Basically yeah. But I will warn you, your ears are used to a very bright headphones right now so you're going from one pretty extreme end to the other pretty extreme end of the spectrum in terms of treble. The dark HD6XX might sound wrong at first or maybe even less detailed because of the treble but you'll have to give your ears at least 2 weeks of adjusting and then go back to your old 770 and you'll be mind blown.
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Depends on what you like but for beginners the differences are very small. The HD600 is a very neutral headphone, the HD650/6XX is a slightly 'flavoured' version of the HD600. The HD600 is loved for its excelent timbre and vocals as well as its very decent resolution for the price. Most people also love it for how neutral it sounds but it does get sorta boring at some point. The HD650/XX is almost the same but adds just a bit of extra bass (+3db iirc) and has slightly reduced treble so whereas some headphones like the DT770/990 sound bright and almost piercing/fatuiging to some, the HD6XX is the exact opposite. It has a very relaxed 'warm/dark' non-offensive sound signature and in combination with the small soundstage and excellent vocal quality many people describe these headphones as intimate.
IE600 amd clear OG. Any suggestions for a tube amp for the clears? I heard tney change a lot with tube amps.
I think sennheisers are always a good investment because of how durable they are. I have chi-fi IEMs (FIIO) that started getting issues after 2 months and I have IE600 and HD650 with 0 problems at all. I dropped the 650's many times and the IE600 feel way more sturdy than other cheap plastic IEMs so IMO I'd go for the Senn
Well in terms of resolution/timbre its a significant upgrade but vocals are even beter. Overall (but still in MY opinion) tge HD6X0 is a big step up from something like a beyer DT770. And as the original comment said, for many the HD650 is all you need.