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

I just purchased an Apple Airport Express, $30, based on the response from kijanki.

Great purchase! It just works.

@signalwaves 

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

Via 1/8" jack or USB. ? 

The AirPort Express has a:

• Analog/Optical Audio Jack

AirPort Express Specs

Audio out via optical Mini Toslink connector to Toslink to DAC:

Cable

I am using the AirPort Express as a standalone unit via WiFi, Airplay, from an iPad, iPhone, Mac. I have no issues using Airplay. I have had issues with other Airplay devices, not this one.

@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 ?

Express Output:

I thought it was odd too.  Either as analog or optical mini Toslink out.  I have no idea if it could be split out to both analog and optical.  

I noticed the Airport Express as an "Airplay" device, as an option for sound output. The DAC was not visible on the list.    

Example Here:

Youtube