I've run source directly to amp, not so good, but that was more likely due to a cheap source. I've run a couple of passive systems, good. The last few years have all been active, a bit better.
Passive systems can be really good, but takes a complete dedicated system approach. You can't just slip in a passive pre, and expect it to work. Everything from source, to cables, to amp, the location of all the gear and the lengths of the cables matter a lot. It takes a lot more effort and reduces your options to make a passive system work well. In the end one has to decide if its all worth it. BTW, the way under appreciated Reference Line passive pre's and power amps are IMHO in the top handfull of gear. I've heard them in many different set ups (though for the life of me, I can't remember the details of even one now?) and not only have they never dissapointed, but, have always drawn me in and impressed.
