New speaker impedance tool, SimpeS - Page 2 - diyAudio
Go Back   Home > Forums > Design & Build > Software Tools

Software Tools SPICE, PCB CAD, speaker design and measurement software, calculators

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 4th March 2013, 09:22 PM   #11
xstreme is offline xstreme  Europe
diyAudio Member
 
xstreme's Avatar
 
Join Date: Sep 2010
Location: Italy
Quote:
Originally Posted by tvrgeek View Post
at least it is not written in Java.

The Java compiler is one of the best compiler of the world.

i'm not talking about speed...
__________________
My Audio Freeware Apps : LINK
  Reply With Quote
Old 5th March 2013, 09:24 AM   #12
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
I use Holmimpulse, driving the speaker through a 1k resistor and connecting the speaker voltage as line input. Calibration is by measuring a 10R resistor. You get a very nice graph.
  Reply With Quote
Old 5th March 2013, 10:41 AM   #13
xstreme is offline xstreme  Europe
diyAudio Member
 
xstreme's Avatar
 
Join Date: Sep 2010
Location: Italy
Quote:
Originally Posted by davidsrsb View Post
I use Holmimpulse, driving the speaker through a 1k resistor and connecting the speaker voltage as line input. Calibration is by measuring a 10R resistor. You get a very nice graph.
__________________
My Audio Freeware Apps : LINK
  Reply With Quote
Old 6th March 2013, 08:16 PM   #14
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
I was not getting a nice graph with a 10 Ohm resistor as I used in all my other tools. The values were quite a bit off and the phase was drooping at the high end. I switched to 200 Ohms and it is very close to the values from WT-II.

Tip, go to view and turn on the status bar. You will see it is actually doing something before it starts making noise.
  Reply With Quote
Old 6th March 2013, 08:19 PM   #15
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Quote:
Originally Posted by davidsrsb View Post
I use Holmimpulse, driving the speaker through a 1k resistor and connecting the speaker voltage as line input. Calibration is by measuring a 10R resistor. You get a very nice graph.
They make it hard to donate and get the "save" function as they only take an European money pay thingie. If they did Pay-Pal, they would have my money now. HOLMImpulse is a very good tool.
  Reply With Quote
Old 6th March 2013, 10:00 PM   #16
tvrgeek is offline tvrgeek  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Md
Been here too long. LIMP is where it hard to send a donation. Holm software is free. Their hardware is astronomical.

I am not sure how you do impedance measurements with HOLM, or how you could calculate the T/S parameters, which is why we are fiddling with LIMP and SimpeS.

Be aware, a "feature" of the USB protocol is some timing issues. It is packet based and was never intended for streaming audio. When you are running the test, yo hear ticks when the signal changes. Yo don't on a Firewire and probably don't on a buss sound card. SimpeS does this on my other DACs, so it is inherent to USB-2. It works fine, so don't be alarmed.
  Reply With Quote
Old 7th March 2013, 12:40 AM   #17
diyAudio Member
 
Join Date: Dec 2004
Location: Reston, Virginia
Quote:
Originally Posted by tvrgeek View Post
I was not getting a nice graph with a 10 Ohm resistor as I used in all my other tools. The values were quite a bit off and the phase was drooping at the high end. I switched to 200 Ohms and it is very close to the values from WT-II.
I've been tempted to build up a circuit with the AD5933. It wouldn't have any problems with the source resistance, as it uses a constant current source. However, if you are able to get good enough measurements using a sound card and a simple jig, there probably wouldn't be much demand for the AD5933 board. The chip itself isn't cheap--$27 in single quantities.

http://www.analog.com/static/importe...7846AN_843.pdf
  Reply With Quote
Old 7th March 2013, 01:03 AM   #18
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
I have used both Holms and REW to get impedance curves easily.
But, That is all you get is a curve.
How do you convert the db scale to to impedance?

I think a really cool method could be to use the data of a stereo sweep using Audacity in 24bit/192Khz mode and plot the curves from that using another program of some sort as there doesn't seem to be and import function using SimpleS.
Unless I am missing something.

jer
  Reply With Quote
Old 7th March 2013, 09:33 AM   #19
diyAudio Member
 
Join Date: Dec 2005
Location: Kuala Lumpur
If you turn the drive into a current source with a 1k series resistor and measure the voltage across resistors of 1R, 3R3, 10R and 33R, you should see a flat line at 10 dB higher level each time.
This is your calibration
  Reply With Quote
Old 7th March 2013, 09:51 AM   #20
diyAudio Member
 
Join Date: Feb 2008
Location: Jackson,michigan
Cool,Thanks I will give that a try!!

jer
  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
SET output impedance vs speaker impedance Arno Pf Tubes / Valves 3 20th April 2012 07:37 PM
Cheapest(best) speaker measuring tool mclsound Equipment & Tools 16 7th June 2011 06:14 AM
Great online speaker calculation tool elac310 Multi-Way 2 4th October 2009 11:46 AM
DIY Speaker tool Jimmy DIY Multi-Way 4 18th December 2006 03:12 AM
Tool for producing an LCR network that = a speaker+box? CeramicMan Multi-Way 2 27th May 2004 02:39 AM


New To Site? Need Help?

All times are GMT. The time now is 07:12 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