New version of Martin King's MathCad Worksheets is coming soon! - Page 3 - 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 15th December 2005, 05:31 PM   #21
jeremym is offline jeremym  Canada
diyAudio Member
 
Join Date: Dec 2004
Location: Toronto, ON
This is very exciting news! I was under the impression that MJK was not willing to release any new software because of intellectual property issues (understandable). I can't wait to play with it-this should prove to be an exceptionally powerful design tool. Thanks Martin!

<damn....this means I am going to have to build *more* speakers.....where will I put them???? When will the madness end?>
  Reply With Quote
Old 15th December 2005, 09:19 PM   #22
SCD is offline SCD  Canada
diyAudio Member
 
Join Date: Nov 2003
Location: 1/2 way up Vancouver Island
Default too many speakers

I am with you on that one jeremym.
I really like the work MJK has done and am keen to send in what ever token amout he feels in reasonable. The work he has done has made me a very true believer in TL designs.
Good for you Martin and thank you very much.
My suggestions have already been expressed bipole, bipole, bipole, bottom exit ports.
__________________
SCD
  Reply With Quote
Old 15th December 2005, 09:25 PM   #23
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Scottmoose
(At this point, I will mention that I'm always a little uneasy about using ports narrower than 3", as I wonder about port-noise. However, other people have sucessfully used them, and this has done the trick as far as the predicted response goes.)
Brings up the sunject of flared ports...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 15th December 2005, 10:19 PM   #24
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
and while requests are being considered, 1/4 space rear mouth horns...

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 15th December 2005, 10:46 PM   #25
Tweeker is offline Tweeker  United States
diyAudio Member
 
Join Date: Dec 2004
Location: Cincinnati, Ohio
Do these sheets cover top firing cabs like Terry Cain's BIB TQWT?

Or is it same issues as bottom ports?
__________________
Be sure your foil hat has a good low impedance ground.
  Reply With Quote
Old 15th December 2005, 11:05 PM   #26
...truth seeker...
diyAudio Member
 
Ed LaFontaine's Avatar
 
Join Date: Feb 2004
Location: where the Appalachians rise from the Blue Grass
Thanks, Martin & scottmoose

I'm working on a simulation of a ML TQWT with the sides being trapezoidal.

I think this is OK (Y/N)?

This also raises the question:

What about sloped baffles? I see the feature for toe-in. I hope I didn't overlook that one. My current application is to "aim" the driver's CL's towards the ear, not to compensate for acoustic centers.

What about height of baffle above floor? Such as for the Totem-style or others on spikes?

I, like scottmoose have combined parameters for 2 drivers to be modelled as one. Is this (an mtm) a valid execise in a ML TQWT?

I would like to ask the location for the "best value" (OK, I'm tight...) for the purchase of Mathcad.

Martin, name your price for your worksheets.

For those like myself who still work with Explorer, I copy and paste parameters and response graph into a 2 X 5 table in a Word.doc. This lets me compare one above the next to judge what progress I make in the simulations. It saves paper and pushing it around until a design matures.

Thanks again
  Reply With Quote
Old 15th December 2005, 11:42 PM   #27
diyAudio Member
 
Scottmoose's Avatar
 
Join Date: Mar 2005
Location: UK
Quote:
Originally posted by Ed Lafontaine

I, like scottmoose have combined parameters for 2 drivers to be modelled as one. Is this (an mtm) a valid execise in a ML TQWT?
Yes. Far as I'm aware. I've never had any problems at least. I paste into Word etc too -I'm scouring ebay for a genuine copy of a late version of MathCad that I can afford too -time I had one.

Dave -good point about flared ports. Not something I've ever used, believe it or not, but could be worth looking into.

No, they don't as yet cover upward-firing enclosures like Terry's BIB box as yet. Similar issues to downward firing ports I believe, though probably easier to resolve as there's less variables to consider. I'm sure Martin can do it though. Regarding Terry's BIB enclosure, it has other issues in modelling I believe, owing to its interaction with the room -it's closer to being a horn in this respect than other ported designs. (I'm still a fan of it though, even if it's the one enclosure type I still have to create using a rule of thumb).


Best
Scott
__________________
Community site www.frugal-horn.com Commercial site www.wodendesign.com
  Reply With Quote
Old 15th December 2005, 11:58 PM   #28
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally posted by Scottmoose
good point about flared ports. Not something I've ever used, believe it or not, but could be worth looking into.
I have a ton of heavily flared elliptical ports i'd love to give away instead of turning into plastic 2x4s.

Click the image to open in full size.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 16th December 2005, 12:34 AM   #29
Jorge is offline Jorge  Brazil
diyAudio Member
 
Join Date: Apr 2001
Location: Brazil
Default MTM

I've built two MTM boxes (a photo of the newer one is in MJK's gallery). One was a conventional TL, the newer is a MLTL.

Both drivers measured equal in close miking up to the cuttof frequency, from there on they started to diverge.

This doesn't means that the equivalent driver placed in the mid point between the real ones is the ideal - just that it's quite acceptable.
  Reply With Quote
Old 16th December 2005, 12:48 AM   #30
ScottG is offline ScottG  United States
diyAudio Member
 
Join Date: Feb 2003
Location: US
awesome!!!

how about anti-phase floor effects (..floor bounce, Allison Effect, etc.)?

(these can often alter BSC curves quite a bit at the top of its range)
__________________
perspective is everything
  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
mathcad worksheets brsanko Full Range 0 15th March 2009 07:53 PM
Question on MJK's mathcad worksheets cs Multi-Way 3 3rd November 2006 05:24 PM
New versions of Martin King's MathCad worksheets Scottmoose Multi-Way 0 14th December 2005 10:05 PM


New To Site? Need Help?

All times are GMT. The time now is 08:10 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