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Originally Posted by NelsonVandal
 If you have high impedance phones like HD600/650, please try line out (yes, not headphones out) to your phones and let your ears be the judge. The line out of my iRiver IHP120 betters almost all portable amps I've tried when using HD650. Just try it, it's free. The headphones out of the Iriver and iPod is absolutely crap, so you have to use line out to get that good sound. If you only have a headphone out on your DAP, I doubt an amp will improve the sound much if anything at all. Adding yet another amplifying stage might just lessen the quality. Just listen to music, and not tech-talk, and decide for yourself.
If you have low impedance phones you'll get a bass roll of and too low current supply. The capacitors on the line out of the DAP (I think there's always such) make togehter with the phones a high pass filter High-pass filter - Wikipedia, the free encyclopedia. In the Iriver (and iPod I think) there's a 47 uF capacitor. With 300 Ohm phones the cut off frequency is 11 Hz which is ok, and with 32 Ohm phones it's 211 Hz = no bass. |
