Is a 90hz th for a small fullrange possible? - 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 23rd September 2010, 06:07 PM   #1
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
Default Is a 90hz th for a small fullrange possible?

I am doing a th for bass.

Would it also be possible to do a th for a fullrange?
The basic idea would be like the simple drawing here, a horn radiating from the back of the driver, turning back towards the driver and joining the front in a "new" horn.

This is just a basic idea i got, I do not have any experience with horns really, so i was wondering if it seems possible at all to get a good sounding design. As it seems i would be able to make the rear part to take the mid to upper bass, then the front part to blend in, and do the higher frequencies. Maybe add some high efficiency treble above 5k somewhere.

Edit:
Sorry, i just realized this would be a back loaded horn, with preferably another horn-loading at the front of the driver, but is there any way of calculating if there will be any interference between the two?
Attached Images
File Type: jpg Impossible.JPG (8.6 KB, 205 views)

Last edited by KaffiMann; 23rd September 2010 at 06:11 PM.
  Reply With Quote
Old 24th September 2010, 02:15 PM   #2
IG81 is offline IG81  Canada
diyAudio Member
 
IG81's Avatar
 
Join Date: Feb 2008
Quote:
Originally Posted by KaffiMann View Post
I am doing a th for bass.

Would it also be possible to do a th for a fullrange?
The basic idea would be like the simple drawing here, a horn radiating from the back of the driver, turning back towards the driver and joining the front in a "new" horn.

This is just a basic idea i got, I do not have any experience with horns really, so i was wondering if it seems possible at all to get a good sounding design. As it seems i would be able to make the rear part to take the mid to upper bass, then the front part to blend in, and do the higher frequencies. Maybe add some high efficiency treble above 5k somewhere.

Edit:
Sorry, i just realized this would be a back loaded horn, with preferably another horn-loading at the front of the driver, but is there any way of calculating if there will be any interference between the two?
I had just about the same idea as of late, using two tubes of different diameters. In my case, it was imagined to be more a TL than a horn, which is also what your drawing suggests. I'd imagine that for the 1*wavelenght frequency, you'd have output in phase. For half wavelenght, it'd be at 180deg phase. Did not look at that further yet, but I'm interested in seeing what others have to say.

IG
  Reply With Quote
Old 24th September 2010, 02:44 PM   #3
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
As drawn, the driver's HF response will be choked off by the horn's high air mass and the rest will be comb filtered with its rear radiation which is what one sees in a TH's response. At minimum for it to work then, a BLH's rear filter chamber along with an intricate phase plug is required. This requires a very powerful motor and other driver specs not conducive to point source driver construction though, so a front horn will be required also, making it a compound horn alignment.

FWIW, what I proposed quite awhile back in the huge BIB thread is to use two drivers to create a wide BW hybrid TH, but with no way to sim it AFAIK it's not a high priority project for me.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 25th September 2010, 03:50 AM   #4
diyAudio Member
 
KaffiMann's Avatar
 
Join Date: Sep 2009
I feared the answer was going to be something like that. so the solution still seems to be a 2 or 3 way setup from 80-120hz, unfortunately.

But what about a bass reflex with just an obscenely big port just straight behind the driver (close to OB), and a horn loading at the front? Would that put a hard load on the driver as well?
  Reply With Quote
Old 25th September 2010, 04:17 AM   #5
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Now you've created a crudely stepped TL, so the vent's harmonics will modulate the driver if not damped same as a TL. In this scenario, a higher Qt driver is required to offset having the high acoustic loading dragging it down, otherwise over-damping it. The driver's BW above ~2*pi*Fs will be damped down somewhat also, so typically a driver with a rising response like a Lowther has is required to compensate.

Arguably the best compromise then for drivers with a relatively flat HF response is a max flat impedance TL where Fp = Fs/Qts.

GM
__________________
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
Small fullrange for waveguide loading Defo Full Range 6 25th May 2010 08:14 AM
Best small fullrange for AM radio Foxx510 Full Range 22 18th September 2008 05:47 AM
Zen 9 and 90Hz neil_kaye Pass Labs 3 8th June 2007 08:26 PM
small fullrange driver help Pepe Full Range 6 28th July 2006 04:30 AM
Small fullrange mounted in dash Techz Car Audio 0 20th March 2006 01:07 PM


New To Site? Need Help?

All times are GMT. The time now is 06:02 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