I own a Zishan Z2 en Z3. I have changed the Opamp for a more lively one and last week I put in a 2600 mAh battery. I have now 10 hours of FLAC and DSD music on a 200 GB Micro SD. I love the Zishan Z3. I use it neutral with no changes in the EQ. I don't understand why you would change the EQ, because it always effects the musicsignal! Fase shifting you know! When you want more bass, then buy a Beats or an other bass-loaded pair of cans. Need more high? Buy a pair of Grado's. I use my Zishan Z3 with the Koss Porta Pro. It's a great set for less than €...

I got the F.Audio S1 yesterday. Today I tried in my 200GB microSD fully filled with music, but het F.Audio could not read it. Out of the S1 I put it back in my Zishad Z3 and he could not file the music op de card anymore. All is gone. Later I tried a 64 GB card filled with music and I found the same problem. The S1 could not see the music op the card and back in my Z3: Gone was my music. So be careful and don't put filled cards of 64 GB and larger in de S1 because you wil loose your music. Further disappointment in comparisson with the Z3 is that...