Rowland 625

Clavil, no clicking output to speakers when power switch is cycled on/off/on. Don't worry about the resolution of the 625. It will way outperform the 312!

There was a question re the Corus pre-amp. I have owned the Corus for two months following an upgrade from Synergy IIi.
As compared to the Synergy, the Corus is more transparent, quieter, images more precisely and has deeper cleaner bass.
I really enjoyed the Synergy IIi which was I felt was very musical despite being fairly neutral. In retrospect I think the Synergy emphasized the mid-bass a bit as compared to the Corus which simply goes deeper without undue emphasis anywhere across the frequency range.
One caveat is the long run-in time – 1000+ hours – I was concerned when I initially plugged the Corus in and it sounded a bit “off”. Fortunately Guidocorona impression’s of the Criterion break-in was helpful. Also see search the very helpful JDRG Knowledgebase for “break-in”.
If there is one word the sums up the sound of the Corus to me it is “holographic” – in terms of providing precise 3D images that surprises by revealing the normally hidden music nuances.
BTW, the design of Corus is virtually the same as the Criterion except for the absence of battery power supply (compare internal pictures of the Corus and Criterion). I bought the Corus (without opportunity to audition) because of it’s overall mix of features (dual pre-amp paths),close to state-of-art JDRG preamp design and positive reviews of Criterion (assuming that the Corus is a very similar design). Fortunately the Corus has lived up to expectations.

For what I have read, I'll keep my Model 312, because I don't want to use the 625 to make coffee in the morning, listen to the news in my tuner and drinking coffee before go to work. As usual.
And the sound will not beat the sound of my Model 312/500 watts with dCS Paganini and Criterion. I use Nordost Odin power cord, IC Siltech Empress Crown and for speakers the Stealth Dream V10T.
As Clavil said the 3D is outstunning.

I can buy anything I want, but I'll keep the Model 312.
In my opinion we have the luck to leave in the same time that Jeff Rowland projected the 312.
This device will be legendary in few years.
As Jeff Rowland said, the Model 312 is the joy of my life.
It's true, man.

But I have just one consideration, I mean the Criterion, because Fernando Andreti review the DartZeel preamplifier and wrote wonderfull things about this device, and even said the DartZell beat his top of the line Accuphase and he bought one DartZell.
Let's see

That is exciting Isvaldo, DartZeal makes extremely fine sounding devices. if you ever have the opportunity of comparing Criterion and the DartZeal pre side-by-side, please let us all know your impressions. G.

it would also be fascinating to have an oportunity to compare the Criterion to FM Acoustic and Viola !