Audio Precision for speaker measurements? - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

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 17th June 2013, 10:33 PM   #1
diyAudio Member
 
Join Date: Jun 2004
Location: Sweden
Default Audio Precision for speaker measurements?

Hello all!

I just bought myself an Audio Precision System One Dual Domain with the PCI computer interface card with interconnecting cable and got it running. This is the DSP version. Traded in my HP 8903A and some other instruments.

I started using it and found that it has a MLS Acoustic procedure, which is great! But it seems very basic. I have not found out if there is a way to do a MLSSA style cumulative spectral delay plot. Does anyone know how to do this? I imagine it could be done with some programming. Writing a script to move the start time forward in steps and making a 3D graph from that, but I don't know if the scripting environment supports 3D graphs. But I don't want spend more time programming in Basic than it would take me to write something from scratch in a real language.

I was also looking to do a anti-RIAA EQ to measure a phono stage. But it seems all very DIY and requiring a lot of programming in Basic to get anything done.

Perhaps there is a treasure trove out there with already programmed procedures?

Also I have read about a low noise mod - I am guessing it involves using some higher quality op-amps. Or is it something else? Any hard info on this?

Any pointers eagerly accepted!

Best regards,

P
__________________
Quickly connected, half burned!
  Reply With Quote
Old 18th June 2013, 04:38 PM   #2
diyAudio Member
 
Join Date: Jun 2005
Location: Zürich
Quote:
Originally Posted by Peter Braroe View Post
I was also looking to do a anti-RIAA EQ to measure a phono stage. But it seems all very DIY and requiring a lot of programming in Basic to get anything done.
Check the generator panel and manual, IIRC that's possible (it surely is with the later models).

Samuel
  Reply With Quote
Old 18th June 2013, 05:12 PM   #3
wayne is offline wayne  United States
diyAudio Member
 
Join Date: Jan 2002
Location: Northern California
Riaa is built in. On the gen panel select eq on the pull down and in the directory you should find several both pre emphasis and de emphasis.
__________________
wizards assistant
  Reply With Quote
Old 18th June 2013, 05:45 PM   #4
diyAudio Member
 
Join Date: Jun 2004
Location: Sweden
Thanks!

I found how to do the RIAA pre and de-emphasis. Nice.

I am still working on the MLS acoustic test and how to make a waterfall. I hope I can write a Visual Basic procedure for this inside the APWIN tool. I haven't found any 3D graphing object yet though. I guess another option is to use the Matlab link. And yet another option is to use the external API and write something in C#. I am surprised that there is nothing ready made though.

I am also annoyed by the noisy fan on the front. Has anyone made a temperature regulator for it or replaced it with a quiet version?

I just tried out the procedure to check the impedance curve of a speaker, nice too. All in all I anticipate a lot of enjoyment from using my AP!

Best regards,

Peter
__________________
Quickly connected, half burned!
  Reply With Quote
Old 16th August 2016, 09:44 AM   #5
Eric L is offline Eric L  Taiwan
diyAudio Member
 
Join Date: Jun 2004
Location: Taiwan
Hello, Peter,

Have you found any c# resource about System One (APWIN) programming. I could only find one for AP2700.

Thanks,
Ted

Quote:
Originally Posted by Peter Braroe View Post
Thanks!

I found how to do the RIAA pre and de-emphasis. Nice.

I am still working on the MLS acoustic test and how to make a waterfall. I hope I can write a Visual Basic procedure for this inside the APWIN tool. I haven't found any 3D graphing object yet though. I guess another option is to use the Matlab link. And yet another option is to use the external API and write something in C#. I am surprised that there is nothing ready made though.

I am also annoyed by the noisy fan on the front. Has anyone made a temperature regulator for it or replaced it with a quiet version?

I just tried out the procedure to check the impedance curve of a speaker, nice too. All in all I anticipate a lot of enjoyment from using my AP!

Best regards,

Peter
  Reply With Quote
Old 17th August 2016, 04:49 AM   #6
diyAudio Member
 
Join Date: Feb 2010
Location: Thousand Oaks, CA.
Hi Peter
The AP BASIC (scripting) will do this. Write a single sweep. INC the start time var, sweep again, and up to x Time.
1. Make a TEST. save it
2.Write the procedure. Open test, Append test, run test, INC T,run test X TIMES, save test with new name.
The plot will show the waterfall with different colors.

I do know that my short overview may lead to many other questions. I have about 30 years of AP usage.
Duke

OOPS: Replace it with a new one. DON'T REMOVE IT. There are many HOT SPOTS inside and it would need many thermal sensors to work. The design was made to have a small flow of cool air @ all times. I worked for AP for many years.

Last edited by Audio1Man; 17th August 2016 at 04:55 AM.
  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
Audio Precision WSJ Software Tools 1 11th November 2012 11:10 PM
How to evaluate precision of measurements ? pawelpl Software Tools 10 8th April 2012 12:19 PM
Factors affecting speaker precision? keantoken Multi-Way 27 2nd September 2010 07:34 PM
Audio Precision System 1 mickeymoose Swap Meet 4 23rd April 2010 07:47 PM


New To Site? Need Help?

All times are GMT. The time now is 08:49 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki