Late to the party but: I recently auditioned pairs of recently refurbished 989 and new 2905s. (NB I owned QUAD ESLs in England and stacked QUADs and 63 in the USA. I tried Maggies but "went back to school" )
I found both speakers to roll off the top end and reduce transparency even with high damping factor solid state equipment and cables of impeccable pedigree. Valve amps with high output impedance really took off the top.
Since then I have seen measurements from various sources that confirm they roll-off from 8-10kHZ on down even in the "sweet spot." I don't consider a speaker down 15dB at 15kHZ to be a viable offering. Bring on the super-tweeters, Nordic cables and endless tweaking for the hobbyist.
I found both speakers to roll off the top end and reduce transparency even with high damping factor solid state equipment and cables of impeccable pedigree. Valve amps with high output impedance really took off the top.
Since then I have seen measurements from various sources that confirm they roll-off from 8-10kHZ on down even in the "sweet spot." I don't consider a speaker down 15dB at 15kHZ to be a viable offering. Bring on the super-tweeters, Nordic cables and endless tweaking for the hobbyist.