I do not have here any of those headphones with bizarre impedance scores to test, but DX3 Pro did sound really good both with my pair of old and trusted “Made in Austria” AKG K701 (62 ohms) and with ATH-M50x (38 ohms) as well. No issues with the output level and no noise or distortion of any kind noticed.
https://www.amazon.com/DX3-Pro-Headphone-Amplifier-Bluetooth/dp/B07KG9P3X3

