What is the weak point in my system?


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?

 

allstar

the room/speaker synergy is responsible for many issues compared to everything else in your system apart from the speaker/amp impedance relationship.

So unless you get the RTA in your room sorted, you'd be chasing your tail buying things to fix stuff which may appear fixed only to crop up again cos you did not actually fix the original issue which is likely speaker/room shenanigans

+1 @kofibaffour  If you don't troubleshoot your room first, you may be on a long, expensive, fruitless journey.

There might be other issues, but I will focus on the digital side. How are you connecting the Vault to the Qutest? Have you ever tried a different DAC? Streamers do matter, but it might not be the first thing I would try.

"Posters here say there is not much difference in the sound of streamers, so what do you think is happening."

Based on listening to several DACs and music servers/streamers in my system, that hasn't been my experience. Try listening to components in your own system and let your own ears decide.