I recently purchased an SE200 (based a lot on the comments on this thread; thanks to all who posted their thoughts) and have been listening for a few weeks through original Solaris iems. I've been using identical Alo Super Litz cables terminated in 2.5 and 3.5, as well as a ddHiFi adapter on the 2.5 trrs to more quickly switch between se and balanced without replacing the cable on the iems. What I have found is that the single end output on the AKM side has much greater detail and texture, and a wider soundstage, than the balanced output. The balanced output has thicker tones, especially noticeable on vocals and guitars, and a more forward midrange, but that "thickness" in tone seems to hide the nuance and detail that se output provides. I haven't spent as much time listening to the ESS side.
I think it's worth noting that, according to A&K's press material, the balanced outputs on the SE200 run through completely different amp sections than the se outputs. To my ears, the nature of the dacs come through on both sides, but the balanced outputs are tuned differently than the se outputs on both sides. I wanted to ask Jason if he can comment on what the engineers were trying to achieve with the balanced amp they chose vs the se amp on each side, and if they were going for the same sound signature on se and balanced or not?
I don't usually post here, or anywhere, but wanted to comment that it is really a helpful site and I've been reading threads here for years. I know some members here also published their SE200 reviews online. This material was somewhat helpful, but also very misleading. Some people say right off the bat they never tried the balanced vs se or adjusting the settings for the filters - which seems like reviewing a Porsche without trying the different driving modes or ever shifting out of first gear. I read one review saying the timbre of the se200 was horrible. I play guitar and am kind of a tone junky as far as having small boutique tube amps as well as an original 70's Fender deluxe reverb, etc. I felt the AKM side sounded flat occasionally, and not on key, especially as songs would fade out. It didn't seem possible a digital player could be playing back too slow, and I realized that the default filter on the AKM side is called something like "super slow decay", and figured that might be what I was hearing. I changed it to slow decay, and the flat timber went away. Similarly, when I switched to the ESS side, I noticed weird sounds were preceding the attacks on the vocals. I remembered that the graphs in the AK ads show that some DAC filters produce small peaks ahead of notes, and changing the default setting on the ESS side got rid of that too. FWIW, I believe the filters are set opposite in their default configuration, with the ESS side set to a fast decay and a the AKM side set to super slow. It seems most prefer the AKM side, but setting the ESS side to slow decay got rid of a lot of things I did not like about it.
I'd love to hear others' thoughts on balanced vs SE, and if Jason can tell us if the amps on the balanced side were designed to mimic the se sound, or to give a more powerful midrange and sound overall, though with reduced texture and detail?