Welcome to ASR. Let's see what we can actually do to help.
The issue here is that you are buying this system (which is an unknown, as you have asked the question without details) and are putting it into a different room/environment assuming it will still sound the same. There is no guarantee that the speakers are going to work at all well in the different room, or that the amp is powerful enough if the new room is larger, or you are listening from further away. That is the first question we should really be addressing.
You may find that you prefer a neutral sound to the system you are buying, if you could compare the two blind - that is what the science tells us would happen - so you should consider alternatives to your planned setup for that reason. There is no magic to tube amps per se. They are rarely best for genuinely hard to drive speakers, by the way.
As for the DSP:
- You could use room treatments instead.
- You could use minimal correction, just to deal with bass issues in the room. and leaving everything else alone. That will not "throttle the tube amp sound", whatever that means.
The amp will still not necessarily control the speakers "correctly", and will still put out the same harmonic distortion. You may get some additional inaudible noise from the DSP, but that's all. (This is assuming that the tube amp sounds audibly different, and that is by no means certain, either).
- You could also sort out the bass in room with additional subwoofers if needed.
My system only has correction for one of three sources, and it consists entirely of one PEQ filter. I'm not going to lecture you on not running it. Nor are many others here who don't run DSP but use other methods to match to the room. It is a very good solution to a lot of problems, and maybe a necessity if you are going for the highest fidelity neutral sound, but in your case it is not necessarily an absolute requirement. I'd recommend you have a plan to incorporate it if needed.
Buying the same system for every room/environment though, I am going to call out. Let us know the speakers, amp and room setup you are putting it into, and then we can help.
Details, please.