just to know (noob question again) why a l9 line out will give better audio signal than a normal audio jack plugged from the ipod/iphone to the amp ? i would use that only on iphone because my ipod is a shuffle so if it doesen't give a hell of improvement against a good quality audio jack i would rather go for the audio jack instead.
yeah, it's a never ending choice... k167 vs dt770 80ohm vs beyer cop vs hfi 580
for iem, well... the best bang for the buck with a budget limit of 25-30 euro if it's worth it against the sony ex10lp (10 euro)
L9 is a LOD cable for iDevices with 30Pin. It allows us to bypass iPod internal amp. If you are using 3.5mm to 3.5mm jack, we call it "double amping" that will increase distortion.
As for IEM, you can try Moshi Moonrock! :)