I have more than one chain. 6 or 7, and probably more.
I have 2 PCs that I listen to, and a couple of laptops that I don't listen to any more, 'cause I don't go to work any more. I have an M-audio 2496 and a Behringer UCA-202 USB codec. I have a couple of DAPs (Sony) and a phone, sometimes I feed them through an amp. I have at least 4 different headphone amps that get use, 1 tube, 1 LME49600, 1 TPA6120, and 1 with 16*NE5532s (8 P/C), all of which I designed and built (actually I have multiple copies of the SS amps, because of development prototyping). And some cmoys. And some in the pipeline.
4 principal sets of phones, 1 entry-level Behringer studio, 1 Koss K/20, 1 Shure E2c, 1 Klipsch Image S4 and about half-a-dozen other in-ear sets collected over the years, mostly used for testing new builds.
Then I have some TVs with USB ports, some on the TV itself, one on the digital terrestrial box/DVD recorder, that I have full of MP3s. I'm looking at an Android stick to stream the MP3s from the NAS. There are 2 wired Ethernet channels in every room and a WAP.
There are 3 satellite receivers, a standalone S/PDIF ebay kit DAC that I move around but mostly don't use, a BluRay player, a 5.1 DVD receiver with its own speakers and a couple of DVD players.
3 sets of stereo speakers, 1 Wharfedale (Dalesman, 50-year-old. A good sound but a bit gramophone-like), 1 Celestion (Ditton 15), and 1 homebuilt with Audio Nirvana 'Super 8's.
3 speaker amplifiers in use, 1 Cambridge Audio, 1 Sonic Impact T-amp, an ebay T-amp and a Rogers Ravensbrook that I can't find.
A Fostex 8-track 44k1 HD digital recorder and a Behringer 4-channel mixer, 2 studio condenser mics (one Samson USB), a few dynamic mics, some DI boxes, acoustic and electric guitars, Yamaha keyboard w/MIDI, Cubase, some tube and SS instrument amps. So you can select these into the Cambridge Amp.
I regard the sources and amps as more-or-less interchangeable, the only thing that makes much difference is the speakers or phones. I like the Audio Nirvana FRs best, they have good imaging. The T-amps are a bit quiet to drive the Dalesmans. If you took everything away except 1 complete system, I'd still be OK with that. Except maybe the Behringer studio phones, which are a bit.... dull and heavy. The IEMs are good for critical listening, but mostly I wear the old Koss over-ears.
I've got a Mordant-Short sub I'm fixing.
I'm 62. I started guitar @ ~15. I can still hear 15k one ear and 16k the other.
What am I going to buy next? A Sansa Clip+ and some Porta-pros. And some components.