Reply to thread

Message

<blockquote data-quote="JimCatMP" data-source="post: 886740" data-attributes="member: 103549">Conversely, it output could be too low and the amp in the TV is trying hard to pull the volume up, so low level mains hum on the line is being amplified too - the low frequency would be far less noticeable on headphones.&nbsp;Suggest you try setting TV volume mid way, pick a short bit of film or music with good dynamic range and loop it, changing PC volume from low -&gt; high.&nbsp;&nbsp; &nbsp;If hum persists, could be your lead, poor shielding (used to use similar from PC to AMP, made own cables, so paying attention to shielding is a must<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /> allowing it to pick up mains, also look at routing of cable, it's not close to or even crossing a mains cable at some point?&nbsp;Fingers crossed<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />&nbsp;TTFN - JCMP</blockquote>

[QUOTE="JimCatMP, post: 886740, member: 103549"] Conversely, it output could be too low and the amp in the TV is trying hard to pull the volume up, so low level mains hum on the line is being amplified too - the low frequency would be far less noticeable on headphones. Suggest you try setting TV volume mid way, pick a short bit of film or music with good dynamic range and loop it, changing PC volume from low -> high. If hum persists, could be your lead, poor shielding (used to use similar from PC to AMP, made own cables, so paying attention to shielding is a must:-) allowing it to pick up mains, also look at routing of cable, it's not close to or even crossing a mains cable at some point? Fingers crossed:-) TTFN - JCMP [/QUOTE]

Verification