DSEE HX AI is available since around 2018 if I'm not mistaken. If they wanted to do it for the WM1 devices, they could've done that in the 2019 update.
They also released a firmware update somewhere in October once.
The DMP-Z1 has a very different build elsewhere, especially power management and power distributions, let alone the digital conversions and amp stage. But I leave it to your imagination
DSEE HX is a software based effect, and the DMP-Z1 player app, that takes care of the DSEE HX effect (as well as of the all other effects) is the same as the app on the other Walkman players, like WM1/A30/A40/A50. So if we're talking about the effect itself, it is exactly as the one on the DMP-Z1.
There was someone on another forum implying that it's all just a name change, from "Standard" to "DSEE HX AI", but I think we already tried it ourselves and heard the difference.
Unfortunately, I don’t work on those cables you have, so my researches are not about them. There could be a couple things you can try out.
If you think it is acting as an antenna, then have it lay next to a cellphone while observing to see if the hisses increased. Then you can go from there
Tried putting the cable with WM1A connected around, under, over, and many other similar places near 5Ghz router, 2.4Ghz routers, Zigbee routers (which is 2.4Ghz), LED lamps, power converters, Wireless RF devices in the Mhz range, Bluetooth, and nothing, the noise floor is consistent.
I am not an expert, should I conclude that it is not an antenna issue? Then what it can be? I will understand if no other answers can be provided, I will just live with it.
I wouldn’t say better, but I like it more this way and also like the way the cable feels.
its just different. @Vitaly2017 had extensive experience with that cable and the WM so he will chime in!
Tough one, aswell as the copper you also have the fine sound resistors and the larger 256gb storage. It could be the first Z1 to have the cut circuit mod with large Kaisei caps for the ultimate WM1. I'm over the moon with the prototype with large FineGolds so Kaisei should be jaw dropping. I'll be doing a WM1A for myself with all Kaisie -cut board power cap and large balanced out caps
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