there are two 1/4" outputs on the SIAB, one positive (+) and one negative (-) or inverted. Sending both of these signals down the same line, with a ground (and optionally shielded) is the definition of a balanced line; its an XLR balanced line if its a 3 pin Canon connector or a TRS (tip-ring-sleeve) balanced line if it uses 1/4 stereo connectors. The wiki has a good explanation as to the utility of this arrangement for decreasing noise, and piggy backing phantom power too. While many do like passive transformer designs to create a balanced signal, op amp active designs also do a very good job, albeit with the requirement of single (or better dual, +/-) DC supplies and assorted components.
If you are set on a store bought or DIY passive transformer circuit by all means go for it, but the SIAB implementation is equivalent and has some good characteristics not found in other topologies, IMHO.
If you are set on a store bought or DIY passive transformer circuit by all means go for it, but the SIAB implementation is equivalent and has some good characteristics not found in other topologies, IMHO.
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