Calibrating sound card manually by measuring voltage - Home Theater Forum and Systems - HomeTheaterShack.com

 
Thread Tools
post #1 of 5 Old 03-04-18, 09:54 AM Thread Starter
New Member
 
Join Date: Mar 2018
Posts: 2
Calibrating sound card manually by measuring voltage

Hello,

I just finished building a pair of speakers and I wanted to take a look at the spl spectrum. I installed REW, got a USB-mic with calibration file and started measuring.
When measuring the speakers, I noticed a dip at 500Hz, 4000Hz and around 13-14 kHz. I measured different other speakers in different rooms to find out if it was a fault in my speakers' design or with my measuring setup.
Seems like all the measurements get a dip at those frequencies. I suspect that it has something to do with the sound card from my computer (internal soundcard on laptop).

I read that you can not calibrate internal sound cards and that it isn't even necessary to do so. But I have no explanation other then the soundcard being the culprit. Can I manually calibrate the sound card? I could measure the voltage output from the 3.5mm jack? I already installed a program called Equalizer APO that I could use to boost certain frequencies.

What are your ideas on this?

Kind Regards,
Reinhout
reinhout is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 03-04-18, 10:30 AM
HTS Senior Moderator
 
Wayne A. Pflughaupt's Avatar
 
Join Date: Apr 2006
Location: Corpus Christi, Texas
Posts: 9,166
Send a message via Yahoo to Wayne A. Pflughaupt
Re: Calibrating sound card manually by measuring voltage

Quote:
reinhout wrote: View Post
Seems like all the measurements get a dip at those frequencies. I suspect that it has something to do with the sound card from my computer (internal soundcard on laptop).
Hi Reinhout,

This is typical stuff. It’s not the sound card. It’s the room. Take your speakers to a different room and measure them, and the graph won’t look the same.

Regards,
Wayne



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Wayne A. Pflughaupt is offline  
post #3 of 5 Old 03-04-18, 11:27 AM Thread Starter
New Member
 
Join Date: Mar 2018
Posts: 2
Re: Calibrating sound card manually by measuring voltage

Quote:
Wayne A. Pflughaupt wrote: View Post
Hi Reinhout,

This is typical stuff. Itís not the sound card. Itís the room. Take your speakers to a different room and measure them, and the graph wonít look the same.

Regards,
Wayne
Hello Wayne!
That's what I have thought about..I started in the living room measuring my new speakers. Saw the dips so I measured a Sony system in the living room as well. Went on to my desk (different room) and measured a cheap logitech 2.1 system. And yet again the dips are on the same frequencies. That's why I'm coming to you guys. I don't get it. Different speakers, different rooms, same dips at the same frequencies.
reinhout is offline  
 
post #4 of 5 Old 03-04-18, 12:39 PM
HTS Senior Moderator
 
Wayne A. Pflughaupt's Avatar
 
Join Date: Apr 2006
Location: Corpus Christi, Texas
Posts: 9,166
Send a message via Yahoo to Wayne A. Pflughaupt
Re: Calibrating sound card manually by measuring voltage

That is strange indeed! If your soundcard has both an input and an output, you can run the soundcard calibration routine and generate a correction file. If it doesn’t then you’ll have to get an outboard soundcard or interface.

Regards,
Wayne



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.
|
To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

Wayne A. Pflughaupt is offline  
post #5 of 5 Old 03-05-18, 03:19 PM
REW Author
 
JohnM's Avatar
John
 
Join Date: Apr 2006
Location: UK
Posts: 6,705
Re: Calibrating sound card manually by measuring voltage

A minor point first: it is best to select the output device, output, input device and input you are using in the REW soundcard preferences rather than leaving them as default. The default device can change as devices are connected and removed so you can end up not using the interface you thought you were using.

The problem you are seeing is probably because you are using two sweeps. You say you are using a USB microphone, so the input device is not the same as the output device. The two devices will have slightly different clock rates, so when REW tries to align the captured data from each of the two sweeps they will usually not align precisely and cause a kind of comb filtering. Use single sweeps and you should see better results. Multiple sweeps are really only applicable when input and output are on the same soundcard or when using devices that have a common master clock.
JohnM is offline  
Reply

Bookmarks

Tags
calibrating , card , manually , measuring , sound , voltage

Quick Reply
Message:
Options

Register Now




PLEASE COMPLETE ALL REQUIRED FIELDS BELOW... THANKS!

REQUIRED FIELDS ON THIS PAGE
YOU MUST COMPLETE ALL OF THESE

Username
Password
Confirm Password
Email Address
Confirm Email Address
Random Question
Random Question #2




User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
PLEASE READ BELOW PRIOR TO ENTERING AN EMAIL ADDRESS!

ATTENTION!

YOU MUST ACTIVATE YOUR ACCOUNT!

Activation requires you reply to an email we will send you after you register... if you do not reply to this email, you will not be able to view certain areas of the forum or certain images... nor will you be able download software.

AN INVALID EMAIL ADDRESS WILL CAUSE YOUR ACCOUNT TO BE DELETED!

See our banned email list here: Banned Email List

We DO NOT respond to spamcop, boxtrapper and spamblocker emails... please add @hometheatershack DOT com to your whitelist prior to registering or you will get nowhere on your registration.


Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 is not allowed!
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


For the best viewing experience please update your browser to Google Chrome