JugHead, I have heard Beethoven Grand and Mahler in the same system, being driven by a Rowland 500W M312 stereo at RMAF several years ago.... I did fall instantly in love with the Mahlers and eventually bought a pair... There was a night and day difference with Beethoven Grands... I found the latter to be fine speakers, but sounded "matter of fact" and far from the enchanting Mahlers.
Since then, Beethoven Grands have been significantly updated... You might want to ask the seller when the pair in consideration was manufactured.
G.