Do earbuds for balanced audio exist? Something with detachable cables or an attached cable with 4 contact TRRS connector?

How does sound quality compare for CIEMs and loudspeakers + amplifier in the 1000$ to 1500$ or € range? A pair of Bowers & Wilkins 686 S2 bookshelf speakers costs 900$ for example. Of course, you can buy used for loudspeakers. I am especially eager to compare new to make purchase ease more similar.

What duration of wait for a response to e-mail is how good? What duration is short and a good response time? What duration is long and a poor response time? What duration is an intolerable response time? On the subject of communication: I strongly advise against attempting to purchase from...

Does less metal in the tinsel wire cables compared to wire with litzes have a clearly noticeable effect on the volume of bass when used with IEMs? -- when used with around the ear headphones? -- through 20m long cable? Would it make a difference for recording microphones which get power from...

Which audio player manufacturers are using 3.5mm or smaller connectors and balanced audio (differential signal) their current players? I am declined to purchase from a maker who is not using it in their most recently developed products. If they are not dedicated to balanced audio in their...