Lowrider57 said:
I did some tests on the amp. With my multi meter, measuring from the male ground pin on the Sunfire amp to the metal chassis of the amp, I could not get a reading of resistance. The meter indicated “L.”
"L" ? What does the meter indicate when both test probes are touched against one another? "L"? There in as "short" or "000.0", continuity?
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Lowrider57 Said:
Bypassing all power conditioning, I plugged the amp 3-prong into the wall, and plugged the stock preamp 3-prong cable into the wall; result was 60hz hum. I used Belden Interconnects instead of audiophile brands.
To be 100% clear here, you did say the ground loop hum is being caused when only the preamp amp and amp are connected together by ICs. Is that correct? The CDP is not in the ground loop, possibly being the culprit causing the ground loop hum, correct?
To be 100% sure that is the case, disconnect the CDP ICs from the preamp and check for ground loop hum. (Ground cheater not used on preamp or amp.)
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For clarification.... You said earlier when you used the stock cord that came with the CDP the high frequency "whine" sound was gone. Where was the CDP fed from then? From the basement laundry room receptacle, or from the receptacle by the audio system where it normally is plugged into? I guess I was under the impression it was plugged in the audio system wall outlet when you switched to the stock power cord.
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Lowrider57 said:
First, thank you for the tip on checking continuity of the two cables. They both test with a beep using the Continuity Setting.
Continuity? What I want to know are the plug to IEC pin out connections
for the aftermarket power cord, the same as the ARC stock power cord?