Hi,
Mine was the original with 4490EQ chip.
Don't get me wrong, I truly enjoyed the RME and used it for almost 2 years.
It is a wonderful piece for the price. So is the Audio Mirror.
The RME dac is crystal clear & allows "peering into" the music due to the extreme detail.
Also sound could be tailored to some degree.
I did not use an outboard power supply.
From what I read the RME dac has a very sophisticated internal power supply.
I do understand that power supply quality & implementation is a large part of the SQ provided by any dac.
So, I take your point
In fact I did just upgrade the power supply on my Linear Tube MICROzotl amp and immediately noticed a sizable improvement to SQ.
My opinion is that the Toubador just sounds more like music to me.
Of course hat is only MY opinion.
Continue to enjoy the ADI 2dac!