Sound card RT60

[RobertoDiaz]

Hi everyone, I have measure a sweep directly from the output of my sound card to the input, I own an MAUDIO Fast track Pro. The graphic i send is the RT60 from this measure, beacuse it is a direct measure, It should not have data for reverberation, so my question is: is this kind of data going to alter my real measures of a room? thanks and salutes from Chile.

 

[John Mulcahy]

Generally the decay data for a loopback measurement simply shows the delays of the octave band filters themselves, which can be reduced by, for example, using time reversed filtering. Your delays are very high, probably because you have selected a very high filter order. 6th order is typically used for RT60 data, best not to select a higher order unless you know what you are doing. Whether the filter delays have any significant effect on room measurements depends a lot on the shape of the impulse response, generally the effects are small unless the room has very fast decays.

 

[RobertoDiaz]

Problem solved, thanks