Well the Viva is still front and center in my system. I am still using the stock tubes that came with the amp, but I plan on replacing them early next year.
The Viva mates very well with my Daedalus speakers, in its ability to drive them. The speakers sound good at low level listing and when I turn it up, but ….the volume is rarely is past the 9 o clock position. I particular like the fine imaging and rich sound stage which is very evident when listing, so far I have not experienced any compression or lack of head room. I also upgraded my DAC which has not hurt anything, to me, all my core components have good synergy.
No fan of subs in two channel, but I added a pair a few months ago…..thanks to A-gon forum, and this is where… the only thing that I don’t like about Viva…their web site has no information on any spec with their products, and their OM is just as poor. Aside from four line inputs, there an input labeled ‘D’ and ‘S’ with the sub connected to either the line or ‘D’ the subs were okay but the speakers were flat and lifeless. I moved it to the ‘S’ port and bam, the main speakers came back to life. On the plus side my dealer has been great, I have contacted him several times post purchased, including, the rear inputs on the amp, and he has been very responsive and provided detail information and explained what the rear inputs are designed for.