ApfelRotkohl

iPhone 15PM + AirPods Pro. IMO AirPods Pro is good enough for casual listening since I couldn't tell a difference in audio quality while doing daily tasks. Apple Music's Dolby Atmos is great and better than Tidal and Amazon Dolby.

Qudelix-5K with Apple AAC Bluetooth is good enough for IEM and headphones with high impedance.

LG V60 as my music player since I'm a data hoarder with a lot of ripped vinyls, cds.

iPhone 15PM + AirPods Pro. IMO AirPods Pro is good enough for casual listening since I couldn't tell a difference in audio quality while doing daily tasks. Apple Music's Dolby Atmos is great and better than Tidal and Amazon Dolby.

Qudelix-5K with Apple AAC Bluetooth is good enough for IEM and headphones with high impedance.

LG V60 as my music player since I'm a data hoarder with a lot of ripped vinyls, cds.

• AirPods Pro 2: my most used earphones. I would say it's one of the most comfortable earphones with the best adaptive ANC (transparency mode, conversation detection). I use it for commuting (mostly turning on just the ANC), working while listening to podcasts, and Teams meetings. The sound quality is good enough, Apple did something with EQ that boosted the bass level even at lower volumes (Equal-loudness contour) plus Dolby Atmos with Apple Music is superior to Tidal's Dolby Atmos.
• AirPods Max: I work night shifts from time to time and live in an apartment. I use this when watching TV so as not to bother my GF and neighbors.
• Thieaudio Monarch MK2: My end game level IEM. Strangely enough, I bought this for the novelty of listening to good mastering tracks like movie soundtracks, and music from Chesky Records in general.
• Moondrop Variations: Daily used IEMs, I use this for listening to Lofi and everything on the PC.

Some gears that I recently sold: Hifiman edition XS and HD800s. I personally think they are great headphones, just that the trade-offs vs IEM and dedicated speakers are not worth it.

To my knowledge, single-crystal (monocrystalline) copper cable has better conductivity than even high-purity polycrystalline copper cable due to the increase in electrical resistivity of grain boundaries. But the improvement in conductivity is relatively small around 1% which in the context of short-length audio cable makes barely any difference in perceived audio quality.

The electrical resistance of audio cable affects the sound quality in many ways: Frequency Response can be altered in multi-driver IEM with nonlinear impedance design. Signal loss, attenuation, and noise can be caused by high electrical resistance. (BIG ASTERISK) These are non-issues for most audio cables on the market since good audio cables with low resistance are extremely cheap.
Signal loss and attenuation could be a concern if you run a very long cable like in live concert. Noise can be mitigated with balanced cables.