Great story! Hope you can get the headphones repaired, but here’s my experience with sennheiser HD800’s with cardas’ best cable, plugged into the balanced outputs of a very high end all tube preamp.
The headphones sound great, but can’t hold a candle to really top end speakers, like my TAD’s. Going to the speakers (with added subs and super tweeters) is like going to high resolution. With the right recording it mimics real instruments, and makes the headphones sound low res in comparison. But headphones are a bargain compared to a $100k+ system.
Mastering legend Bernie Grundman recently stated in an interview that a component that measures perfectly but has more components in the signal path sounds worse than a component with less in the signal path, even if it doesn’t measure as well.
That’s why the audiophile (unobtainable) holy grail is a straight wire with gain. Meaning just one wire that did all the processing necessary for an audio signal with nothing extra in theory would sound best.
When I was a kid a bought a 10 MXR channel eq I used on 20 foot RCA’s and loved playing around rebalancing tracks from my couch, but analog eq introduces among other things phase shifts. That’s the beauty of using eq in a music server like Jriver, which doesn’t suffer the same issues. That’s where I’d leave eq in a modern audiophile system. If needed for vinyl playback, use a preamp with a tape loop so the eq is only in the signal path when desired.
Regarding phase shifts, some will be unable to hear the degradation because they don’t have phase accurate speakers. It’s one of the reasons I run with Andrew Jones designed concentric speakers. When you hear a phase coherent speaker and play a recording that preserves that phrase info, it’s a real revelation to hear.