tqwtl predictions

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I have a problem showing in the sweeps I have made of my horn driver:

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Shared album - lance bartlett - Google Photos

I thought it was a reflection from a wall, but I get the same from both speakers.

Can anyone suggest what is causing the second response? Software is REW for measurement, playback is a Hypex Fusion IIR plate amp. IIR filters have been applied to the signal (a shelf filter)
 
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