Mine has done that and other issues, I dont think it is a finished product.
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I've go the follong reply from Wadia.
"Thank you for doing business with Wadia! The clicking that you are hearing is a function of the iPod and this question would be better addressed by Apple. I have this function turned off in my iPhone, but it is turned on in my iPod Video. I believe that you will find it in the settings section of your iPod, but again would ask that you check with Apple for the steps to complete this process. I can tell you that the Wadia 170iTransport is not generating this sound. You will most likely be able to find the answer to your question on Apples website. Please let me know if I can answer any other questions regarding the Wadia 170iTransport or any other Wadia products."
I'd then turned every setting off with no luck.
I found that when I pressed the play and stop on the touch screen of the iPod Touch, no clicking sound. The clicking sound only produced when I pressed the STOP and the PLAY button on the remote unit.
I suspect that the clicking sound is not a function of iPod. It is because my DAC has a 4 seconds delay, i.e., when I press the STOP button, music will still on for another 4 seconds. But the clicking sound is on right after I pressed the remote button. I believe that it is some kind of noise which is introduced by the remote receiver circuit.
Or this only happened on iPod Touch.
The IPod Touch settings has no "clicker" option. I'll borrow an IPod Classic for a trial.
I found that the clicking sound is coming from the DAC. I tried to connect the iTransport to both DACs and both of them have the clicking sound.
I turned off the preamp and power amp. I pressed the remote button and found that the clicking sound is coming from the DAC. I then disconnect the digital cable such that the DAC (with the DAC on) and the iTransport is not connected. I pressed the remote button, no clicking sound. I reconnected the digital cable, the clicking exist. The clicking sound is similar to switching a solid state relay on and off. It looks like the iTransport transmits a signal which triggers some of the solid state relay inside the DAC on and off.
I then connected the DAC to a DVD player and then press the Play and Stop buttons of the DVD remote control and no clicking sound were heard.
All the above testing were carried out with the preamp and power amp off.