Good day all,
I have had the First Watt SIT2 since 2013. The amp gets played every day for at least 8 hours. It has been driven with an Audiopax Model 5 (the original and the latest incarnation) and a DIY White Cathode Follower OTL tube pre.
In every case and with all music it has bested any of my previous amps to include, Mac, Quad, First Watt F1J, F2J and F4, various 300B (SET), Leben CX300XS, Yamamoto 0A-11, and 0-8s, Transcendent SE OTL, and others of lesser fare. Sometimes not by much, but always better.
The SIT drives a pair of 15" co-axial 100dB speakers in a 15X30 living room and has had many different DAC, CD players and transports, VPI vinyl setup and separate phone pre. As the chain gets better, so does the SIT.
Quite by accident (because I was feeling lazy) while I was changing the equipment and positions in the rack, I decided to temporarily hook my DAC (Audio GD NFB-7 2015 fed through an AP1/PP (latest edition) from a Mac Mini and JRiver) directly to the SIT using the AP1 volume dither.
At low to normal listening levels, I have never heard any amp, at any price present music as well as this combination. The purity is unlike anything I have ever experienced. Whatever is in front of the SIT (given synergistic speakers) is what you are going to hear. If you have a great front end and hi ef speakers, you would need to go a long way to best the SIT amps.