Cubase Latency Measurement

Hi –

I’m wondering how accurate the latency measure is in Cubase. I’m using an M-Audio Fasttrack Ultra 8r on a project at 128 samples. The Device tab in LE4 shows that as about 5.3 ms in and 5.3 out. Is that an accurate read of the latency or do I need to do other tests to establish latency? I’ve read that most interfaces have hidden buffers that add to the actual latency, not sure about this device. A thread on the M-Audio forum says there are no hidden buffers on this device. How accurate is the Cubase measure with interfaces?

Thanks!

This is not an answer to your question, but does it really matter? If you don’t notice it just roll with it :sunglasses:

If you calculate the latency caused by the pure sample buffer, you´ll se, that with 5 .3 ms there already is some latency added somewhere. Apart from that, cubase can´t measure your interface´s total latency, since it can´t measure the A/D / D/A conversion.

Buffer latency= (input or output buffersize)/samplerate

In your case 128/44100=0.0029 or 2.9ms so as thinkingcap points out the reported latency calculation is taking some other factor/s into consideration.

Thanks for the info guys. When I record at 48,000, 128 samples, 24 bit, Cubase is showing 4.9 ms in 4.9 out, and the pure sample latency should be 2.67 ms, so I’m a little high there too.

As thinkingcap points out there is more latency in the conversions, so if I assume another 1 or 2 ms there, I’m at 11 or 12 ms total latency, which is good I guess – not great, but good. When I run the DPC latency checker with Cubase streaming all is little green bars, no yellow or red. I’ve tweaked and disabled a fair number of things in the system but could do some more to reduce DPC latency, which I assume is the extra latency Cubase is detecting.

Thanks for the help!

Converter latency may or may not be included in the Cubase measurement - it is NOT with my RME interfaces (and I’m doubting that your M-Audio interface is including it either). I can only assume there is some extra buffering going on in your interface.

The DPC latency is a different thing all together and the latency it shows has nothing to do with the latency of your audio interface (other than the fact that a system with good DPC performance should be able to run at lower audio buffer settings without crackling etc.)

There is tool out there called the Centrance Latency Test Utility that will show the true round-trip latency of your system using a loop-back. If you jumper your D/A back to your A/D you will not be able to determine the individual latency of each converter - just the total of the two plus the hardware and software buffering. If your interface has digital I/O you should be able to measure just the interface latency.

Thanks for explaining the difference in DPC latency fishtank, I didn’t have that straight. I’ll check out Centrance.