Home Theater Forum and Systems - HomeTheaterShack.com - Reply to Topic

Thread: Calibration of my sound card Tascam US-2x2 Reply to Thread
Title:
Message:
Post Icons
You may choose an icon for your message from the following list:
 

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










  Additional Options
Miscellaneous Options

  Topic Review (Newest First)
07-21-18 10:31 AM
satbox
Re: Calibration of my sound card Tascam US-2x2

Thank you Wayne, now it's crystal clear!
07-21-18 10:00 AM
Wayne A. Pflughaupt
Re: Calibration of my sound card Tascam US-2x2

Quote:
satbox wrote: View Post
So, when I calibrate the sound card, I have to set the switch "MIC/LINE INST" of the input to "INST"?
Yes.

Quote:
satbox wrote: View Post
Sorry for my ignorance but, in the us-2x2 specifications, it is specified that the line out is "6.3mm(1/4")TRS-jack(T:HOT, R:COLD, S:GND), BALANCED". So, why to use a TS to dual rca Y cable and not a TRS to dual rca Y cable?
Because it’s not made for this purpose. The TRS to dual RCA is a splitter for stereo headphones, where T = Left side [+], and R = Right side [+] and S = signal [-].

The signal coming out of the TASCAM is not stereo. It’s balanced mono, where T = [+]; R = [-]; and S = [ground]. ( “HOT” and “COLD” is the same thing as signal [+] and [-] ).

Perhaps some pictures will better illustrate, but first you have to understand the difference between a balanced and unbalanced signal.

To simply things for the purpose of this discussion, with an unbalanced signal, the [-] is carried by the shield connection. This is why cables and connectors carrying unbalanced signals have two connection points (TS).

By contrast, a balanced signal separates the signal [-] from the cable’s shield (or ground) connection. This is why cables and connectors carrying balanced signals have three connection points (TRS).

To illustrate, the picture below is a female TRS jack, identical in function to what’s in your TASCAM. When a male TRS plug is inserted into the jack, the two tabs make contact with the plug’s Tip and Ring. The Sleeve connection is made through the body of the jack. (Side note: A female TS jack only has one of the tabs.)




Here’s a picture of the male plug inserted into the female jack, showing the tabs (although this one is TS and only has one tab).




So: What happens, signal-wise, when the male TRS plug is inserted into the female TRS jack? In the picture below, the purple represents the TRS jack. The tabs send the signal [+] to the plug’s Tip, and the signal [-]to the plug’s Ring. The signal [-] is fully isolated from the Sleeve connection (to which the shield of the cable will be connected). So we have a balanced signal path.




Well and good. So what happens when we insert a male TS plug into that same TRS jack? As you can see below, the tab with the signal [-] is now connected to the Sleeve. Thus we now have an unbalanced signal, where the Tip carries the signal [+], and the shield carries the signal [-]. So basically, any balanced TRS jack can be converted to an unbalanced signal with a TS plug.




Now: What do we get using your TRS to dual RCA headphone splitter? As the picture below shows, the right side of the RCA splitter will get the Ring [-] signal, and the left side will get the Tip [+] signal. So plugging the two RCAs into your stereo, you’ll get no sound, because neither side is getting both the [+] and [-] needed to complete the signal.




Bottom line, the cable you want for this application is a TS to dual RCA splitter like this.

Regards,
Wayne
07-20-18 02:28 AM
satbox
Re: Calibration of my sound card Tascam US-2x2

Thank you for your help!!!

Quote:
wayne a. Pflughaupt wrote: View Post
most usb devices these days have ruler-flat frequency response, so no soundcard calibration is required, unless you need it for a timing reference. If thatís the case, just use a ts (mono) 1/4" cable between the input and output. The trs cable youíre considering wonít work because the 1/4" input is unbalanced. Neither will the xlr to trs, because itís typically not a good idea to loopback via a mic preamp.
So, when I calibrate the sound card, I have to set the switch "MIC/LINE INST" of the input to "INST"?


Quote:
the tascamís outputs are balanced mono, not stereo, so donít use that cable. You want a ts 1/4Ē to dual rca cable. It doesnít matter if you use #1 or #2.
Sorry for my ignorance but, in the us-2x2 specifications, it is specified that the line out is "6.3mm(1/4")TRS-jack(T:HOT, R:COLD, S:GND), BALANCED". So, why to use a TS to dual rca Y cable and not a TRS to dual rca Y cable?

Thank you!
07-19-18 05:12 PM
Wayne A. Pflughaupt
Re: Calibration of my sound card Tascam US-2x2

Most USB devices these days have ruler-flat frequency response, so no soundcard calibration is required, unless you need it for a timing reference. If that’s the case, just use a TS (mono) 1/4" cable between the input and output. The TRS cable you’re considering won’t work because the 1/4" input is unbalanced. Neither will the XLR to TRS, because it’s typically not a good idea to loopback via a mic preamp.


Quote:
What I understand is that I have to connect the LINE OUT 1 (or LINE OUT 2?) of the sound card to the line in R and L of my amplifier. I thought I would use one cable like this: 6.3mm(1/4") stereo TRS-jack to 2xRCA. Is it correct?
The TASCAM’s outputs are balanced mono, not stereo, so don’t use that cable. You want a TS 1/4” to dual RCA cable. It doesn’t matter if you use #1 or #2.

Hope this helps.

Regards,
Wayne
07-19-18 04:58 AM
satbox
Calibration of my sound card Tascam US-2x2

Hello,

I'm new REW user and want to use a Tascam US-2x2 sound card (connected to my MacBook pro via USB). I need some advice/confirmation regarding cables...

-Loopback cable in order to calibrate the sound card: what I understand is that I have to connect the IN 1 to the LINE OUT 1 (or LINE OUT 2?). LINE OUT of this device is balanced. I thought I would use one cable like this: 6.3mm(1/4") stereo TRS-jack to 6.3mm(1/4") stereo TRS-jack OR XLR to 6.3mm(1/4") stereo TRS-jack. Is it correct? What is the best? (after, during measurements, my mic will be connect to IN 1 via an XLR)

-Connection to my amp: during measurements, the sound card will be connected to my amplifier (standard hi-fi integrated amplifier). What I understand is that I have to connect the LINE OUT 1 (or LINE OUT 2?) of the sound card to the line in R and L of my amplifier. I thought I would use one cable like this: 6.3mm(1/4") stereo TRS-jack to 2xRCA. Is it correct?

Thank you for your help!

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!

 


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