Yep sounds like a studio monitor. It's why I choose not to listen to music via my Neumanns. Both the Neumanns and Hedds are great for mixing because they are boring and flat.
That may be my ultimate conclusion but right now I've got them sounding A LOT better than the dull/boring default. I'm enjoying some music as I type this whereas that honestly wouldn't have been true with them as they were. What Hedds have you used out of interest?
I'm running them ported and full-range currently, and just with tone control adjustments on the speakers used rather than any external DSP (+2 dB treble lift and -2 dB bass cut). I've not measured anything yet.