Hello,
I'm experiencing very loud intermittent clipping ('pop' sound) when turning the volume knob on my upgraded C-2C, both with music playing and without.
I received my C-2C in mid-July and used it then with my HD650 (300 Ohm impedance, 103dB/mW sensitivity). I can't recall if I had this problem then. However, since pairing the amp with my AD2000 (40 Ohm impedance, 102dB/mW), the problem has become more distinct.
I emailed Kingwa, and this was his reply:
Quote:
Dear Low,
C2C upgrade version apply the 23 steps switch for volume control, while turn the switch, it will bread the current switch then close the new switch, that time will has a "click" sound from headphone, but I test by Denon D5K and HD650, these "click" sound not loud , I can clear to hear the "click" but can not let me scare.
If your C2C "click" is loud to scare you, I think maybe either this reason, 1, input signal has high DC offset. 2, or your headphone very high sensitive, 3, or the 23 switch fault, 4, turn the volume too slow at every steps.
If you have any problems, let me know please.
Kingwa |
1) I currently have my C-2C paired with the Zero DAC. I tried running the C-2C straight out of my iMac, and while the clicking noise was audible enough (not soft; moderate volume), it was not nearly as loud as when paired with the Zero, which could produce a loud 'pop' noise. However, I'd add that the input signal from the Zero is much higher than that of the iMac (ie. I have to turn the volume knob higher when running out of the iMac to get the same volume).
2) I doubt this is the reason, as the AD2000 has a lower sensitivity than the HD650.
3) Not sure.
4) Doubt so. The clipping occurs regardless of the speed at which the volume knob is turned.
I'm guessing (1) is the most plausible reason, but I thought I'd check if anyone else is experiencing the same issue? Have my headphones been damaged in anyway? They still sound okay to me, for now. If it is my Zero, does it mean it's faulty? What exactly is/causes high DC offset anyway?
Thanks.