Measuring phase & impedance w. PC soundcard?

Ultima Thule · 18th September 2004, 10:13 AM

Hi all,

I have started a new small 2 way loudspeaker project.
The drivers I had around are older Dynaudio D-28 AF and Peerless 130 MF 26/90 SP.

anyhow..
I would like to perform some measurments and measure impedance and phase over the audio range.

It would be nice if I could measure the phase both electrically at the loudspeaker connectors and with a microphone.

Does there exist any SW (preferably freeware) which use the PC soundcard?
I guess such measuring needs some kind of jigg with a resistor and perhaps a small amplifier which I can build myself then...

Any suggests?

daatkins · 18th September 2004, 10:46 AM

Hello,
Speaker Workshop can measure impedance, phase and frequency response using the soundcard in a PC. It’s free, although quite complicated to set-up and use. You can download it here:
http://www.speakerworkshop.com/

A very through manual can be downloaded here (6.6MB):
http://www.audiodiycentral.com/resou...nual%201.0.zip

A jig isn’t required but using one is much better than soldering cables. The Wallin jig is the most popular:
http://www.gti.net/wallin/audio/jig2/jig2.html

An external amplifier will probably be required as almost all sound card do not have internal amplification, other than for driving headphones. I built a Gainclone-type amplifer and a microphone pre-amp into my jig's case to reduce cable clutter - it works very well!

Nice one,
David

John Sheerin · 19th September 2004, 04:21 AM

Hmm, I had no problem getting it Speaker Workshop set up and running once I knew what I was doing. I also have no problem measuring impedance without an external amplifier. I use an SB Audigy2. The hardest part was getting the right settings to make the stupid sound card work in full duplex mode. For measuring acoustic response, I usually use the amplifier I plan to drive the speaker with, so I am really measuring the transfer function of the entire system, not just the loudspeaker.

5th element · 19th September 2004, 10:01 PM

I use speaker workshop and the wallin jig for impedance measurement and to measure xover parts. It works really well.

18th September 2004, 10:13 AM	#1
Ultima Thule diyAudio Member Join Date: Jan 2004 Location: Koskenkorva Land	Measuring phase & impedance w. PC soundcard? Hi all, I have started a new small 2 way loudspeaker project. The drivers I had around are older Dynaudio D-28 AF and Peerless 130 MF 26/90 SP. anyhow.. I would like to perform some measurments and measure impedance and phase over the audio range. It would be nice if I could measure the phase both electrically at the loudspeaker connectors and with a microphone. Does there exist any SW (preferably freeware) which use the PC soundcard? I guess such measuring needs some kind of jigg with a resistor and perhaps a small amplifier which I can build myself then... Any suggests? __________________ "If transistors are blueberries and FETs are strawberries, then tubes must be.. pears" Michael 29th January 2010

19th September 2004, 10:01 PM	#4
5th element diyAudio Member Join Date: Oct 2002 Location: England	I use speaker workshop and the wallin jig for impedance measurement and to measure xover parts. It works really well. __________________ What the hell are you screamin' for? Every five minutes there's a bomb or somethin'! I'm leavin! bzzzz! Droggon Attack!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Soundcard and Mic for measuring.	champ222	Multi-Way	20	17th September 2010 06:46 PM
Measuring Phase Margin	davidallancole	Solid State	4	19th December 2007 06:18 AM
Which soundcard for KX Project and measuring speakers with a Behringer ECM8000?	mazeroth	Multi-Way	1	28th March 2006 08:22 AM
Software for measuring speakers, but also able to calibrate soundcard respons	Nielsio	Multi-Way	3	2nd February 2003 11:38 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

18th September 2004, 10:46 AM	#2
daatkins diyAudio Member Join Date: Aug 2001 Location: Bath, UK	Hello, Speaker Workshop can measure impedance, phase and frequency response using the soundcard in a PC. It’s free, although quite complicated to set-up and use. You can download it here: http://www.speakerworkshop.com/ A very through manual can be downloaded here (6.6MB): http://www.audiodiycentral.com/resou...nual%201.0.zip A jig isn’t required but using one is much better than soldering cables. The Wallin jig is the most popular: http://www.gti.net/wallin/audio/jig2/jig2.html An external amplifier will probably be required as almost all sound card do not have internal amplification, other than for driving headphones. I built a Gainclone-type amplifer and a microphone pre-amp into my jig's case to reduce cable clutter - it works very well! Nice one, David

19th September 2004, 04:21 AM	#3
John Sheerin diyAudio Member Join Date: Nov 2003 Location: Pittsburgh, PA	Hmm, I had no problem getting it Speaker Workshop set up and running once I knew what I was doing. I also have no problem measuring impedance without an external amplifier. I use an SB Audigy2. The hardest part was getting the right settings to make the stupid sound card work in full duplex mode. For measuring acoustic response, I usually use the amplifier I plan to drive the speaker with, so I am really measuring the transfer function of the entire system, not just the loudspeaker.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)