Should speakers be upgraded before preamp and amplifiers?

@lonemountain has it exactly right… Transducers have the most difficult job to do… You can also think of a DAC as a transducer, but given a competent dac, i would work speakers first

Inna I agree, start a new system.15 K is descent amount to be able to start a new one.So many options now.Schiit gear affordable to be able to achieve a good system.Omega , Tekton, used Borensen x1 speakers, Kef meta 

I've not heard your speakers, but have heard a 9090DB through Tannoy Reds and would recommend, as others have, that you test drive a few other amps with your VS speakers before going back the drawing board.  Receivers offer convenience but are always a compromise.  Perhaps use REW software, a microphone, and laptop to see where the trouble spots may be with the room.  They'll be there regardless of the amp.