the recording format is "24bit 48 khz wav"

when u record silence in protool with the input is not connected
what is the peak value?

I am using Apogee ad-converter and get -139db in some recording program
but in other recording program the results is not the same

"bluesjeon" wrote ...
the recording format is "24bit 48 khz wav"

when u record silence in protool with the input is not connected
what is the peak value?

I am using Apogee ad-converter and get -139db in some recording
program but in other recording program the results is not the same

The theoretical noise floor is a simple mathematical function
of the bit depth. Some software may be recording only 16 bits
and not the full 24 bits that are available from the hardware.

The actual noise floor is a function of the design and build
quality of your equipment, and the system/environment in
which you have it deployed (including the software).

In article ,
bluesjeon wrote:
the recording format is "24bit 48 khz wav"

Sure, but is there 24-bit data in that 24-bit file?

when u record silence in protool with the input is not connected
what is the peak value?

That depends on the converters. If you record without any converters at
all, the peak value should be 0x0000.

I am using Apogee ad-converter and get -139db in some recording program
but in other recording program the results is not the same

Right, because you are looking at different word length in the different
programs.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

when u record silence in protool with the input is not connected
what is the peak value?


If you truly want to record the self noise of the system, you will need to
short the inputs.


Richard H. Kuschel
"I canna change the law of physics."-----Scotty