Help! My system is 4 years old. I have a BluesSound Vault 2 streamer (with all of my CD quality music) into a Chord Quetest D/A converter. My amplifier is a Parasound A21+ driving Vandersteen Treo CTs. All my cords and cabling cabling are AudioQuest. Then there's the preamp.
My Rogue RP-7 had an upper midrange glare so I swapped out the 4 tubes for warmer NOS Mullards. That solved the problem.
Then I upgraded it to an RP-7 V2. Even with the Mullards, the midrange glare was back and with a tilted up frequency response thinning it out robbing voices of any chest. But, it was much more dynamic with greater 3-D imaging and transparency.
So I bought a used Audio Research LS27 line stage (from 2010). The midrange glare is gone (except at high volume levels) and the frequency response is much more neutral. But compared to the RP-7 V2, it's a little foggy without the transparent 3-D or dynamics.
Posters here say there is not much difference in the sound of streamers, so what do you think is happening?