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In Reply to: RE: Questions: posted by Ralph on July 27, 2011 at 14:08:03
The vast majority of preamps I've seen share a common ground bus on their inputs and outputs.
Stu
Yes- I imagine many do. But the signal that is being heard is routed though a selector switch so the circuit is not complete for the unused inputs. So we are really concerned about how the ground is managed for the input that is in use, and in a number of preamps I think this is a problem!
However even if you have such a preamp in your system, the improvement a 4-wire setup offers is still quite audible.
However, the ground of both channels are usually shared, like the headphone wire. The outputs normally have common grounds too. In many preamps, the output and input grounds all share the same bus.
Bear in mind I am not quibbling about the benefits of separate grounds, just that the situation exists in many other components.
Stu
Certainly in most that is true. Our preamps appear to be an exception.
Regardless, in all the situations I have tried with out equipment or any other, it seems to help a lot to use the 4-wire connection for the 'phones.
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