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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Another easy to answer question that is above me. XLR vs Ground loop
Another easy to answer question that is above me. XLR vs Ground loop
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Old 8th December 2010, 01:40 PM   #11
AndrewT is online now AndrewT  Scotland
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Join Date: Jul 2004
Location: Scottish Borders
Do not cut the PE of the CDP.
This could be potentially very dangerous !

Check your CDP. Is it double insulated? In which case it does not have a PE connection.

Does the hum only occur when CDP and PC are connected to your system. Do any other combinations of source components cause a milder version of your hum problem?

Could you draw a diagram of the interconnections between your various bits of equipment?

Have you read:
Audio Component Grounding and Interconnection
regards Andrew T.

Last edited by AndrewT; 8th December 2010 at 01:44 PM.
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Old 8th December 2010, 02:00 PM   #12
Bonsai is offline Bonsai  Europe
Account disabled at member's request
Join Date: Jul 2003
Location: Europe
Hello Intefeicio (hell of a name! hope I got it right - LOL)

I'm wondering if you have the mains supply to your gear aligned - by this I mean - are all the neutrals neutral and all the Live's actually lives and you dont' have a situation where one or more have L and N swapped.

Reason: If you have two pieces of gear connected to mains and the L & N's are swapped, its still 'safe' because the transformers provide isolatation from the mains, but, because the mains wiring is out of phase, you get very high common mode voltages appearing across the transformers. It only takes a very small amount of capacitive coupling to introduce all sorts of hum and garbage into a system.

Check it out and let us know if you find anything.

Good luck.
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Old 8th December 2010, 02:27 PM   #13
BobEllis is offline BobEllis  United States
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Location: Upstate NY
Can you use an optical connection for either the PC or CDP? That handily breaks the ground connection, although some have issues with optical's quality.
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