Yes, the headphones out performance of the newer digital amp module is really good. Amping it can provide minor benefit at the expense of carrying around additional equipment. However, you will need a really good amp to reveal those improvements. A mid level portable amps via line out will likely be just a side-step sound quality wise or inferior sounding compared to the player's headphones output. This only applies to IEM though as more difficult to drive phones will see more voltage swing from additional amplification. I have not tested the line out but suspect them to be identical. Remember though, the F is capable of FLAC and you will enjoy the benefit of lossless over lossy formats if you upgrade from the X to F.
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