Since today is Sunday I did comparisons to see which iem have the best synergy:
1. For DX50, I have decided that Heir 5.0 and Fitear Parterre to be the best. When paring with 5.0, the soundstage opens up.. real soundstage and not merely airy feeling... However, not so good to listen in noisy environment... Parterre is perfect for classical orchestra type music, today I listen to Mahler No. 3, the detail retrieval capability of this 239 usd DAP is very very good... These iem put you in the best spot of a concert hall..
2. For modded X3, I have concluded that ASG-2 to be good fit... When listening to the same Mahler, the warm signature makes you sit on the front row in the concert hall i.e. more in your face type sound ... also, my personal experience with ASG-2 when using DX50 is that the bass drums or bass overshadow the whole piece and becomes unlistenable... (I know this is against the popular belief in this forum)... I am waiting for trrs cable to pair ASG-2 with 901 , if the synergy is low, I will seriously consider selling this pair... In my books, they are not well rounded iem... Another interesting fact is that a modded X3 and DX50 are around the same in terms of clarity but each has its own sound signature.... (but remember the price I paid for the mod...
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3. For 901, TG334 is the answer. Excellent iem for excellent SQ DAP (SQ only ,the design and look are really bad.... the spin wheel makes you feel like you are driving a bus/truck...this is the amount of effort to find an album to listen to.... I am very easy going in terms of usability, but the side switches and spin wheel just drive me nuts ). When putting DX50 and 901 side by side, it is the poster of "Beauty and the Beast - Chinese DAP edition".