Bengkia369
1000+ Head-Fier
Sorry if I missed it, but would you put the FW01 in the same league as the FI-BA-SS?
Not even close in my opinion. FW01 sounds veiled compared to FI-BA-SS (both driven with AK240 and sometimes Opus #2 which had sufficient power to drive it) If you are the type going for bass and soundstage then FW01 works well with you. If you are those who listen mainly to female vocals like me, you will find the wide soundstage makes the vocals very messy and lack focus.
I considered for female vocals, my favorite iems for all time are still FI-BA-SS, Ck100pro and Fitear Tg334.
You might notice my favorite iems are all brighter and are well renowned for detail king, the FW01 is on the opposite, it's a warm, bassy sound signature.
With due respect to FW01, it's still a enjoyable and fun iems to listen for certain kind of music and those who like this kind of warm and bassy sound signature.