Mar 16, 2019
Hi Captainsmart! Thank you for your post.
There is no sound quality difference between whether you choose to use your headphones via Bluetooth or with the provided audio cable. However, if you do choose to use the audio cable, the headphones will have to be powered on to experience the ANC feature. Therefore, if you use the audio cable and the headphones have no power, you will not experience the noise cancelling feature.
Let us know if you have any further queries or questions we can answer for you.
Sam F - Community Support
Jun 20, 2019
Thank you for reaching out and welcome to the Bose Community.
Unfortunately, as the DAC is not a Bose product we cannot confirm if this will increase your audio quality. I would suggest reaching out to the manufacturers of the DAC to check compatibility with other products.
If any user in the Community has any previous experience on this I would love to hear how you got on!