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 26th May 2010, 05:30 PM   #1
diyAudio Member
 
mondogenerator's Avatar
 
Join Date: Sep 2009
Location: City Of Villans
Blog Entries: 1
Default Messing about on Boxsim again...this time with a B200

well i got bored and decided to see what i could get a B200 from visaton to sim like.....needless to say i used um about 4 notches and some crossover stuff that many FR advocates wont like much, but im really quite pleased with the results....

If anyones interested (despite the >10 crossover components), here is a plot or two.

Click the image to open in full size.

Click the image to open in full size.

im not sure i like the peak impedance much though
__________________
Every new piece of knowledge pushes something else out of my brain - Homer.....................Simpson
  Reply With Quote
Old 1st December 2012, 02:19 PM   #2
Kaspari is offline Kaspari  Netherlands
diyAudio Member
 
Kaspari's Avatar
 
Join Date: Dec 2012
Location: Twente
Hello Mondogenerator.

Like you I enjoy playing around with boxsim a lot.

I have to be blunt though and say despite your reasonably flat freq response your impendance plot and directivity plots show some BIG problems. If you want a speaker with a stable crossover behavior then big impendance swings in the crossover region should be avoided at all costs. If you don't the ragged end of your freq response in real life wil cause big audible distortions and you allready have 9dB swings there which point towards big problems in the tweeter region. A small few ohm peak is allowable but your impendance plot is one of the worst I've ever seen, I'm pretty sure it will mess up your real life speaker performance badly (IMHO). I in general always compensate for the tweeter resonance with an LCR circuit and flatten the impendance slope of the woofer with a zobel network. This gives a flat impendance curve with one a few ohms variation at max, apart from the impendance peak of the woofer resonance which can be left untouched.


A smart way to start in boxsim is to just draw a basic parrallel 2nd order crossover with an LCR for the tweeter and a zobel for the woofer. Just fill in some ballpark figures here for impendance, resistance and capacitance and then run the optimiser. Also reversing the polarity of the tweeter can be agood idea in this case, if you get a big dip or peak around the crossover region then reversing the polarity of the tweeter can do wonders. Also if your tweeter has a bigger sensitivity than you woofer an L-pad attenuation will yield very favourable results.


A good article to start with is this one:
http://sound.westhost.com/lr-passive.htm
It sounds difficult at first but it really isn't. If you can't get trough it, quite probably you won't be able to build a good speaker anyways because this art does need a bit of knowledge to yield good results (no offense). Building a speaker isn't as straight forward as many websites and audiophiles will tell you and crossover design is a true art. Using my method in boxsim will make it a lot easier though
  Reply With Quote
Old 1st December 2012, 03:03 PM   #3
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
What are you using as a starting point? I have seen quite a shift in parameters of these (and one would assume FR) over the years i have been treating them.

Many of those components could likely be eliminated by installing phase plugs.

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

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
BoxSim chris661 Software Tools 15 16th July 2010 07:34 AM
messing with a transformer kanifee Chip Amps 23 6th October 2008 02:37 AM
BoxSim definition files for Jordan drivers kubi Full Range 5 21st July 2007 01:27 PM
howdy pups, anyone been messing with this one from dayton? noisenyc Full Range 12 11th December 2004 02:09 PM
Uh Oh- I've been messing with the simulator again! SteveG Solid State 1 12th June 2002 03:20 PM


New To Site? Need Help?

All times are GMT. The time now is 02:30 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