Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Requesting the voices of experience on box design
Requesting the voices of experience on box design
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 13th April 2003, 05:40 PM   #1
bostarob is offline bostarob  United States
diyAudio Member
 
Join Date: Apr 2002
Location: New York
Default Requesting the voices of experience on box design

I've got some drivers in a box that I threw together last summer before I went to school. They contain HiVi F8's, and Vifa D25AG domes. The box is too small and ugly, so this summer I want to build another one. I need some advice on driver, port, and bracing placement.

--I haven't a clue where to put bracing, and I'm not sure If the port is in the best place (although it is convenient), or the drivers. How much should I offset the tweeter?
-andy

Here are my current plans:
Attached Images
File Type: jpg speaker plans.jpg (39.0 KB, 385 views)
  Reply With Quote
Old 14th April 2003, 06:13 PM   #2
jbateman is offline jbateman  United States
diyAudio Member
 
Join Date: Oct 2000
Location: The People's Republic of Maryland
If you want to try to optimize the response of the tweeter by offsetting it on the baffle, there is a program called BDS at http://www.pvconsultants.com/audio/frdgroup.htm which can help. I had difficulty using it myself, however.

I like rear ports , unless the speaker has to be placed against a wall. Any port resonances or out-of-phase midrange signals that escape thru the port will be less likely to be heard. As far as bracing, the object is to divide the long panels into smaller, unequally sized panels. So don't put a brace exactly in the middle, or divide a panel into equal thirds.
  Reply With Quote
Old 14th April 2003, 08:00 PM   #3
navin is offline navin  India
diyAudio Member
 
navin's Avatar
 
Join Date: Jan 2002
Location: Mumbai (Bombay), India
Send a message via MSN to navin Send a message via Yahoo to navin
a brace or 2 and you could turn this into a TL
__________________
...still looking for the holy grail.
  Reply With Quote
Old 14th April 2003, 08:27 PM   #4
OMNIFEX is offline OMNIFEX  Jamaica
diyAudio Member
 
OMNIFEX's Avatar
 
Join Date: Mar 2003
Location: Locked Up In The Amp Rack
You have the braces in the most vital part, around the woofer.


Your also using a ducted port, in which, the wood used
for the ports, will brace the box as well.
__________________
OMNIFEX
  Reply With Quote
Old 15th April 2003, 12:58 AM   #5
bostarob is offline bostarob  United States
diyAudio Member
 
Join Date: Apr 2002
Location: New York
Turn it into a TL? How would I do that? I'd have to do a little more research on TL design, but I am considering one of those as a possibility. How would the size of a TL for this driver compare to a vented enclosure (.75 - 2 cu.ft internal)?

also - what is the diameter of a T nut? I don't have any lying around. (#8 and #10)
Thanks
-andy
  Reply With Quote
Old 15th April 2003, 01:19 AM   #6
Ilianh is offline Ilianh  Canada
diyAudio Member
 
Ilianh's Avatar
 
Join Date: Oct 2002
Location: Montreal, Canada
Send a message via MSN to Ilianh
Quote:
If you want to try to optimize the response of the tweeter by offsetting it on the baffle, there is a program called BDS at http://www.pvconsultants.com/audio/frdgroup.htm which can help. I had difficulty using it myself, however.
Sorry, a little off topic here, but I wanted to say that this spreadsheet is awsome for not too complicated designs.

Yes, its not very user friendly, but still better than speaker workshop gui wise .

The only thing that I want to do but cannot is use rounder sides ie. spherical enclosures.

Anyone knows how any online references? hardcore maths are not too much of a problem but I suspect physics will be in the background, ugh.
__________________
Time is the best teacher; unfortunately, it kills all its students
  Reply With Quote
Old 15th April 2003, 01:44 AM   #7
JOE DIRTŪ is offline JOE DIRTŪ  Canada
diyAudio Member
 
JOE DIRTŪ's Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
Ilianh there are pletty of programs out there for speaker design that are really user friendly....almost every site has one...the critical thing is that you know the specs on the drivers and what you are trying to accomplish....I personally would start off with a simple 2 way design...then you can figure out what your lacking...there are so many variables involved that there is never the perfect answer....but I`m sure the knowledgible members here will help you with questions


Cheers!!The DIRTŪ
  Reply With Quote
Old 15th April 2003, 01:49 AM   #8
mikee12345 is offline mikee12345  New Zealand
diyAudio Member
 
mikee12345's Avatar
 
Join Date: Nov 2002
Location: NZ
tlines are approx 1.7metres long for 50hz so not applicable unles for home theatre and u want stands but u can use the height of the thing to keep the speakrs at ear level and get some nice bass also :-D eg 90cm high towers.

well i know that keeping the front face as narrow as possible is good.
rounded off corners are good too.

il have to find my lost links-ive gone too far into subs and forgotn to keep up with the midrange tweeter stuff :-D

i think that 340/2 * the distance between faces gives u the box resonances ( i think! ) i must find that link too lol


  Reply With Quote
Old 15th April 2003, 01:50 AM   #9
bostarob is offline bostarob  United States
diyAudio Member
 
Join Date: Apr 2002
Location: New York
Ohh BTW, Omnifex - I compensated for port volume!
Also, will having the port at the bottom of the enclosure make it sound muddy?
-andy
  Reply With Quote
Old 15th April 2003, 06:14 AM   #10
navin is offline navin  India
diyAudio Member
 
navin's Avatar
 
Join Date: Jan 2002
Location: Mumbai (Bombay), India
Send a message via MSN to navin Send a message via Yahoo to navin
well i dont know what teh volumes would be i did not doany exact calculations besides the length of TL is usually related to your F3 and the area is realted to teh Sd of the woofer you can save a bit of volume by tapering the TL fro say 1.25XSd to 0.75XSd.

if you put a vertical partition between the port vertical and the front baffle and a horzontal partition below the woofer you can make a TL.
__________________
...still looking for the holy grail.
  Reply With Quote

Reply


Requesting the voices of experience on box designHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
requesting information Cisco59nord Parts 3 14th May 2008 12:32 PM
Anone have experience with this fostex FE103 design? gnugear Full Range 11 5th October 2007 07:41 AM
Moray, whomever - anyone w. Karlson design experience to share info? freddi Multi-Way 0 11th March 2007 07:34 PM
Requesting critique on my 2nd PCB design attempt adolphe Parts 1 10th June 2006 04:12 PM
Experience with HIP2101 GateDriver in half-bridge design wanted!! cpmadmann Class D 3 27th October 2005 07:43 AM


New To Site? Need Help?

All times are GMT. The time now is 01:16 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki