negative taper within the horn path? BP1Fanatic Subwoofers 6 13th February 2010 06:04 AM
Lab 12 Tapped Horn, Ron's Austin II, T-Horn, CNC Photo Background layertone Subwoofers 15 23rd January 2010 05:12 AM
Ron's Austin II, old T-Horn, Lab12 Tapped horn, CNC Photo Background layertone Full Range 2 23rd December 2009 12:51 AM


New To Site? Need Help?

All times are GMT. The time now is 08:56 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