Once properly EQed, healthy 288-xKs are among the best sonically balanced drivers available . Your 288(s) may not be healthy ( they are afterall , about 25 years old ) .
- These drivers ( especially on Constant Directivety horns ) need EQ to be flat out to 13Khz . ( I'll assume you may like a relatively flat HF response / like most of the population does )
- I don't have any MRs horns here / so I can't comment on whether the horns are adequately damped or not ( they are aquaplas over a lightweight metal such as tin ) .
- These horns are relatively huge ( in size & voicing for home use ) & so demand to be paired with a likeminded ( similarly sized ) hornloaded midrange below them ( ie; twin 515x in 210 or 817 cabinets / plus subs ) .
- I'd suggest ,getting some test gear & then learning how to make custom EQ compensation filters / assuming you want to keep DIYing .