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Re: Difference NS 69i and NS 69k?
Author: David Satz
Date: 05/04/2006
Herman, a person may be entirely confident about his opinions, but the degree of his self-confidence doesn't tell you whether his information is really correct or not. I have the schematic of the CU 48[i] powering unit in front of me, Neumann document number 1 1437-930-000.03, dated January 6, 1974. It shows _direct connections_ from the audio inputs to the audio outputs; no filtering is indicated. If you would post the serial number of your CU 48, perhaps Mr. Schneider could tell us whether or not this should be the correct schematic for that particular unit. If it is, then one would really have to ask where the sources that you quoted got their supposed information.

That leaves only one question: do coupling condensers unavoidably add audible coloration to audio signals? There are conditions in which capacitors produce small but measurable amounts of non-linear distortion. The amount and kind of this distortion depends on the circuit, on the exact type and condition of the capacitor, and on the particular signals.

When such distortion occurs, can it be audible under real-world conditions? That's the most important question for our purposes. If someone claims to know the answer without considering the particulars of the circuit and of the signals, in my opinion their answer can't be taken seriously. The use or non-use of a capacitor is an engineering choice like any other--it depends entirely on the practical context and the required results.

--best regards  
 
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