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Just posting a quick impression - I had the WM1A and WM1Z side by side for a few days (granted, if you believe in burn in, neither had sufficient time burning in), and I liked the WM1A better with my 64 Audio A18. I was perfectly willing to keep the 1Z and send back the 1A, but to my ears, the warmth on the 1A was just right, and the warmth on the 1Z was a little too much for my liking. I listened to both balanced, on high gain, with 64 Audio's Pentaconn terminated premium cable. Genres included classical, jazz, rock, and electronic. With this particular CIEM, the WM1A , to me, sounded better than the AK380 and AK240 as well - though it still sounded great on both.
I think after a certain point, specifically with DAPs over $1000, they do sound different - but it's very hard to say one is specifically better in terms of sound quality. In addition, synergy is so important. After that, I believe features play a more significant role, because sound difference in DAPS, I perceive, as real but relatively minor vs. desktop gear.
As someone who has tried numerous DAPs trying to find the perfect one for the A18, for someone looking to upgrade, I would urge people to try different DAPs in different price ranges with your headphone/IEM of choice, and decide which sounds best to you. Further, since my perceived sound difference are a difference in signature vs. better/worse, and because they are real but relatively small, I would take features (Battery Life, Storage, UI, Networking), into greater consideration than I would for desktop gear. This is of course my opinion and YMMV.
Just trying to help anyone who has upgrade-itis - or feels like they are missing out because they don't have the most expensive DAP. Price very often dictates increased performance, but not always, especially with DAPs. Find the DAP that sounds best with your headphones/IEMs, with the feature set you want the most, and be confident you've made the best choice. I fortunately found the WM1A the best sounding, and love the battery life, UI, amp power, form factor, and looks. Nonetheless, you are always making some type of compromise as I would have preferred more storage and streaming. Overall, though, the WM1A was the best DAP for me, and I'm only urging people to find the best DAP for them; sometimes it will be the most expensive and sometimes it won't.
Just curios cause I only have access to 1Z and trying to figure out a difference with 1A. Did you test A18 with M15 or M20, and what cable? 1Z/1A, fresh out of the box or some burn in? SE or BAL, fw 1.2 or 2.0?