Originally Posted by x7007
So ZXR has higher output impedance,, isn't that better than 10 ohm only ? I just want to see the big picture.
Lower output impedance usually better but not in all situations. Example some single driver balanced armature earphones are designed to work with higher output impedances. Some earphones output impedance does not matter & others demand very low output impedance so it all depends on the phone but most will do better with low output impedance.
There are other equally important factors relating to sound quality from earphone amplifiers that can make them sound bloated in bass such as coupling capacitor quality especially those going to ground from the negative feedback loop as these control the gain of the amplifier & as such the quality of this cap or lack thereof is amplified by the gain of the amp. A poor quality cap here can & will make the sound bloated as if lacking control even if the output impedance of the amp is low.
Power supply of the amp is also important though may not be noticeable with low quality coupling caps. Replace or get rid of coupling caps & you will start to hear the difference that power supply caps make. These are smaller but equally important differences.
The mods I did to the ZXR addresses these issues with the cards analog output section as it sounded somewhat bloated stock to my ears
Edited by germanium - 2/3/14 at 2:23am