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Amplifier Intermittent noise in ZD3+ZA3 combo

sbiehe

New member
I have a ZD3 hooked up to a Chromecast audio via TOSLINK and a Sony TV via HDMI. The ZD3 is sending audio to a set of ZA3's in RCA-MONO configuration. The ZA3's power up on a 12V sync signal from the ZD3.
  • Every once in a while, I hear a noise in the left channel only. The sound is attached as an audio recording done on my iPhone.
  • The intervals at which this noise appears, fluctuates a lot. During a test, I recorded 25sesonds, 37s, 65s, 18s, 46s, 63s, 10s, 54s, 64s, 4s, 60s, 58s, 6s, 64s, 50s, 15s and 64s between the appearance of this noise, which was the same every time.
  • The noiselevel is independent of the volume setting on the ZD3.
  • The noise is also there when the 12v trigger cable is unplugged
  • I haven't detected it when I unplug the RCA cable between the ZD3 and the left ZA3.
  • After switching the whole set on and off, the noise doesn't appear until at least one hour later.
Could this suggest that the ZD3 is at fault? Any ideas?
 

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