Disclaimer:
Jitter, improperly smoothed and rectified digital samples, re-locking DAC errors(that i'm sure a-plenty in the computer interface card) do produce huge DC splashes onto the further analogue proccessing and amplification that theoretically can damage the speakers.
In most audio dedicated digital components they occur for the very short period of time and someway may be neglected. In the sound card you're now using, this problem might be on the significant level that you cannot neglect and should realy avoid.
In my case, to make a few points, I have an output transformer that won't likely pass any DC and certainly will save my speakers from such splashes but becides facing the problems with the rest of electronics ESPECIALLY power amp where everything in this case depends on quality of passive elements and the power supply as well is in effect.
The design philosophies of different manufaturers state its own truths and the right truth is the one you carefully select.
There are preamps that filter out DC and there are preamps that don't by its manufacturer's own stated reasons and they're all right. It means that if you have the direct-coupled preamp you MUST have the digital components near-perfect in terms of re-locking, jitter and certainly the high quality analogue output.
I don't want to drive you away from having Pass P preamp since this unit is truly music-dedicated piece AND has no dedication to the mixing boards or PC sound cards. There are pro-grade dedicated speakers along with preamps that connect to mixing boards and/or PC sound cards without hurting each-other.
