Can you explain what the chain of components looks like in your system, from source to speakers? Can you also explain the type of Interconnects that are being used between all your components (ie.. All RCA or mixed XLR/RCA ..etc)? How about speaker wires, banana clips or spades or bare wire? How old is the speaker wire?
The problem you describe sounds similar to phasing / polarity reversal or copper cable oxidation issue somewhere in the signal chain.
You mention that the issue remains when speakers were swapped so I would skip them for now in the process of elimination.
I believe you mention that the issue exists when changing out receivers but may have switched sides. I would probably skip them as the possible issue as well, for now.
Now my next question would be focused on ALL the cabling and if it remained the same during the above tests you performed? When you started changing out cables did you do it one cable or cable pair at a time using the same source or did you rip and replace all cables? How feasible would it be for you to goto radio shack and pick up enough cheapo interconnects to complete the whole connection chain for one source to your amp/receiver and speakers? You can probably walk out of the store for under $25 to perform this test and it would be cheaper then looking for more primary components.
Good luck
The problem you describe sounds similar to phasing / polarity reversal or copper cable oxidation issue somewhere in the signal chain.
You mention that the issue remains when speakers were swapped so I would skip them for now in the process of elimination.
I believe you mention that the issue exists when changing out receivers but may have switched sides. I would probably skip them as the possible issue as well, for now.
Now my next question would be focused on ALL the cabling and if it remained the same during the above tests you performed? When you started changing out cables did you do it one cable or cable pair at a time using the same source or did you rip and replace all cables? How feasible would it be for you to goto radio shack and pick up enough cheapo interconnects to complete the whole connection chain for one source to your amp/receiver and speakers? You can probably walk out of the store for under $25 to perform this test and it would be cheaper then looking for more primary components.
Good luck