I hate to ask: Is that critically important?
Not critical - digital filters are more powerful and flexible than real circuits - but both need to be carefully designed - digital filters can introduce distortion that is unrelated to the music (truncation) and odd effects like pre-ringing and they can do tricks like linear phase - analog circuits however tend to produce harmonic distortion from non-linearities (less of a problem as it is related to the music). In a good design whether you have digital filtering or analog is a minor issue - as the filters will likely be simple and robust. If A to D or D to A conversion frightens you (it shouldn't) then stick to Analog Active speakers.
Emerald Physics CS-2