Hi.
Personally, initially I had the same feeling in my 45 m2 and 145 m3 room with the SN2 and K6…, until the system, and especially the integrated, was settling down and I went fine tuning and tweking it…
On the SN2 I can say that its 130W in 4 Ohms and its power supply delivery are better than the 420W in 4 Ohms and the power delivery of my previous Exposure 3010S2 combo, insufferable with the K6; and no point of comparison in terms of bass control. Then, it shouldn’t just be a matter of power, because the power without control…
The reviews and tests that were done at the time, and I have been able to read, on the SN, are quite coincidental in its bass deficiency, especially its lack of control of the bass frequencies. This was completely remedied with SN2, and with SN3 it appears to have been further improved. I will personally experience it shortly, because I am waiting for a SN3 new brand unit after the shocked and strange fault from my SN2 unit (I hope it will finally arrive this week, and be able to have it all in place next week); but I don’t find any lack of bass control problems with SN2 into K6, and they should certainly get even better on SN3. Actually, until well past 90 dB, almost 95 dB, just wonderful, no mullet, as some point from a distance. I have not worn it louder, because really there are already many decibels and I find it annoying; besides, you know, excess power without clipping is usually paid dearly, both in terms of burnt woofer coils and, worse, in chronic deafness, which with youth is not appreciated, but over time you usually miss the second chance…
That said, with the specifications on paper, there does not seem to be as much difference between H 40.1 and K6, as the lower sensitivity of the former is fairly compensated by their higher impedance and, consequently, less need for power supply delibery.
It seems that Hegel makes good devices, although it also seems that his after-sales service leaves much to be desired, it is quite distressing, to put it mildly. To my taste, a point too cold and analytical, and not as musical as Naim; although, beyond its musical characteristics, it was his defihic after-sales service that deterred me from the brand. Since the failure with the SN2, no problem and direct change by a new brand unit of SN3, though, yes, still waiting for the new unit… Would it have been the same with Hegel…? I don’t know, but judging from the experiences out there, probably not.
If I were in your shoes, I think I’d try to test the SN3 with those speakers; it’ll probably surprise you. Although unable to demo it, I might think of ATC SIA2-150 or, better, McIntosh, the MA6700 is not far away in price target, and it seems it’s a real marvel with your speakers.
Anyway, cheer and luck.