I really like using passive pre amps. I do think for them to be effective one of the most important things is amp matching. I have used a passive with monarchy SM 70 amps and the results were amazing. I also use them with McCormack amps with the same results. I see folks say they are not as dynamic and to me I get the opposite effect. I hear the music only and it seems to be more alive. This is with the right amps. I was curious what others have found using passive pre amps.