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MediaPortal 1
MediaPortal 1 Talk
Calling all MP New Zealanders (Both of you!!)
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<blockquote data-quote="littlematt" data-source="post: 877967" data-attributes="member: 25302"><p>Hi all, posting here cos you guys are always helpful!</p><p>I seem to have a ground loop issue thats a bit unusual. Ive just upgraded my system to a more hi-fi set up and noticed an annoying hum coming through the speakers. I suspect its 50hz but is also coming through the tweeters so this doesnt make sense to me. I have an m-audio revolution 5.1 connected to the RCA in of the stereo amp. When I unplug this lead the hum goes away. Went I turn off the HTPC and leave the audio cable plugged in, its still there....Even with the HTPC unplugged from the wall. Unplugging the DVB-T cable makes no difference either. Running a wire from the chassis of the amp to the HTPC chassis works only while the HTPC is off, when its on its worse than ever I can hear digital 'noise' coming through the speakers that wasn't there before. Both the amp and HTPC are plugged into a double wall outlet, so will have a common earth. Both items have three pin plugs. </p><p>I know you can get audio isolators for this problem to run on your audio interconnect but dont want to reduce sound quality or spend hundreds. </p><p>I dont think its a problem with the amp itself because I have two different pioneer amps (A300x and A400) that do the same thing. The level of the hum is independent of the volume level set on the amp, and is audible with the volume right down.</p><p>I read elsewhere that its a good idea to use a volt meter to check the AC volts between pieces of gear + signal cables and gear, will try this tomorrow if my voltmeter does AC, cant remember right now and its pissing down outside so not going to the garage to look <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite12" alt="o_O" title="Er... what? o_O" loading="lazy" data-shortname="o_O" /></p><p>Actually this thing is driving me crazy! Any help/advice much appreciated, hope you are all keeping warm and dry, bring on spring!</p></blockquote><p></p>
[QUOTE="littlematt, post: 877967, member: 25302"] Hi all, posting here cos you guys are always helpful! I seem to have a ground loop issue thats a bit unusual. Ive just upgraded my system to a more hi-fi set up and noticed an annoying hum coming through the speakers. I suspect its 50hz but is also coming through the tweeters so this doesnt make sense to me. I have an m-audio revolution 5.1 connected to the RCA in of the stereo amp. When I unplug this lead the hum goes away. Went I turn off the HTPC and leave the audio cable plugged in, its still there....Even with the HTPC unplugged from the wall. Unplugging the DVB-T cable makes no difference either. Running a wire from the chassis of the amp to the HTPC chassis works only while the HTPC is off, when its on its worse than ever I can hear digital 'noise' coming through the speakers that wasn't there before. Both the amp and HTPC are plugged into a double wall outlet, so will have a common earth. Both items have three pin plugs. I know you can get audio isolators for this problem to run on your audio interconnect but dont want to reduce sound quality or spend hundreds. I dont think its a problem with the amp itself because I have two different pioneer amps (A300x and A400) that do the same thing. The level of the hum is independent of the volume level set on the amp, and is audible with the volume right down. I read elsewhere that its a good idea to use a volt meter to check the AC volts between pieces of gear + signal cables and gear, will try this tomorrow if my voltmeter does AC, cant remember right now and its pissing down outside so not going to the garage to look o_O Actually this thing is driving me crazy! Any help/advice much appreciated, hope you are all keeping warm and dry, bring on spring! [/QUOTE]
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