installing an ARC system

I would say its probably better to fix the room itself then to start fooling with your system.

Good suggestion from Zd542.
Zd, he might be in a situation where he cannot correct his room - maybe "she who must be obeyed" wont let him?

I don't see why an ARC system cannot be applied to a pre/pro without room correction.
Do you have an ARC pre? Or, are you using the pre/pro as the pre for the ARC system?
If you are using an ARC pre - use the bypass or direct function on your pre/pro to simply feed the ARC pre signal to the ARC amp without the pre/pro altering the signal.
If you are using the pre/pro I bet that you can change the signal any way you want - boost the bass, extenuate the midrange, tone down the highs, etc, etc - before feeding it into the ARC amp.
FWIW.

It is not clear to me what you mean. Do you mean ARC=Anthem Room Correction or Automatic Room Correction or Audio Research Corporation? There are several other meanings for that abbreviation.

If you mean the first of these, it is available only in Anthem prepros or in Paradigm subwoofers. If you mean the second (or third) of these, you can purchase such devices (or software) and use them with almost any system if it has suitable connections.