Here are some impressions and my playlist. It's currently a toss-up but slightly leaning away from the 8361a.
With the Philharmonic HTs, I perceive and prefer the wider soundstage and a feeling that the sound is more ‘live’, moving and atmospheric. To me the sound is lighter, a bit spread out and pleasantly diffused. It improved some older, shit-production, hardcore-punk recordings. The HT’s have energy that is missing in the Genelec monitors.
What I am hearing is consistent with a wide directivity tweeter like the one on the HT Tower. Early reflections? Whatever it is, I like the effect a lot. My wife also consistently preferred HTs, which we have been using as our primary home system. (We may have developed a preference for the sound of the HT Towers.)
If there are negatives, the HT sound was a bit thinner and sometimes vocals feel a little recessed compared to the Genelecs. I also think it is harder to find an ideal speaker placement with the HTs. The perfect sweet spot is small.
By comparison, the Genelecs were much less fussy to position but had a somewhat smaller soundstage and a more refined presentation. The stereo center was consistently more focused and identifiable, which often made vocals feel ‘in-room’ and closer. The overall presentation felt very smooth and controlled but not pressured or closed like the way some describe monitors.
Clarity seemed better on the Genelec. I felt like I could more easily pick out details of instruments, locations and individual sounds in the music with the 8361a’s. I liked it a lot. That might be the necessary trade-off for the loss of the big soundstage of the HT’s.
This smaller soundstage does not make the sound feel small at all, in fact the room feels ‘fuller’ despite the 8361a’s narrower directivity. I felt more enveloped. I thought it might just spl, so I took 3db off the Genelecs and it was still there.
As far as power, they are both in the same range i.e. more than I need. I got the Genelec protection light to come on playing Billie Eilish ‘Bad Guy’ around 100db 6 feet (with ear protection.) The double 6.5” Purifi woofer on the HTs are rated 90db and they get loud. On them, my spl meter says 100-105db at same distance (with ear protection) from a ncx500 and I don’t hear any clipping. My sense is the Genelecs had some more to go but I didn’t go further. If I had to, I would say the Genelec sounded better (more balanced, effortless) at that high volume. Not that it matters.
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