Yes, it's the buffer and op amp combination, wishing to hear a guidance to create a best synergy with my eqs, if it's still the OPA1611+LME49600 than think i'll take the regular E12 without DIY since the price is 80$ difference. but since my local agent has the stock with old price ($200) i think i'll consider and learn to tinker(i'm such a newbie for this) for the SQ that match my rigs
Hi, I have tried the supplied combinations and the OPA1611 + LME49600 was my clear preference. However swapping the 1611 for TI LME49990's is a significantly better and more enjoyable sound to me on all the headphones I have tried. There is a moderate hit on battery life but the result is well worth it. They are not expensive chips and the resulting sound has had three of my audiophile friends track down E12DIY's to replicate that combination. Two of them already had far more expensive amps. Do you know if your local agent has any gold units left? I am looking for a second one for my daughter and would prefer a different colour to the silver I already have.