Have you a/b'd Khan passive mode to other passive DI's? If so, your thoughts?
I would need to do some more A/B-ing later to give you a real definitive answer with adequate description of the differences.
But here's what I gathered from trying it briefly yesterday: The only passive DI I have at the moment is the Radial SB-2. It has served me well for months, for what I knew. It's solid, reliable, and sounds good in my headphone setup. It's passive and there is significant volume cut, because it's passive, which enables me to use it with my Rolls PM50, which farts out with hotter signals and with the Khan in active mode. There is some high end roll off with the SB, which is expected, but not drastic.
It's hard to go back and forth between the SB and the Khan multiple times, because it involves several setup changes. But the first time I tried the Khan, I knew it was in a different league. (And rightfully so, considering the SB is $70 and the Khan is $700.) The Khan in passive mode is a bit warmer, a lot clearer, and tighter sounding. (For lack of a better description). I feel like I am hearing the full range of my signal, including all of the bits that I didn't know were missing with the SB. Especially when I plugged my passive jazz straight into both of them. My jazz bass seemed to sound more distinctively like a jazz bass. It's character came through better, when the full-range signal was allowed through. And it brings more nuances out of my different preamps. I'm able to hear more distinctions between them. Like, each preamp sounds more like itself, and therefore more different from the others, when comparing an SVT preamp to a Fender-esque preamp, for example. Most importantly, it sounds so good it makes me want to play more.