Spectral SDR4000S vs. SDR3000 & 2000 comparisons.

Can anyone tell me what are the differences in sonics between the latest Spectral SDR4000S CD player versus the Spectral SDR3000 CD Transport and SDR2000 DAC combo (for those who had actually heard them both)?
The new Spectral SDR 4000S with the Long Filter has a beguilling midrange and greater rhythm + drive compared to the older SDR 3000 + SDR 2000.