After getting my own Soundaware P1 and adding Uptone JS2 and Niagara 1000, I'm happy to say that Susvara may be the ultimate end game. I still have vivid memories from my 1 hours private audition of the Sennheiser HE1, and it had everything I wanted. I want as natural and analogue of a sound a headphone system can achieve. I want holographic imaging and large but not artificial sound stage. The HE1 became my reference. At that time, I had HE1000 v2 solely powered by McIntosh MHA100 acting as both DAC/AMP. This sounded good but not in the same league as HE1.
Then I sold HeK V2 for Susvara still using MHA100. I got an incremental upgrade, but still not in the same ballpark as HE1. Fast forward to now. I have ran through a few DACs and Amps trying to find the best combination for Susvara.
In terms of the DACs, the list includes Qutest, Gumby with Gen 5 USB, Yggy A2, Pro iDSD. The Pro iDSD for me is the best fit because it is the most dynamic and punchy sounding DAC for the Susvara which can sound a little too smooth.
For amps, Pro iCan, MHA100, V281 with volume attenuater, GSX MK2, and Soundaware P1. The P1 happened before V281 and GsX. I had the P1 as their loaner program for about 3 weeks and was pretty damn sure that it's what I want. The only reason I bought the V281 and GsX was to convince myself that an obscure Chinese amplifier who's headfi thread up til today only has 90 posts can outshine the legendary V281 and GsX. Lets put it this way, the Susvara is unlistenable with all the other amps after pairing it with the P1. All other amps have smaller sound stage and sound less natural compared to the P1. There is a sense of freedom when you listen to the Susvara with the P1. To this day, this is still the biggest surprise in my Susvara journey.
Clean power won't change sound signature, but can improve listening experience dramatically. The combination of Uptone JS2 (which feeds both my Paul Pang USB card and Pro iDSD) and Audioquest Niagara 1000 (which powers the P1 and the JS2) definitely improves on clarity and separation. I think the soundstage expanded some but equivocal. There may be more body to the music but equivocal. More importantly it gives you that clean sound 24/7. You don't have to wait until 4 am in the morning when your neighbors to be asleep to enjoy clean power. When I have time, I may try to separate the JS2 and Niagara to see which makes the bigger difference.
Today I can confidently say that with my current setup, the Susvara is on the same playing field as the HE1 if not surpassed it in some areas. The Susvara has the sweetest vocals. The clarity and separation is amazing. Even in poorly recorded tracks, you don't feel congested. Soundstage is wide and deep. You can't escape the fact that you are listening to headphones, but because it's so airy, you never experience listening fatigue. Most importantly to me, the Susvara sounds completely natural and analogue. There is zero digital glare. Comparing to the HE1, Susvara has better vocals and sounds cleaner. HE1 has an edge on soundstage depth and holographic imaging.
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