The 99 Classics's sensitivity is 103 dB against the ATH-M50x's 99 dB, its impedance 32Ω against 38Ω, and its driver size 40mm against 45mm. Both share low-frequency extension (15 Hz).
Both turn up in the same documented systems.
The ATH-R30x's impedance is 36Ω against the ATH-M50x's 38Ω, its sensitivity 92 dB against 99 dB, and its driver size 40mm against 45mm. Both share low-frequency extension (15 Hz).
The Spirit Classic's sensitivity is 102 dB against the ATH-M50x's 99 dB, its impedance 32Ω against 38Ω, its driver size 40mm against 45mm, and its high-frequency extension 22 kHz against 28 kHz.
The MDR-7506's sensitivity is 106 dB against the ATH-M50x's 99 dB, its impedance 63Ω against 38Ω, its driver size 40mm against 45mm, and its low-frequency extension 10 Hz against 15 Hz.
Both turn up in the same documented systems.
ATH-M40x
- Sensitivity
- 98 dB vs 99 dB
- Impedance
- 35Ω vs 38Ω
Meze Audio 99 NEO
- Sensitivity
- 103 dB vs 99 dB
- Impedance
- 26Ω vs 38Ω