I tried out the A105 and ZX500 today at a show - went mostly to test those two DAPs.
The A105’s output power is so anemic as to render it functionally useless. The volume limiter function in the UI was off, and it’s not the EU legal volume limit either (plenty of other gear, including Sony’s, go much louder). I used my R2 Aten for the audition, with sensitivity rated at 106 dB and 32 Ohm impedance. I plugged them in, thought it sounded okay though faint, and wanted to bring up detail with a bit more volume - I was aghast to find out it was already at 120/120.
I was very curious about this one, and bummed that Sony charges 350€ for an utter dud. My audition stopped there.
Alas, I was quite disappointed by the ZX500 too. The SE output is barely more powerful than the A105’s (50 mW instead of 35). Depending on the song I needed 112 to 120/120, but it’s (just about) enough for easy gear. Overall it sounds good. The bass hits with a nice punch, it’s not huge in quantity. The mids give a strange edge to some male vocals, or slightly smother them depending on pitch. Meanwhile female vocals sound lush. The highs are on the smooth side, not hugely expressive. Detail is decent. The general impression is of a rather reserved signature; pleasant. Probably good for vocals (female jazz singers specifically), with a nicely dynamic foundation in the lows, and unobtrusive treble.
It’s not tiny but meaningfully smaller than a smartphone, and very light, so in terms of format Sony hit the mark.
Sadly, “lightweight” is how I’d characterize the ZX500 in general. Such a design begs the question: why? I know it’s not good Head-fi etiquette to bash on gear inside of its thread, and I don’t want to piss on anyone’s parade. I detect some defensiveness already - for the record I do find the recharge time outrageous (in the days of quick charging having to plug a device overnight doesn’t fly) and can also confirm that at this early stage software operation on the ZX500 is indeed very slow - navigation is slower than on the A105!
There I was with my LG V30, also upgraded to Android 9, that happily drives full-size headphones while sounding somewhere between just as good and a bit better. Snappy too. I can stream Tidal using cellular data in addition to Wifi. It’s available for 300€ on Amazon. 350€ for the A105 is just a joke; it seems like the maximum price point where the ZX500 would seem like an interesting device. For 800€ to 900€ I can get an iBasso DX220, bigger and heavier indeed, but much more powerful, versatile, with more body to its sound and modular amping.
The balanced out will be the saving grace for some I imagine. It’s 4x more powerful than single-ended. And the pocketable format is rare and a boon.