No doubt audiophiles also go outside more often when the weather is nice. A good quality portable DAC like this one from Cayin for the smartphone is practical then.
It should be no secret (anymore) that most smartphones fall short when it comes to sound quality, with a few exceptions. If there is a headphone jack availabe, the sound quality delivered is usually mediocre. Most phones no longer even have such a jack anymore, nowadays. And so a portable DAC is needed to listen in hires quality with a wired headphone. Precisely for this purpose, Chinese Cayin has released the new RU7. At its heart is a 1-bit ladder DAC consisting of a resistor network of a total of 128 resistors.
Symmetrical
You pair the RU7 via a USB-C cable; an optional Lightning cable is also available. A standard mini-jack is provided, plus a 4.4mm Pentaconn jack for symmetrical headphones. The Cayin RU7 plays both DSD and PCM.
The RU7 costs €349.