ATH-M50x sounds majorly different with different sources, DAC/AMP necessary?



Basically, I have a Z-97 A ASUS motherboard and an IPhone 6, which I both use with my M50xs. I feel like the headphones sound very different on the IPhone, the bass is withdrawn, and the vocals are underwhelming. I am wondering if a portable DAC/AMP could help with this.
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