Does the new Quantam work with external pre amps?

I currently use 2 Firestudio interfaces and have noticed some slight conflicts when ruing my exteal pre amps through them. I am in the market for a new interface/ digital converter and your new Quantam series sounds right for the job but there is no mention of how or if it will work with exteal pres. I currently run most of my exteal pres through a Radial Workhorse 500 series rack and that does have the dB25 outputs but the Quantam doesn't seem to accept that. Just wondering if you have any suggestions for me.

Thanks!

-Ley