Eddie Pound:Chebby,
If you used a powerful HiFi amplifier with your Regas rather than a micro system you'd find that they sounded better at all volumes.
A low-powered amp like yours may sound soft, but I think it's your preference, as you lust after outdated BBC loudspeakers too.
Edward
It is a shame I cannot post the review* where the Arcam Solo-Mini was tested with a pair of £2100 Living Voice Auditorium speakers and bowled the reviewers over. I will risk a quote....
"Now that may seem an odd pairing - a £2,100 speaker with a £650
mini-system? On the contrary, we found ourselves drawn inescapably to
the conclusion that, with a budget of two to three thousand pounds, a
Mini, plus the best loudspeakers one can find, it's still an eminently
sensible choice.
After all, the Mini isn't just competent; it is, in context, stunning."
*From a competing magazine.
I can post a link to the 5 star WHF review....
http://whathifi.com/Review/Arcam-Solo-Mini/
and point out that is also a WHF award winner.
Not everyone needs a big powerful amplifier. The OP has expressed a concern about power because he probably has different listening conditions and requirements to me. I just wished to illustrate that the efficient R3's do not need masses of power to perform well at reasonable volume levels. I am sure the Cyrus 6VS2 will be fine.
As for "outdated BBC loudspeakers", many companies (Rogers, Harbeth, Spendor, PMC, Stirling Broadcast) are still doing very well with BBC monitor designs and/or designs evolved/derived from them. However such small monitor types (especially sealed box) are very inefficient (83 - 85db usually) and I would not think of using them with a Solo-Mini. Their manufacturers - some of whom I have spoken to on the subject - recommend class A (valve) designs of around 40 watts or solid state a/b designs up to 100 watt per channel.