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Hi,

I think I found a bug (or I'm not measuring correctly...)
When I measure with 2 sweeps and looking at the Impulse response graph it seems that the second measurement is delayed by 0.23ms, causing two spikes everywhere instead of one. When using 1 sweep I don't see this behavior.
Attached is an image of the graph.
etc_ortal.jpg
 

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That is caused by the computer's audio path failing to maintain alignment between successive sweeps, it can happen if the input and output paths are operating at different sample rates or if the OS is resampling to convert between the rate REW is set to and the rate the card is operating at. If that happens then you need to either track down where the rate conversion is happening and eliminate it or use single sweeps - single sweeps are broadly preferable anyway, better using one long sweep than multiple shorter sweeps.
 
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