Connect a external DAC

Hi!
I have an Airport Express Gen 2. I´ve connected to my Reciver (Onkyo) with toslink cable and it works fine!
To get even better soundquality I have tryed to connect an external DAC (TEAC)... The USB input sounds good,
but the optical(TosLink) is not so good... If I connect my Mac Book Pro via Toslink it sonds great! If I connect my
Airport Express via Toslink the music have a variation of volyme??? every 10 second. And agin not connced to my reciver.
I will contact TEAC as well
Rightrider

If your goal is to connect the audio source to your Onkyo receiver via a digital optical connection, then using either the internal DAC in the Express or an external one will offer no advantages. That is because DACs are used to convert digital to analog signals.
Unless you plan on connecting this DAC to one of the Onkyo's analog audio ports, there would be no need to use it. In this case the original digital audio signal coming from the source would have to go through two DACs further degrading the signal.

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