Ok so I changed my mind. That didn’t take long...
The Rega Brio is a common but good class a or ab type amp it looks like with what looks like a fairly standard spec compared to the cyrus. Contrary to what was said in this thread, the cyrus is much more powerful. At 6 ohm type loads the rega outputs around 60 Watts per channel whereas the cyrus outputs 100 Watts, so it’s nearly double the power. Presumably the less heat the amp produces equates to even more efficiency so there is no doubt the cyrus is more powerful.
the cyrus uses class d amplification which is much more efficient and the case won’t get hot, but class d can to some tastes produce an undesirable sharp sound quality, compared to traditionally considered smoother class a amplification. It will very much depend on the speakers and the combination of course (smooth speakers with class d may work to some tastes eg cyrus stereo 200 and pmc 20-23) .
Whereas the rega states it has a few power supplies in its description, the cyrus has 11 separate power supplies to “maximise separation to different circuits”.
In addition to the moving magnet phono stage and headphone amp which both amps have, the cyrus has Bluetooth. Whilst not required by the op, it could be used in the future. Also the cyrus has dual binding posts for potential bi wire or bi amp applications if your speakers suit, depending on your views of bi wiring and amping. In addition the cyrus has pre outs for connecting up a future power amplifier if you want to upgrade in the future. Cyrus’ r and d manager David Marato hinted at a recent roadshow I went to of a new component to partner the one being in the pipeline, and it’s conceivable that they may make further components like streamers etc, in the ‘one’ affordable range. I suspect the one case is going to be the new cyrus case accross the board. the rega doesn’t have pre outs so it’s upgradeability is limited. There is also a firmware upgrade socket in the one for new features being added. Both have headphone sockets with an ab headphone amp I think, and both are at a similar price. The cyrus has a linear power supply.
I know that the cyrus one uses speaker impedance matching as apparently it’s difficult for class d amplifiers to produce the same frequency response to speakers of different impedance. So when you switch the one on it detects the speakers impedance and varies the signal accordingly.
Now onto sound, I heard the Brio on some spendors at a show and it was working very well, but the cyrus one was working with very big speakers and really coping well too. Clearly the demo was to show off how good class d can work with driving bigger and more demanding speakers. Now I must admit I haven’t heard the amps side by side with the same speakers, but on paper at least the cyrus appears much more capabale in sound quality and specification with it’s more efficient powerful amp. I know that they used the specification of the £1750 stereo 200 class d amp to develop the one, and the stereo 200 is a very nice amp. So not that I’m being brand loyal to cyrus just because I own their stuff, but I would expect the cyrus to beat the rega. More power gives more room for clarity, and the dynamic shifts of the music too making it more real. Also imaging and soundstage - a bigger sound.
which got me thinking, why have what hi rated the cyrus one with less dynamics than the Brio in their review, when on paper the cyrus is much more powerful and the cyrus class d is very much more dynamic than cyrus basic ab amps like the x power. That’s a comment I’d be checking out in comparative tests of the Brio and cyrus one if I had these on my list. Whilst what hi speaker reviews are more often than not bang on the money, their amp reviews are sometimes not but I geuss it’s much harder to get it right for amps, bearing in mind speakers mostly ‘do the most of the sound’ and the issues with compatibility.
But at the end of the day all that said, much comes down to taste and essentially the speakers being used. But I’d urge anyone comparing these two, to have a listen to things like clarity and dynamics, and soundstage etc, and buy on the qualities of the sound and not first impressions. To me bearing in mind the specs and performance, with the right speakers that suited both amps, I’m sure the cyrus would win in a comparative test against the Brio