How can you build a superposition of PEQs? I don't see any theoretical justification for creating using calculations a PEQ that will process the result of the previous PEQ.
In the case of speakers, you can use a microphone and REW to build both the first and subsequent PEQ in a PEQ chain - but in the case of headphones (the first PEQ is UAPP and the second PEQ is the JM20-PRO (= 10+8=18 filters)) it is impossible not only to register the output from UAPP, but even to register the frequency response of the headphones in order to build a PEQ for the first link in the chain - for the UAPP.
Or is it possible to transfer to REW the response of MY specific copy of headphones (AKG K712 PRO over ear) ?
In the case of speakers, you can use a microphone and REW to build both the first and subsequent PEQ in a PEQ chain - but in the case of headphones (the first PEQ is UAPP and the second PEQ is the JM20-PRO (= 10+8=18 filters)) it is impossible not only to register the output from UAPP, but even to register the frequency response of the headphones in order to build a PEQ for the first link in the chain - for the UAPP.
Or is it possible to transfer to REW the response of MY specific copy of headphones (AKG K712 PRO over ear) ?