If I remember correctly at about 2 feet (maybe 3) I started to hear some hiss. Sitting at MLP all was quite. Although, the ambient level in the room could have been masking it.

That gives you an idea but it’s not really a great test. It’s dependent on the noise out on the 8805 (for however I had it setup at the time), ambient room noise, and the sensitivity of my ears. To really do this test you’d have to terminate the Input at the DSP and measure the SPL out in a chamber. Andrew will know … ask him.