Marshall speakers, from my experience, has a brand sound signature, and that tuning is not very optimal for every genre of music.

Replacing the DSP with a simpler amplifier may allow to get more detailed sound from the drivers and the box themselves and may create a more pleasant listening experience.

From what I have seen, the drivers seem pretty full-size for that box, and any disturbing sound characteristic can be tuned with a simple equalizer. A more dynamic approach might create audibly weird sound profile if done wrong.

Modern DSPs are magic, but I still prefer an audio pipeline where things show their deficiencies and not hide things real-time.