inputs.text: review ap100 fiio x5 latest new firmware - tested fiio x5 latest firmware recent firmware upgrades enhance products significantly usually case ymmv lot depends hearing like sound no eq tested several pieces music specific hd formats 2496 1444 also using shure 846s also using dapper mac swap music via itunes music alac formatbottom line sound wise sound almost exactly subtle plus differences found ap100 sounded wider bit ehemphasis throws hidizs line features like upsampling dual crystals 128gb w new firmware support 100 bucks cheaper get 64gb card amazon deal overall look specs hidizs nice job hardware cases equivalent better x5s internal componentscons interface better still not good x5 case ap100 cheesy go simple siliconrubber cover ala x5there drawbacks ap100 shures 35 plug 4 pole plug also use thehem iphone phone calls not work ap100 put stereo connection converter 4 pole 3 pole connector get work ap100 address not problehem x5 confirm issue exists use iphone headset typical 4 polethe ap100 controls feel plastic x5 retro apple ipod v1 feel thehemat end day sound important sticking ap100 good value money