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Re: Difference NS 69i and NS 69k?
Author: David Satz
Date: 05/10/2006
Herman, the idea of "keeping power and audio signal paths separated" might be something for a microphone designer to consider. However, for the past ~40 years everyone has tried to do the exact opposite, except in vacuum tube microphones--and nowadays even some tube microphones are phantom powered. Keeping the audio and powering separate requires special cables, which become more expensive and more fragile for each additional wire they are forced to contain. Surely you've noticed that cables for your SM 69fet cost more than many professional microphones, and can require considerable maintenance if you use them for live on-location recording.

Klaus objects to one particular means of separating audio from powering which may or may not be used in your preamp: input coupling capacitors. With an NS 69 instead of a CU 48, he says, you could choose a preamp without input coupling capacitors. However, if you choose a preamp with input transformers, then you might as well continue to use your CU 48! Contrary to what you have been told, the CU 48 has direct connections for the audio signals from its inputs to its outputs.

I think there are two possible cases (shout-out to "Jacobowsky und der Oberst"): Either your preamp has input coupling capacitors, or it doesn't. If it has them, you could get a different one, or modify your preamp to use transformers instead--thus removing Klaus' only objection to the CU 48. If, on the other hand, your preamp doesn't have coupling capacitors, then Klaus' only objection to the CU 48 was never relevant to your situation.

Similarly, if your preamp has input coupling capacitors, then its sound is already influenced by them, if they have harmful sonic effects. Thus it doesn't matter whether you use the NS 69 or the CU 48 in that case, either.

Is the situation any clearer now, I hope?

--best regards  
 
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