Can use a Theta DS Pro Basic III as a DAC?


I own a Theta DS Pro Basic III digital processor and my Theta Data Basic II CD Transport finally bit the dust. I wish to salvage the Pro Basic Processor.

Can I use this in place of a modern day DAC to connect a computer music server, such as a Mac Mini, to my preamp? I also own an Audio Alchemy Pro 32 if that is any help.
kennythekey
The Theta does not have a USB connection, but it does have a Toslink input. The Mac Mini has an audio digital out as a mini jack that may be optical. I'm not sure if they're compatible or if I'd be mixing apples with oranges.
Okay, I got smart and called Theta. This can be done because the Mini Mac's digital audio output is optical and the needed SPDIF format. All I need is a Mini Toslink to Toslink cable.

Yeah!!!
I tried this with a Theta Pro Prime DAC and it did work but sounded verrrrrryy verrrryy bad.
We use the Theta Pro Progeny A as a DAC with a Squeezebox, this made a good difference. I would be interested to know what level I would have to hit to see a true upgrade to this? for Example: cambridge dac majic - would this make much of a difference or do i need to go higher up the audio food chain? Any suggestions folks?