Snicka: I think that the units with adjustable input gain are designs that do not allow analogue pass through. If i recall correctly, the ACT 3 does allow pass through, so it may not have this feature.
For those that are wondering what pass through is, it allows an analogue source to remain analogue as it passes through the pre / pro. If a unit doesn't offer analogue pass through, an analogue source ( tapes, FM, vinyl, etc... ) are converted to digital signals at the input and then converted back to analogue signals to feed the amplifier. As one might guess, there can be quite a bit of signal degradation in such a scheme and that's why so many people made such a fuss about lack of analogue pass through on early processors. Sean
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For those that are wondering what pass through is, it allows an analogue source to remain analogue as it passes through the pre / pro. If a unit doesn't offer analogue pass through, an analogue source ( tapes, FM, vinyl, etc... ) are converted to digital signals at the input and then converted back to analogue signals to feed the amplifier. As one might guess, there can be quite a bit of signal degradation in such a scheme and that's why so many people made such a fuss about lack of analogue pass through on early processors. Sean
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