I am barely dipping my toe into better audio gear. I have a Superlux HD661, and some cheap IEMs I got from Massdrop. While it's okay, I don't have any DAC/AMP. I am also cursed with a large cranium so it took me two or three tries to get headphones that fit me well. Right now I'm getting by with a cheap crap Logitech G230 for my PC audio because it actually fits my head, whereas the SuperLux... just barely fit my head. Right now, I mostly listen to audiobooks, not music, but I want to get back into listening to music. My primary audio source is a Kindle Fire (yes, I know) and maybe my Samsung Galaxy S6, with a tertiary source of being my PC (old Dell XPS). If I am moving about I'm using Bluetooth headsets (a cheap neckband SoundPeats Q900 and an Avantree Audition), but I go by wired headset back home. So here's the real question: I don't REQUIRE a portable headphone dac/amp, but I do welcome the flexibility if it won't cost me a lot. On the other hand, does having a desktop dac/amp (for PC and Android) actually gain me that much fidelity? My budget is low, under $100 preferred. I am not an audiophile (yet). Don't need DSD. Right now I am thinking about * Portable: SMSL IDEA // Soundblaster E3 // FiiO Q1 Mk. II // Topping NX2? NX3? * Desktop: ????? It seems SoundBlaster E3 offers the most flexibility. I can use it in BT only (amp) mode with my SuperLux and my Android devices with no fear of incompatibility, or I can go USB/DAC mode if I want higher fidelity. The other devices are USB/DAC mode only. I guess the only neg here is BT here doesn't seem to support AptX? Is there something comparable on the desktop side?