Something not too many people have, but you really like. Not like a flashlight or a knife/multitool. My most unique (although still popular) are probably my loop quiet ear plugs. They come in handy in a lot of cases and word really well.
I use Tidal for listening to music on my phone most of the time, whether wired or wireless. That, plus USB Audio Player Pro for wired listening, gives a pretty good sound quality over my DAC. At home and in my work office I have dedicated DACs and tube amps for driving my cans (Schitt Modi + Littleblack Mk.2 in my office, Schitt Mobius + Feliks Echo 2 at home).
I use the dedicated DAC on mobile for a few reasons:
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My phone doesn’t have a headphone jack and I have been dissapointed by most USBC-to-3.5mm dongles’ build quality, so using a higher quality DAC gets around that.
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I also generally prefer a balanced 4.4mm jack over an unbalanced 3.5mm, both for a more solid physical connection and to reduce crosstalk, and my DAC has both 3.5/4.4mm ports.
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For wireless. I use IEMs that have a wired connection and the bluetooth adapters/replacement cables are pretty low quality in my experience (low battery capacity, poor sound quality, poor build quality, finnicky connectors, etc.) and a combo bluetooth/wired dac is avoids most of these issues. It also means I can keep the DAC and my phone in different places on my person (great for having my phone on a stand while biking and keeping the DAC in my pocket, or leaving my phone charging while I listen to music in my lab).
