Jeff, I did not mean that noise, voltage transients, were not causing the popping sound from the speakers. I was only saying I think his problem may be more serious. Equipment failing.
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>" I don't see any recommendations above that seem unreasonable and I keep wondering about the first thought from Avguygeorge."<
>"I keep wondering about the first thought from Avguygeorge."<
>>>>>>>>
I agree, that is why I asked the questions in my first post and wanted him to do the test I described in my second post.
The utility transformer that feeds "Krell Man"'s home is a single phase 240V center tapped secondary winding. With this transformer secondary configuration only the unbalanced load will return on the neutral to the source. Example, if a total 120V connected load of 30 amps is connected between L1 and the neutral, and a total 120V connected load of 30 amps is connected between L2 and the neutral, 0 amps will return on the service entrance neutral back to the source, the utility xfmr. If in the above example the load between L2 and the neutral was, say, 20 amps then 10 amps of load would return on the service entrance neutral to the source.
If we were to use ohms law E = I x R we can find the total resistance of each 120V total connected load.
L1 120V total connected load, E= 120V I= 30 amps R = 4 ohms
L2 120V total connected load, E= 120V I= 20 amps R = 6 ohms
Now lets see what happens if the service entrance neutral has a faulty connection somewhere between the utility xfmr and the neutral bar in the main electrical panel. For the example the service entrance neutral conductor has been disconnected at the utility xfmr. Also at this point the earth ground has also been disconnected. Will come back to this later.
What we have is the L1 connected loads travel back to the electrical panel neutral bar, and the L2 connected loads travel back to the electrical panel neutral bar.
But with the loss of the service entrance neutral the two loads are now in series with one another.
The total resistance for the total 120V connected load on L1 is 4 ohms.
The total resistance for the total 120V connected load on L2 is 6 ohms.
Because the two loads are in series with one another we have a total combined resistance of 10 ohms.
E= I x R
E= 240V R=10 ohm
240/10 = 24 amps
(current is the same in all parts of a series circuit).
Now that we have the total current flowing in the series circuit we can find the voltage drop across each of the two connected loads.
E= I x R
L1 total connected load
R= 4 ohms I= 24 amps 4 x 24 = 96V
L2 total connected load
R=6 ohms I= 24 amps 6 x 24 = 144V
96V + 144V = 240V the source voltage.
I tried to keep this example as simple as posible. This would be purely resistive loads....
Now back to that earth ground disconnected for the example.
If reconnected it will change the voltage drop values.
Though NEC does not allow the earth to be intentionally used as a circuit current path, with the service entrance neutral conductor not connected current will flow through the earth back to the source. How? Utility companies bond every xfmr case and the centertap, the neutral, to earth ground. The current will also travel through your neighbors earth grounds to their electrical panels and travel out on their service entrance neutral conductor. The resistance of the soil will determine the amount of current that will flow.
>"I keep wondering about the first thought from Avguygeorge."<
>>>>
Could very well be....
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Overhead fed service
Connection in the meter socket.
Connection at the weather head.
Connection at the utility xfmr.
Connection at the electrical service panel.
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Underground fed service
Connection at the meter socket.
Connection at the utility xfmr.
connection at the electrical service panel.
*The service neutral conductor damaged under the earth. If aluminum is exposed directly to the earth in time it will deteriorate and corrode in-two. All it takes is for the outer insulated jacket to be damaged and the aluminum conductor exposed.
