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Post by wizardofoz on Mar 31, 2015 15:03:12 GMT -5
Actually there is a difference between the three monoblocks he listed, and the other XPA amps. Only those monoblock models are fully balanced from input to output, the other XPA's (like the XPA-5) only have a balanced input circuit, the amplifier itself is single ended. correct...but even the older UPA-1 monoblocks are not fully balanced - they use an XPA-3/5 module internally and have a bal to unbal signal change circuit internally prior to the single ended input on the amp board. It is this line that is switched alternatively to the un-bal (single ended) input. Note that sometimes bal and un bal inputs may have different gains.
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Post by audiosyndrome on Mar 31, 2015 16:36:07 GMT -5
Little bit of geek speak: "A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs.[1] It is an analog circuit with two inputs and and one output in which the output is ideally proportional to the difference between the two voltages" Too much geek speak. A fully balanced amplifier consists of two complete amplifiers in one chassis as are those I mentioned above. The output of these amplifiers are twice the input signal, not the difference like your differential amp. Stop the diffrerential nonsense; it has no bearing on balanced or not. All the other Emotiva amps with XLR connectors are converting a balanced input to single ended right at the input connector, or converting the single ended signal to balanced right at the output connector. A fully balanced amplifier is balanced all the way through; no conversions. Russ
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