Wow that is quite the jump (more than 50% - eesh). You sort of get why I like this as an owner though because as the new retail prices rise - I can sell it for what I originally paid. My first two AN products that I bought I sold for more than I paid. I could sell my OTO for more than I paid as well In 2003 it was around $1800 now it's $4000.
Unfortunately, it makes it tougher to buy in. For audio I am fortunate to be in Hong Kong where there are no import duties or taxes. Still the 0.1x was probably priced too low for too long. When the LM 502 CA is $1800US (albeit considerably less in HK) and made with cheap Chinese labour and the 0.1x which sounds better is built in Europe with real wages and benefits, it really should be sold at a higher price. I just wish it weren't because I'd like more people to be able to hear a different kind of CD sound than what is the typical fare. And to hear a tube DAC that doesn't just use a tube like a guitar amp noise generating fattening buffer output. Albeit still usually better than SS OP amp soulless robotic sound.
The Border Patrol DAC SE uses the same chip as the 0.1x and was just reviewed by Doug at dagogo. It lists at $1850 (but it was $1350 not long ago). It does use an analog filter but I liked it at CAS.