Introduction: After I have learned to use RMAA software as a non-bias tools to measure audio gear performance, I have tested my ipod touch 4 and got incredible result. What if I want to further upgrade the portable source? As the ipt 4 is so good (technically), what I can think of is the...

I would like to mod the Teac C-1D cd player. Apart from the opamp mod, what else can I do with this? The cap in the circle may the the output buffer but i am not sure. There is no value on it therefore I am not sure what can I change. I have already got the service manual. Any suggestions are...