Well there you go,
@MarcT ... the tower is waaay more balanced. I did a quick overlay... In absolute terms, the tweeter output of the lumina V is down 2 db. If we peg it relative to the scooped out midrange of the II (probably due to skimping on baffle step compensation to boost the sensitivity rating), the tweeter is down a whopping 7db. Now I don't know if the port output has been stitched into the response, but I would guess at minimum the V has twice as much perceived bass as the II at the same listening level. All this to say... not going to be a bright-sounding speaker. If you don't toe-in the speaker directly at you, the mild tilting up above 8khz levels out as well (so try that if you feel it's dull).
It seems like you're really wed to the audiophile idea of component synergy and matching like wine + food pairing, but the most basic of measurements (simple on-axis frequency response here) tells most of the story. If I owned a Krell, I would hang onto it.