all right, I will share my impressions gradually.
fist off, the anxiety about 'power': this is my first tube amp, and a single-ended, low-watt amp at that, so naturally I was unsure what to expect. my room is about 3 on 4.5 meters and I sit about 2 m from each speaker, with a bit less than that between the speakers, so close to near field. speakers are Triangle Titus Ez which are rated at 90 dB I believe, so not the most efficient speakers, but they are recommended time and again for their supposed tube-friendly demeanour. I like to listen moderately loud. with all that, I get the loudness I like at 9.5 volume dial, by 10 it gets uncomfortable, and in night time, when the background is quiet, I turn it down to 9-8.5. so, no need to worry here. I have to mention that when I turn down to 8 or a bit below, not only it gets quieter, but the juice seems to be sucked out of the sound, as if someone covered the speakers with a blanket.
the amp came with the Chinese 6L6 variant output tubes which I found too bright, Ruby EL34 improved things considerably, however if I am honest, it's still a touch too bright for my taste, and probably brighter than when I drive the Tituses from old Harman HK620 I own. I am really hoping this to improve with burn-in and perhaps different tubes. yes, the Tituses themselves are pretty bright, my room is bright, and I am treble-sensetive, so a bit of a complicated situation here.
all, right, in terms of sound stage - the Tituses are really something. I have to mention that this is my first pair of 'serious' speakers, so I suppose I am still enchanted, as I have never heard anything like it before. deep, wide, layered, with great separation yet with everything working together and not falling apart. this was my experience with HK620. I was told that with tubes driving the Tituses I will be in the 'soundstage country', but I am yet to experience that. out of MP-301 the soundstage seems a bit constricted, especially front to back, and while there is separation, there is less air between the instruments. the sound however is more refined compared to HK620 and has this strange quality of 'filling the room'.