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Balanced
connections are really crucial in recording studios where levels
of interference can be very high and the very low voltage signal
generated by a microphone may have to travel a considerable length.
The advantages of a balanced connection system for domestic use
are not quite so clear-cut, typically cable lengths are a lot shorter
and signal levels a lot higher. If you have the option of both
single-ended and balanced connections, we would advise that you
listen to both and decide which you feel offers the better quality
of sound.
A transformer inside the component takes the signal and turns it
through one hundred and eighty degrees. This inverted (or mirror
image of the original) signal is connected to one of the contact
pins on the XLR socket, the original signal is sent to another and
the final pin is used to complete the circuit. When the signal arrives
it is fed through another transformer and any noise (interference
picked up along the length of the cable) common to both the in phase
(original) and inverted phase (mirror image) is cancelled out.
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