I have been enjoying this thread since it started. I do not recall if I have posted in it previously. Some of the coupling caps I have tried and still are around in my Supratek Chardonnay linestage are Auricaps, circa 2010, Nothing special. Mundorf SIO's, very smooth and musical. Still use them once in a while. Rike S, nice and musical, don't remember too much about them. V-Cap tftf, not as smooth as the SIO's but very dynamic. Kind of cool sounding. A lot of detail, big sound. Still use them. Got a pair of 0.22 uf V-Cap Cutf's to bypass the tftf's. Did not really work too well. And then it ocurred to me to install these by themselves - all the above caps have a value of .68 -tftf V-Cap- to 1 uf, so .22 is not really optimal in this position. I guessed bass response would not be too strong..... which is the case.... but midrange, smoothness, soundstage and tone and depth qualities trump all others.... frustrating because getting larger value Cutfs would mean spending over $700!! which Zi won't and can't. The linestage output is transformer coupled and these caps are in their input, so it is not a matter of adding a high value resistor to ground after the cap.