Interesting info. Can you tell me a bit more about the REW filter you added? Are you using the Roon Core on a Nucleus or do you have it on a PC or cell?
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The filter was created in REW (free software but you need to buy a USB mic) and then uploaded it into ROON via the DSP settings.
ROON call it a Convolution file.
I have a cheaper copy of a ROON Nucleus which does exactly the same job but you can use a PC for the convolution file too.
Let me know if you need any further help. I have been deep down the rabbit hole snd it is very rewarding after an initially steep learning curve.