Circuit simulation using driver impedances. - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

Multi-Way Conventional loudspeakers with crossovers

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 12th July 2002, 03:34 PM   #1
diyAudio Member
 
Join Date: Mar 2002
Location: boston area.
Default Circuit simulation using driver impedances.

Hi all,

I have been trying to do some simulations for some xover circuits using SIMetrix (nice package). First of all, do I put the voice coil inductance and resistance of the driver in series to represent the driver in order to measure the dB (gain) across to get the driver graph giving a frequency sweep from 20Hz to 20kHz?

If this is correct, I have been trying to simulate the xover ckt of the Ariels with this package and I see a graph which starts rolling off at around 100-200Hz for the Vifa driver pair. Something is wrong here and I dont understand. Can someone please shed some light on this issue? ( I am basically plotting voltage versus freq)

The ckt is available on the Ariel website if anyone wants to try it out. http://www.aloha-audio.com/Arieltxt2.html#top

Please help.

thanks
  Reply With Quote
Old 12th July 2002, 04:31 PM   #2
f4ier is offline f4ier  Australia
diyAudio Member
 
f4ier's Avatar
 
Join Date: Sep 2001
Location: Sydney
Quote:
do I put the voice coil inductance and resistance of the driver in series to represent the driver
Yes, but speakers are more complicated than that. Here is a basic driver electrical model and here is a vented-box electro-mechano-acoustical model that you might find interesting.

Filter simulation is best done (and easier) with a set of SPL and impedance measurements of the drivers in their candidate enclosure. If your simulation package is flexible enough to accept measured data, then you're all set. Otherwise, you could use Speaker Workshop (which is free), SoundEasy, LspCAD, LEAP, CALSOD etc.

hope this helps
__________________
Crossover/Subwoofer Simulator
  Reply With Quote
Old 13th July 2002, 02:06 PM   #3
diyAudio Member
 
Join Date: Mar 2002
Location: boston area.
Quote:
Originally posted by f4ier


Yes, but speakers are more complicated than that. Here is a basic driver electrical model and here is a vented-box electro-mechano-acoustical model that you might find interesting.

Filter simulation is best done (and easier) with a set of SPL and impedance measurements of the drivers in their candidate enclosure. If your simulation package is flexible enough to accept measured data, then you're all set. Otherwise, you could use Speaker Workshop (which is free), SoundEasy, LspCAD, LEAP, CALSOD etc.

hope this helps
Thanks, that really helps. I will look at it in more detail. Does that mean that I can use the same model for all drivers except that he various values (mass of cone, compliance etc) are different? ie., should I plug in the values for the specific driver into the ckt.
That would also explain why I was getting the wrong plot.

  Reply With Quote
Old 13th July 2002, 05:10 PM   #4
f4ier is offline f4ier  Australia
diyAudio Member
 
f4ier's Avatar
 
Join Date: Sep 2001
Location: Sydney
You're welcome, but I should note again that modeling filters for mid-high frequency drivers is best done with measured spl and impedance data. You could probably go as far as simulating the impedance to calculate the filtered transfer function, but you really must use measured spl data.

hope this helps and good luck
__________________
Crossover/Subwoofer Simulator
  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
Circuit simulation on Linux just became a bit easier tcpip Solid State 29 10th November 2013 06:55 PM
How big difference of noise between the realistic circuit and pspice simulation? goodnight521 Parts 1 20th June 2008 11:58 AM
linux circuit simulation DoomPixie Everything Else 5 12th June 2006 11:26 PM
Loaded Tank circuit lossess -- PSPICE Simulation xitronics Analog Line Level 23 3rd June 2006 03:30 PM
How does a summing circuit work in terms of input/output impedances? Saurav Everything Else 3 16th May 2003 04:10 PM


New To Site? Need Help?

All times are GMT. The time now is 06:10 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