All responses to use the dedicated Bose EQ are primary. Also, to incorporate the EQ into the existing electronics is the first step. Since these speakers aren't capable of critical music listening to average ears, everyone has their own priority as to what they want.
Had a friend who had a very large house and entertained often. Had a large room that he used for entertaining guests at parties and such. In that room he had a pair of 901s suspended from the ceiling with chains. Purpose was to provide background music for his guests. Worked well for that. Of course he had his serious system elsewhere.
All this stuff is complex and the end game is what suits the user. Some like what they have and others always want to constantly improve theirs no matter how good it already is. Kinda like a hobby.