Are these mono WAV files? They need to be mono for HQPlayer.
Also, no need to use REW to create convolution file.
You can use HQPlayers built-in parametric EQ.
Just create a .txt file and import into HQPlayer.
I use oratory1990 for my headphones.
Here is an example of the formatting of the .txt file that you need to import to HQP (note this is not LCD-4 so change values for your headphones - it is just example of formatting):
Preamp: -4.5 dB
Filter 1: ON PK Fc 23 Hz Gain -8.50 dB Q 0.200
Filter 2: ON PK Fc 68 Hz Gain 2.10 dB Q 1.600
Filter 3: ON LSQ Fc 105 Hz Gain 5.50 dB Q 0.710
Filter 4: ON PK Fc 1080 Hz Gain -1.20 dB Q 2.000
Filter 5: ON PK Fc 2750 Hz Gain -1.50 dB Q 3.000
Filter 6: ON PK Fc 3350 Hz Gain -1.50 dB Q 6.000
Filter 7: ON PK Fc 4000 Hz Gain 3.00 dB Q 1.400
Filter 8: ON PK Fc 5500 Hz Gain -2.20 dB Q 2.500
Filter 9: ON PK Fc 7300 Hz Gain -2.00 dB Q 5.000
Filter 10: ON HSQ Fc 10000 Hz Gain 2.50 dB Q 0.710
Yea this what I tried initially. Importing a text file or inputting text strings, I tried them both.
But then I found something super wired: if the “enabled” box is checked on the matrix page, there will be dropouts for some DSD tracks, even I left the process box empty.