number1sixerfan
Headphoneus Supremus
Bad news, I don't think you'll hear a step up in SQ since that stack is already very transparent and the A90 has plenty of power. But also good news, you can also skip all the audio-nervosa associated with DAC/Amp pairings that people on this forum go on forever with once you prove this to yourself. When you get the "upgraded stack" you'll swear it'll be an improvement and most stop there as the differences are "too obvious" to bother with blind testing. But if you actually work on doing a careful level matched blind-test with a simple & cheap switch box to compare stacks - most likely you'll hear no difference (unless one component of any of the stacks are bad) and this can be a complete shock.
I've personally done this with my Susvara and many many amps, especially since 80% of the content on this thread is amps for Susvara. I was able to personally satisfy (along with six local audiophiles who over the months brought their own amps and blind tested with me) that there's actually very little mystery to properly amping a Susvara.
Note that this has been said by a few others on this thread here but they eventually get too much hate for this opinion and they get frustrated and leave, so I had to find out for myself and eventually saw their unpopular opinions were correct. The difference is very very few on this thread have ever went through a properly setup blind comparison between stacks. Since you mentioned you're a newbie and new to head-fi I wanted to have you consider this before you get bombarded with suggestions of much more expensive pairings as "upgrades" for your setup and we continue with the regular amp discussions.
Bias works in many ways, and there's an obvious amount in this post. That said, I do think you can very much enjoy the Susvara across a varying level of gear. I've done it myself with the Hugo 2 and GSX Mini--both excellent for their price range. But certainly, it's very easy to distinguish from that system and say a TOTL speaker or headphone amp + the DAVE or similar.
In any event, I am totally in support of being happy where you are and just focusing on enjoying the music. But suggesting that people stop at entry level equipment because they won't hear a difference otherwise is just flat out disingenuous. Lastly, I'm definitely a fan of A/B testing over time, but there are a lot of well known issues with short duration double blind tests.
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