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Marantz PMD 661 noise floor

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Fintan O'Brien
Marantz PMD 661 noise floor
on Dec 26, 2011 at 7:49:15 pm

I bought Marantz PMD 661 recorder last year and find it a great piece of equipment. There is one thing that I would love to know and that is why does the noise floor never go below -79db even when recording in 48Khz 24Bit.
I made a test recording in line level with the gain turned down to Zero to see what the true noise floor is, but it only goes to minus 79db. I measured this by opening it in a stereo editor and having a look at how high the level goes to. Although I am unlikely ever to hear this noise floor, I feel it should be lower than this, even the 16 bit noise floor is lower. Does anyone know why this is?

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