Impuls Respone Measurement changes over Time

[createartrecords]

Hello Folks

Please can somebody help me.
Why change my ImpulsResponse Result over Time (when i make a new Measurement after mayby 1 Houer), when i have nothing realy changed on the enviroment? The fingerprint is the same buth all reflections are stronger in the Graph (%).
Could it be because the Temperatur of the Air?

Thanks a lot
Ron

 

[John Mulcahy]

Probably best posting some examples in an mdat file.