I've had a pair of Duetta signature in the past and still have a pair of 3.6r . The apogees were powered with a pair of krells kma160 and now I have from class t to tube amps for the 3.6s . IMHO comparing the apogees to the 3.6s is like comparing an M5 with a Mini Cooper S . And for you not to be mistaken the M5 is the apogee . Both are good but in a different ligue . Regards
Joao
Joao