Audiophile preamps with full bass management are relatively rare. Some have been mentioned by others. A few more are
- Anthem STR Preamp (also STR Integrated)
- miniDSP SHD
- Classe Delta Pre, not yet released. (Its predecessor, the Classe CP-800, has bass management for 1 or 2 subs.)
- Trinnov Amethyst (warning: has a fan)
- Legacy Wavelet
- NAD C658D (though the bass management firmware may not have been released yet)
As noted, many audiophiles (not me) think that DSP, bass management, or any type of tone controls limit the sound quality. In my opinion, the newest DSP products are quite good, and in many practical situations, the benefits far outweigh any drawbacks.