Hi everyone. I have just received my DSD AK4497 yesterday and this is my first post in the thread.
Having assembled the NwAvGuy O2, I was still loving its sound. I build it twice, once with PCB, second with point to point, both with changing battery into 4s Li-ion in series delivering 20+ hours of music.
I love the DSD's SE output to my earphone (uiisii cm5, 16ohm) and headphone (fostex th x00, 32ohm) directly.
However, when used as source to the O2 amp, I feel the O2's output improves considerably, wherr bass is less boomy but has more authority, highs become less piercing and soundstage really opens up. Probably because of the 22ohm output impedance?
I am thinking of possible mods for the 4497, centered on lowering output impedance. So would anyone please shed some light:
1. I have scrapped parts from iBasso DX90 (damaged).. Do you think changing in Zishan's OP275 to the available OPA1611 (4pcs using single to dual opamp adaptor?) improve the sound?
2. As a big fan of the O2, can I "implement" the O2 scheme in this player? I was thinking of adding parallel NJM4556 as buffer, or using NJM2068 as voltage gain SE part.
Please share your comments and many thanks!