Rolling off my nx-otica at ~55hz (3db point) via XLR to amp from my modified schitt fretya + (changed all coupling caps to VCAP ODAM) for 95% of songs it doesn't need it, but when I listen to some really heavy EDM songs with a lot of 20-30hz I will bottom the mid drivers when I am playing quite loud. I just don't want to worry about it. 27k input impedance amp so I used 4 0.1uF VCAP ODAM
I tried sonic caps for fun on the high pass filter, sound was okay but lacked a lot of clarity and punch
Then I tried the miflex pure copper, lot more meat on the bones and better detail across the board
Then I tried VCAP ODAM, without burn in - WOW. FAR better than the above two. VCAP ODAM had everything the pure copper miflex did but added far more details but the biggest thing was the SPACE between notes and THE SOUND STAGE BECAME MASSIVE. I then let 400 hours on them and I about cried at the sound. They sound better with these caps then without them. Using 4 perfectly matched to 0.2% tolerance since doing balanced XLR cables from preamp to amp.
I have my nx-otica using all vcap ODAM bypassed by dueland pure silver 0.01 on the tweeter and the mid cap bulk cap is the sonicap but with a 0.1uF vcap ODAM over the miflex and then another 0.01 dueland pure silver and the detail, musicality, and soundstage is just utter next level real.
I personally wouldn't use a miflex anymore after hearing the VCAP ODAM.