26 of 29 people found the following review helpful
High frequency ringing,
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This review is from: Cable Mountain Digital Optical ToSlink/Digital Coaxial to RCA Analogue Phono Audio Converter (Accessory)
This product has two jobs: convert digital optical audio to analog audio, and do so with reasonable signal to noise ratio.
After several hours use it begins to make a high frequency ringing sound on the output. I unplugged it and left it and then tried again and this time it produced the ringing straight away. With amp volume set to the normal level you'd listen to audio at, the ringing is completely audible when no other sound is played.