Bass is greatly improved which is a surprise to me since I am still using the onboard plate amps in the Presence. One would not expect there to be any influence exerted by the introduction of the Mirrors but there is. There is more snap and snarl to the bottom notes and more complexity in the churn of the lowest octave or so. Not only does it sound different but it feels different as well.
The midrange moved a little closer and gained a lot of color.
There is more flesh on its bones and more lilt in its tones.
You should know that these amps are not stock, however. I bought them from Undertow and he replaced all the stock Solen caps with Jantzen Superior and sourced NOS tubes. The outputs are RCA and the input tubes are Tungsol. Not sure what the driver tube is. He even included Isoclean fuses.
I'm very glad nobody bought my Presence speakers. Zu has a winner there and this combo seems like a perfect match.
Single ended triode and single driver is about as simple as you can get. I'm verypleased with this change. Most of what I have done lately has been rather lateral. This one is a clear step up. Thanks for asking.