Using D Prem as preamp

[Jean-Marie]

Since your speakers are supporting bi-wiring / bi-amp, you could try running bi amplified by both the D Premier and the Pass Lab.

I would personally try the D Premier driving the bass and therefore would configure the pre out as high pass with a cut off frequency of 250 Hz which is the cross over of the Olympica.
The Pass Lab would then drive the medium and highs, which would also be compatible with the fact that it is delivering 60W on 4ohms while the D-premier is capable of 160W at 4ohms.

Just an idea

Jean-Marie