Does your integrated have preamp outputs. You would connect teac to the integrated and preamp outputs to your Odysseys. The volume on the integrated would then work
Your Teac has a wonderful low output impedance of 22ohms with 2v output, your Stratos is 22kohm input impedance and only needs 1.5v for full output.
As you can see the Teac is a perfect impedance and voltage match, you can't ask for better, absolutely no need for a preamp. Unless you wish to colour the sound a little.
I believe the volume is controlled by the TEAC UD-501 Dac.
I don't believe the computer controls the volume in this case, it just gives a digital output signal, coax (spidf) or optical (toslink)output to the Teac, the volume is then controlled from there.
Just like it would with a separate CD transport and dac
Sorry ZM, I thought the volume control on the front would have done both head phone jack and rca output.
If not then you could use still the headphone jack, as it is also a low 32ohm output impedance, though it may be a bit higher in output voltage, more like 6v like an active preamp would be anyway. But you'll need an stereo rca to headphone adapter.
Just make sure the Audirvana volume control is set to all the way down for the initial power up. Seems simple enough to me to avoid the speaker thrashing?
If it was a Windows machine maybe I would worry a little, but a Mac, come on seriously :)
I have done the same thing recently, Mac Book Pro with Audirvana 2 going from DAC straight to amp and there is no looking back. One less box, one less set of cables, two less sources of coloration and losses and anything extra.
Run your system like a race car. Less is best.