active or passive?

Here's an article fromStereophile on the subject:
Up with Stereophile

Most cdp (not all) will have no trouble with that, I have a sony player (xa777) and the krell ksa-250 is 2.2V for full output. I do have transformer PVC which may or may not help out with mine. I have read that the F.T. audio passive also works fine with the krell's with most cdp's. of 2V output. When I spoke to Guy at placette audio he also said his would work fine in my setup (did not try it).

low sencitivity 1.7V for full output power requires the line source to have an adequate or higher which is not often the case...

Marakanetz, interesting answer, mine works great with my ksa-250. The ksa-150 is even better match. What did you base your answer on?

Passive preamp in most cases will not suffice for KSA.

You can use a passive preamp when you have a buffer like an active cross-over IMHO. Otherwise you loose dynamics.

Listening is usually the correct solution to such a question. Unfortunately, it's not always possible unless you live in an area with many high end dealers. The first limitation is that passive preamps do not work well with sources that have a low output level.

You need a nice tube preamp to add some human quality to the music reproduction.