sending signal wireless from Mac to DAC- whats the best way ?

thank you guys all for the valuable inputs. 

After long consideration I decided to rip the wall and run in wall cable. it will be way cheaper and more stable than any airplay.

Thanks !

@signalwaves 

how do you send signal from Airport Express to the system ??

Via 1/8" jack or USB. ? 

@signalwaves 

So Analog/Optical Audio Jack works 2 ways, as analog directly to the preamp with split adaptor or as digital/optical via optical to the DAC, is that correct ?

Now, rest is simple, question is if you can see your DAC as peripheral in your sound management of your MAC or you see AirPort Express ?

@signalwaves 

idea is there I will explore that route for sure.  I actually started it already and dump it since I used wrong airport device