The pro2900 could be an excellent choice imo but has a slighlty smaller soundstage.

  Quote: From reviews, the HFi580 has more punchy bass where the pro550 has more soundstage.     Quote: The xb500 has more punchy bass but the overall SQ is much better concerning the HFi580.

  Quote: The ST/STX has amphasized bass.   Quote:   Its true for the HD518 but its still better than a smartphone

  Quote:   Yes, exactly.     Quote:   The DT990 is very particular, i not a big fan of V shaped headphones like the pro900/DT990 for music, too much recessed mids and treble.    DT880 imo, is a much better headphone (for my tastes), more balanced, but in comparison with...

  Quote: Maybe the HFi780, excellent for rock and very good isolation.

Hum, a lot of them, maybe the W1000x but i know that the HD800 ll be the next number one soon,lol.

  Quote:   Like "nikp", we must know what you like in the HD598 and what are your genre of music to propose you other headphones.   There is a lot of headphones in the 500$ price range that are technically better than the HD598.   But if you like a relatively bright headphone...

Which type of isolation? passive or active?   With passive isolation, the HD380pro is good but have a strong clamping force, with active isolation you can have less clamping force, but are often heavier headphones and some peoples don't like noise from active isolation headphone.

The W1000x imo, beautiful, wonderful voices and a very fun headphone imo.

  Quote:   Quote:   The srh750DJ could be a good choice for you.

  Quote:   HFi780 or srh840 imo.

We have all different methods,lol.   Mine is listen to all genres of music continously during 50 to 200 hours depending on headphones.  Every 24 hours i increase the volume but never too loud.

The HFI780 has slightly more soundstage, better quality bass (HFI580 has more punchy bass) and more refined/detailled mids. Treble are better but more extended.

Well, when you do a burn-in you must begin slowly, not loud with a max of bass for example. You have the same problem with all your others songs? Its maybe a problem with your amp too.

  Quote:   I m a mid centric headphone lover, that's why i like them :) and i have no problems with all my HiFi amps or headphone amps, all are SS amp, maybe you are very sensible with treble.