Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture - Page 3 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #21 of 35 Old 10-10-16, 10:15 PM Thread Starter
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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AudiocRaver wrote: View Post
timing loopoback: TRS - TRS
SPL calibration: TRS - TRS
mic: XLR - XLR



It does not matter.



not sure, I'll get back to you
Hi Wayne any news on this

Thanks again
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post #22 of 35 Old 10-14-16, 10:30 PM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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With SPL using DVM do I measure the input 2 or the mic (input 1)?
The mic input is used for SPL measurements. The gain for input 2 is set arbitrarily, so while that input serves a critical purpose for timing measurement, it does not for amplitude measurement.

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Maybe quicker if you could post a photo of the setup (if you can of course)?

Thanks again
I wish it was quicker. Posting photos is never "quicker" with forum software.
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post #23 of 35 Old 10-24-16, 01:23 PM Thread Starter
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

Thanks Wayne

Have you tried jtalden method?

Thanks again
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post #24 of 35 Old 02-24-17, 07:11 AM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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See Calibration Procedure Here.
Your contributions are much appreciated! Thank you for sharing.

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post #25 of 35 Old 02-24-17, 12:17 PM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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Thanks Wayne

Have you tried jtalden method?

Thanks again
I have not. I will say, however, that when John makes a suggestion, you can pretty much take it to the bank for being meaningful, useful and accurate.
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post #26 of 35 Old 02-26-17, 04:44 PM Thread Starter
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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I have not. I will say, however, that when John makes a suggestion, you can pretty much take it to the bank for being meaningful, useful and accurate.
Thanks you

TBH I haven't gone any further with this, yet
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post #27 of 35 Old 02-28-17, 07:57 AM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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Hi Wayne thanks I wondered about the lower frequencies.
Please can you clarify for XLR mics, I have a Steinberg CI-1 pre-soundcard
• For loopback Input 2 to output 2 TRS > TRS or XLR > TRS
• For SPL calibration Input 2 to output 2 TRS > TRS
• For mic cable should be XLR > XLR
Quote:
AudiocRaver wrote: View Post
timing loopoback: TRS - TRS
SPL calibration: TRS - TRS
mic: XLR - XLR

Quote:
Phillips wrote: View Post
For the loopback should the input level (2 or B can't remember) be the same as the mic input or does it not matter?
Quote:
AudiocRaver wrote: View Post
It does not matter.

Quote:
Phillips wrote: View Post
With SPL using DVM do I measure the input 2 or the mic (input 1)?
Quote:
AudiocRaver wrote: View Post
The mic input is used for SPL measurements. The gain for input 2 is set arbitrarily, so while that input serves a critical purpose for timing measurement, it does not for amplitude measurement.
Just wanted to stress that the TRS-TRS connection for loopback timing is crucial for the Focusrite 2i2, which routes phantom power to both XLR inputs simultaneously. AFAIK, The 2i2 will suffer damage if an XLR-TRS connection is used for that purpose, because phantom power will be applied to the output. I learned this the hard way, but it's no longer an issue now that I'm aware.

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post #28 of 35 Old 02-28-17, 08:31 AM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

I didn't realize that the calibration process I suggested could damage the audio interface if the phantom power was not disabled. I think that thread should be deleted as it is very easy to make that mistake. I am surprised I have not made that mistake already.

Will the Staff please remove it? Link
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post #29 of 35 Old 02-28-17, 09:11 AM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

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Just wanted to stress that the TRS-TRS connection for loopback timing is crucial for the Focusrite 2i2, which routes phantom power to both XLR inputs simultaneously. AFAIK, The 2i2 will suffer damage if an XLR-TRS connection is used for that purpose, because phantom power will be applied to the output. I learned this the hard way, but it's no longer an issue now that I'm aware.
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jtalden wrote: View Post
I didn't realize that the calibration process I suggested could damage the audio interface if the phantom power was not disabled. I think that thread should be deleted as it is very easy to make that mistake. I am surprised I have not made that mistake already.

Will the Staff please remove it? Link
Maybe it's just me, but that sounds like your taking responsibility. I believe your suggestion is still valid. The user just needs to use the correct non-XLR cable for the loopback connection. In that case, it shouldn't matter whether or not phantom power is disabled. Just to verify I understand correctly: the loopback connection on one channel is needed for a timing reference during measurements using the microphone on a different channel, correct? So that means phantom power MUST be on, and an XLR cable should NOT be used for the timing reference (at least in the case of the 2i2), correct?

@OP
You may want to avoid the 2i2 if this issue makes you nervous. There are more details here in my thread here

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post #30 of 35 Old 02-28-17, 10:32 AM
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Re: Focusrite Scarlett 2i2 vs Roland UA-55 Quad-Capture

If my 2i2 can be damaged if phantom power on while the loopback cable is connected that is not good. I presume the situation is similar for many other audio interface boxes. While I am willing to take this risk myself, I am not ready to suggest that someone else to use this method. A simple mistake in the process can be too costly.

Last edited by jtalden; 02-28-17 at 10:45 AM.
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