Xonar ST > Symetrix 304
(4 headphone output all leveled to equal loudness, tried each phone one after another)
Round 1
Sennheiser HD 25-1 mkII: Second.
Ultrasone HFI 580: Second
Fischer Audio DBA-02: First
HiFIMAN HE-4: First
Interesting results!
Closed cans showed the second yet an IEM and an open planner magnetic phone showed the first.
Round 2 (Results that showed change based on driver or housing design from round 1 in bold)
Grado SR80: First
HiFIMAN RE-ZERO: Second
AKG K99: First
Custom orthodynamic SFI driver in an ATH-RE70: Second
In this round, the ortho and the IEM showed the socond sample however the semi-open K99 and the fully open SR80 showed the first again. Perhaps the dynamic driver in the RE-ZERO is the cause for change versus the dual BA driver in the DBA-02?