All low-cost preamps or DI boxes that I have ever seen just use a simple
inverting op amp circuit to mirror the the signal of the hot side of the
balanced signal (Pin 2 or tip of 1/4" balanced connection) onto the cold
(Pin 3 or ring) to get a balanced output. So the amplifier stage is
still single-ended. And in fact some, like a little Mackie 402 mixer
that I use on my desk, don't even have a signal on the cold side of the
balanced line. They are just impedance balanced. So I don't understand
how there would be a noise penalty or any loss of signal content by just
using the hot side of the balanced output to feed an unbalanced input.
On 1/6/2013 9:52 AM, Raimund wrote:
> Taking only one of the two (amplified) balanced output rails could
> still lead to a degradation of the noise performance. So, I believe
> that feeding the difference of the two into the unbanlanced input
> would be better in terms of noise.
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