Measuring Latency, Scarlett 6i6, DiGiGrid, etc.

[Amack]

Thanks! - Same to you!

Originally Posted by mesaone

Good luck.

[guitardom]

Originally Posted by Amack

You do understand that the purpose of this thread was to provide a simple method to measure round trip latency (RTL) - don't you?

Then why do a round and around again trip latency test?

[Amack]

If everything works properly, the first loop should show no latency because of PT's "Playback Engine" latency compensation - which apparently can't be turned off. If that's the case, the second loop shows the (RTL) latency directly. Otherwise it needs to be adjusted to reflect the error in PT's compensation. Thanks for asking !

Originally Posted by guitardom

Then why do a round and around again trip latency test?

[Amack]

I think mesaone did an irrational "OT" on this issue. You might want to see http://duc.avid.com/showpost.php?p=2266607&postcount=25 if you haven't already.

Originally Posted by guitardom

Then why do a round and around again trip latency test?

[mesaone]

You're already set up for it, you just added an extra loopback.

Completely rational, completely on-topic. Let me illustrate:

1. I looking at the PDFs you claim no one looks at, then explained to you how to do a proper loopback test, and explained why the extra loopback in your test was superfluous. That's rational.
2. To refresh your memory, the topic at hand was your latency test. My comment was about the latency test. That's on topic.

Come on, man.

[Amack]

I'm worried about you, are you going to be OK?

Originally Posted by mesaone

Completely rational, completely on-topic. Let me illustrate:

1. I looking at the PDFs you claim no one looks at, then explained to you how to do a proper loopback test, and explained why the extra loopback in your test was superfluous. That's rational.
2. To refresh your memory, the topic at hand was your latency test. My comment was about the latency test. That's on topic.

[mesaone]

Don't be worried. It was just a typo, happens to everyone.

I was looking at the PDFs...

[YYR123]

Originally Posted by guitardom

Then why do a round and around again trip latency test?

Just leave it alone it's not worth the brain power, I thought mesa had a great response.......

He did a double round trip test but just wanted to measure a single trip......

It's best left alone


Cheers

[NewdestinyX]

Originally Posted by Amack

If everything works properly, the first loop should show no latency because of PT's "Playback Engine" latency compensation - which apparently can't be turned off.

Yes it can. Someone told you precisely how to turn it off per channel just a few posts back. Read more carefully, Amack.

I did these tests for years and I assure you only the single loop is necessary to obtain your results.

[Amack]

Consistent with Darryl Ramm’s assertions (http://duc.avid.com/showpost.php?p=2260348&postcount=26), I was unable to disable I/O latency compensation on any channel (all of which indicated 0 delay) either individually or via the "Delay Compensation" (ADC) control. Maybe your tests were with an older/different version of PT (I’m using standard PT12 with a PC). Can you post some of your test results?

Originally Posted by NewdestinyX

Yes it can. Someone told you precisely how to turn it off per channel just a few posts back. Read more carefully, Amack.

I did these tests for years and I assure you only the single loop is necessary to obtain your results.