What I’ve read consistently is that the H390 is warmer. This would disincline me from moving up but perhaps you’d find the 590 more appealing. Jay from Jay’s Inagi recently reviewed the H600 and described its tonality as midway between the 390 and 590.
Whether or nor I utilize all the power on tap from the 390, its warmth (greater then both the 590 and those below it in the line) is not something I’d be willing to give up.I’d actually welcome warming up the system a bit more. I can’t afford to do this now but perhaps will be able to do so in the future.
Thanks for your comments!