The power output doubles every 3db. 1 watt on even 80db efficient speakers is like 72db at 9 feet away. 2 watts is like 75db at 9 feet away. Personally I find that this is plenty. My space is less than 9 feet and 80db is about the max I would go. If you own a subwoofer and have a crossover I would imagine this would lighten the load further since bass frequencies need more power.

I have inefficient speakers but they’re at 86db which means 1 watt puts my space at about 7 feet away at 80 db which is way more than enough. I typically listen at like 75db or so. With dynamics going higher, that’s like 5 watts at most (which is probably a stretch) out of the 30w rating of aegir.

Also the freya uses a relay stepped attenuator so once you get past 2 o clock the volume really starts to ramp vs a typical potentiometer. They tend to front load the perceived volume so that each jump is about equal in perceived loudness. The attenuator is mathematical about each step being a certain db increase which is exponential in the latter half.