Amplifiers

[MatrixS2000]

Originally Posted by richteer

Close, but not quite accurate. Single-ended (normal) connections have two signals: +ive and ground. These type of connection can be susceptible to RFI (radio frequency interferance); the longer the cable and/or more electrically noisy the environment, the worse the problem will potentially be.

In a balanced connection, the audio signal mirrored, the original signal using the + connection and its mirror using the - side (the ground is used in the same way it is in single-ended connections). Each of the signal cables is susceptible to RFI in the same manner as single-ended connections, but because the two halves of the signal are 180 degrees out of phase with each other, the induced noise sums to zero. (This is a bit hard to explain with drawing a picture!)

The signal in a balanced connection isn't necessarily a higher level one than that found in single-ended connetions, I guess hum might still be an issue.

How is this any different that what I posted (other than you adding points on interference which wasn't in the discussion)?

And where was I inaccurate?