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What do you mean? Both input/output noise levels are -90 dBu for the DCX2496. Only at +22 dBu input signal it lowers to 112 dB, but I'm not using that kind of levels. I'm driving it with a consumer level signal.
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No, the noise spec for the DCX is stated as a value with a derived reference. It's a rather nice way of providing both the actual noise floor and (the classic spec) signal to noise ratio in one statement. Stated as -90dBu (@+22dBu>112dB)
The spec says -90dBu as a noise floor value, which calculates to a noise floor of
~24.5 uvoltsRMS (0.775 antilog(-90/20).
This value of noise floor is then referenced to a maximum input level of +22dBu (which calculates to
~9.75 voltsRMS).
The ratio (derived in decibels) between 24.7uvRMS and 9.75vRMS calculates to -112dB = [(20log (.0000247/9.75)]. That's one nice piece of equipment for the price. The clue that it's good is in the THD+N ratio.
On the other hand, the 1124 offers its noise spec in the classic dB down format of decibel only at -94dB. Not too good.
brucek