Component pairing

FiiO M21sourcefeedsSennheiser HD 6XXheadphones

Used together in 1 real system

Strong match

FiiO M21 + Sennheiser HD 6XX is a strong match — no compatibility concerns worth flagging.

What the compatibility check found

Headphone Impedance Matching
Pass
✓ Excellent impedance match (damping factor: 9.4)
Physical Connectivity
Couldn't verify
Connector matching does not apply to this pairing