for an audio signal within the rails of an opamp, can its quality be improved by the + and - rail voltages?

Question

I have a high end audio application in which I'm using the NE5532 opamp. I'm processing an audio signal with 10Vpp swing (so between +5V and -5V) in an audio ADC input stage. Does it make any difference for the audio quality whether I use +/-14V or +/-11V as supply rails? If yes, why?

Additional info: my converter takes differential inputs, each input between 0 and 5V. My circuit feeds it two signals centered around 2.5v, each 2Vpp so after subtraction the ADC sees a 4Vpp signal. This is a 32-bit converter and the sample rate I'm using is 192kHz. I cannot change the converter. Given this scenario, does it matter sound quality wise to use 11V or 14V rails?

Answer 1

In general, you want your input signal to swing close to the rails of the ADC’s specified input voltage range, in order to maximize the converter’s dynamic range.

Make sure you back off a little to accommodate any gain error of the device.

From TI doc SBAA004A

The signal amplitude should be closely matched to the analog input range of the A/D. This is done to maximize the dynamic range of the converter. For example, if a 12-bit converter with a 20-V input range is selected, the value of one LSB is 4.88 mV. It would be ineffective to use only a small part of that range, for example, if the input signal was 2 V. A better solution would be to select a converter with a more optimal input range, or to insert a gain block in front of the A/D (keep in mind new errors which the gain block will introduce). Many high speed converters, due to process voltage breakdown limitations, have small input ranges. If the signal bandwidth is small and a high degree of accuracy is needed, it may be advantageous to consider using a lower speed A/D with a larger input range.

edit per comments: The voltage level of the rails to the op-amp won’t have any affect on noise, so long as it’s in spec and the amp stays thermally cool and regulated.