Rogue Audio RP-1 DAC use

Did any of the previous configurations sound better without the RP-1?

No, jbuhl. Before the RP-1 the DAC from the Oppo 105 was an improvement from a Pioneer Elite rcvr on board DAC a Cambridge DAC magic then a Sherbourn PT-7030 preamp on board DAC and a Schiit Bifrost original DAC, in that order. After replacing the Sherbourn with the Emotiva XMC-1 I noticed I couldn’t really tell the difference between the XMC-1 and the Oppo. BUT they were BOTH better than the DAC in the Bluesound Vault. Since I was mostly just using the Oppo as a DAC, I sold it to help finance a new turntable. SINCE installing the RP-1, the DAC from the Vault sounds as good as the DAC from the XMC-1(actually I hear no difference between the XMC-1, Bifrost or the Vault DAC) I have a friend with the same speakers AV123 Strata Mini’s (i don’t wish for the pro’s or con’s of those speakers to be a part of this discussion) an XMC-1, an Oppo 205 and a Bluesound Vault. He just got a used RP-1 (by the way mine is used also, we both got them through Audiogon sellers) he also says at first listen he can’t tell the difference between the Oppo 205 DAC and the Vault DAC(he’s just complaining a cross country move will give a more critical listen later) he says BEFORE installing the RP-1 the Oppo DAC was better.

Just wondering if my speakers could be the limiting factor here?  They are not very efficient AV123 Strata Mini's.