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Re: Grounding and hum
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Joined: Nov 2006
Posts: 1,333
connoisseur
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connoisseur
Joined: Nov 2006
Posts: 1,333 |
And that memory thing only gets worse. They say it's the first thing to go. Now what was the second?... Scott
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Re: Grounding and hum
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Joined: Jun 2009
Posts: 14
frequent flier
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frequent flier
Joined: Jun 2009
Posts: 14 |
Alan,
Do you have any advice on dealing with HTPCs? Fixing the poor ground on the cable tv line has almost eliminated that as a source, but the HTPC is definitely introducing some noise (EMI/RFI I'm sure) into the system. I was going to switch to an optical connection for the audio, but there is also a small of noise being introduced by the HDMI connection from the HTPC. Not really sure what the options are here aside from trying a whole different HTPC such as a laptop based system that uses an isolated ungrounded power supply and runs via DC only internally...
Anyone have any ideas?
At this point the hum is around the <15db level (I'm guesstimating). It's really really low, but the idea that it should be completely silent is driving me nuts.
Also, I doubt it's actually an issue, but in term of interconnects from pre to amp... Should I be using RG-59 or RG-6 coax interconnects here? Do I really need quad shielded RG-6 to go the 2 ft or so? Right now the interconnects don't seem to be introducing any noise. I can verify that by taking out all the sources form the pre and connecting my iPod to the Aux in... everything is dead silent even with my current RG-59 based interconnects.
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Re: Grounding and hum
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Joined: May 2002
Posts: 10,654
shareholder in the making
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shareholder in the making
Joined: May 2002
Posts: 10,654 |
Foo, on your point about the pre-out connections, RG-59 would nearly always be adequately shielded for a typical home environment, even for considerably longer distances than that. RG-6(which may or may not be more heavily shielded)isn't needed.
-----------------------------------
Enjoy the music, not the equipment.
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Re: Grounding and hum
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Joined: Jan 2002
Posts: 3,270
connoisseur
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connoisseur
Joined: Jan 2002
Posts: 3,270 |
Hi Foo,
I'd agree with JohnK on the RG-59 as being entirely adequate and your not needing RG-6.
Your idea of using a laptop with the isolated power supply may be a solution, but frankly I'm not experienced with HDMI/grounding issues using a home theater PC in a system.
Of course we all want dead-silent noise-free systems, but from a practical point of view, without a lot of tedious trouble-shooting, it's almost impossible to entirely eliminate all noise from a system.
I think the goal of achieveing no audible hum/hiss from your listening area when the volume is advanced to a level that would normallly generate very loud sound with CD or movie playback is a worthy one and achievable without becoming obsessively preoccupied with eliminating all audible hiss/hum with your ear next to the speakers and volume control fully advanced.
Regards,
Alan
Alan Lofft, Axiom Resident Expert (Retired)
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