Tapped Horn query - 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 6th August 2014, 04:57 AM   #1
diyAudio Member
 
Join Date: Jun 2014
Location: Malaysia
Default Tapped Horn query

I've modeled a 20 Hz TH using a DCS205-4 in Hornresp. It's supposed to have a 50 Hz Low Pass filter as well. I'm not sure what defines a good tapped horn. I've included the parametres and measurements for you experts to have a look at. Please advise if you see something wrong or anything that could be improved.

Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.
  Reply With Quote
Old 6th August 2014, 06:44 AM   #2
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Looks OK except the segments should be parabolic [PAR]. This will increase S3 a bit, though tuning it so low, you give up a lot of gain in the ~27-40 Hz BW compared to my slightly smaller one.

Also, you inputted the driverís [Mms] in the [Mmd] field, which alters the specs a bit since [Mmd] will always be < [Mms], so need to let HR calculate it.

Adding at least a 0.5 ohm [Rg] for wiring loss further refines it a bit.

GM
Attached Files
File Type: txt DCS205-4_TH.txt (943 Bytes, 16 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 6th August 2014, 07:33 AM   #3
diyAudio Member
 
Join Date: Jun 2014
Location: Malaysia
Oh right, didn't realize about the Mmd.

Was going to make it simpler to build by going conical, but I'll try the parametres you posted and see if I can manage. Your isn't slightly smaller, but significantly smaller, I'd like that.

I'm not sure how to treat a parabolic when building it though. Do I break it up into small sections and then follow the flare?

EDIT: I've found a thread that says that if a rectangular csa is used with 2 parallel and 2 non-parallel walls, it will actually be Parabolic and not conical. So if I set it to Parabolic it simulates closer to real life, and I just build it normally like would have building conical (csa increase at a constant rate over the entire length)?

Last edited by FirstOff; 6th August 2014 at 07:46 AM.
  Reply With Quote
Old 6th August 2014, 02:26 PM   #4
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Correct.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 8th August 2014, 03:19 PM   #5
diyAudio Member
 
Join Date: Jun 2014
Location: Malaysia
Good to know.
Another question: If I were to use 2 drivers, one in front of the other along the length of the pipe, how would I simulate that in hornresp?
  Reply With Quote
Old 8th August 2014, 05:07 PM   #6
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
L12 would become the midpoint between the two drivers.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 8th August 2014, 06:17 PM   #7
diyAudio Member
 
Join Date: Jun 2014
Location: Malaysia
So I lengthen L12 and put the drivers in the middle?
Oh wait, did you mean one driver is at the end of L12, and then the other at the start of L34?
  Reply With Quote
Old 8th August 2014, 07:38 PM   #8
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Right, since the driver is ~20.8 cm in diameter [confirm!], then allow a little 'wiggle' room, so make L12 at least 21.5 cm [or more/less if they turn out to be bigger/smaller] and line the edge of the drivers to it, allowing maybe a folded business card's thickness to keep them from physically touching, then use the drivers to mark their mounting holes.

Note that L12 usually needs to be braced and the drivers ideally should be mounted in push-pull and wired to be in-phase.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Last edited by GM; 8th August 2014 at 07:51 PM.
  Reply With Quote
Old 8th August 2014, 09:01 PM   #9
diyAudio Member
 
Join Date: Jun 2014
Location: Malaysia
Just so we're clear about what you mean by push-pull and wired in phase, they are facing opposite directions, correct? Otherwise they'd be pushing and pulling at the same direction unless I reverse the polarity of one of them.

Thanks for these pointers GM, you've been really helpful.
  Reply With Quote
Old 8th August 2014, 09:34 PM   #10
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
You're welcome!

Correct, attached is one example [series wired].

GM
Attached Images
File Type: jpg th-spud.jpg (54.2 KB, 38 views)
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  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
Horn Build using a tapped horn as a frame?? 3GGG Multi-Way 1 17th January 2012 11:52 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 03:02 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