Very detailed article, worth a read
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There were some worrisome factors, such as the adoption of Android OS and the same model number (CXD3778GF) for the S-Master HX (headphone output section), but those worries disappeared just by listening.
In particular, the "NW-WM1AM2" had a much higher quality than its predecessor, and it was able to listen to a polite and detailed sound. Thanks to this, the sound of the piano is a stress-free and relaxed expression, and the female vocals also let you hear a natural singing voice with a relaxed shoulder. It should be said that it is a neutral tendency as a whole, but it is a decent expression that is comfortable to listen to, although it is sharp but not flashy. It goes great with vocals and acoustic instruments.
Also, I was impressed by the high driving force that makes the headphones sound firmly and the low distortion. In particular, it was an excellent match with the Sony "MDR-Z7M2", and it had a lively sound that I couldn't think of directly from the DAP. By the way, I listened to it with other headphones made by the same company, but it goes well with the "MDR-Z1R", and with the "MDR-1AM2", the ability of the "NW-WM1AM2" has won and it has become a regrettable sound. Was there. With other companies' products, it goes well with Audio-Technica "ATH-ADX5000", and you can hear a well-balanced sound with the sharpness of the high range reborn as a slightly more modest and neutral band expression, and HIFIMAN "Deva Pro" is also quite comfortable to listen to. It made a good sound.
Next, listen to "NW-WM1ZM2". Until you actually listen, "NW-WM1AM2" is enough, or "NW-WM1AM2" including cospa is good! I thought, but unfortunately the actors are different. You can enjoy the sound of dynamic intonation expression with a clear view due to the good SN feeling that has been significantly improved even compared to the predecessor. The basic sound character is not so different from "NW-WM1AM2", but the extension and purity of the high range, the focus feeling of the low range are definitely improved, and the music becomes more impressive and attractive sound. There is. I wonder if the benefits of the pure copper body are great, and when I hear this sound, I want to raise the rank of "NW-WM1ZM2".
In addition, it goes well with headphones, and when combined with the "MDR-Z1R", the feeling of spatial expanse is further increased, and the localization is fixed. This tendency is the same even if the headphones are replaced with "ATH-ADX5000", and it can be seen that the sound field expression is very precise. For those who want to enjoy themselves outdoors with headphones, the "NW-WM1ZM2" is a good choice.
However, the sound of "NW-WM1AM2" is also very attractive. There is a pure difference between the two in terms of SN feeling and sound precision, but with low impedance earphones, the difference between the two may not be so noticeable. As for cost performance, "NW-WM1AM2" is overwhelming, so even if you choose "NW-WM1AM2" depending on your budget, you should be quite satisfied.
It can be said that it is a product that can be satisfied regardless of which one you choose, because of its dramatically improved sound quality, convenience due to the adoption of Android OS, and improved usability. The only thing I would like you to call a Streaming Walkman is to have a built-in SIM, but let's expect that in the next generation or the successor to the "ZX500" series.