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  1. zpro

    ER4-S and amp

    Can anyone comment on how well the ER4-S works with amplification? I recently drove them with a stronger source and noticed possible driver "crackling" during demanding segments of different kinds of music... Should a proper DAC/AMP be able to drive these without any sign of stress well above...
  2. zpro

    Quick question, hd650 ipod combo

    Hello,   So tomorrow I will be picking up my first pair of quality headphones, sennheiser hd650's. They have been used lightly (essentially new) and the owner upgraded to hd800's so is selling his hd650's.   I understand these headphones are 300ohm and need proper amplification to...