What is the best type of preamp for a class D amp?

Listen to a bunch of different preamps and pick the one that sounds the best.

Many far more technical than me say none yet can be called true hiend, as technology is not yet developed to allow the switching frequency of Class D to be high enough which then has to be filtered out at the end, and that filter not to have an audible/measureable effect on the upper mids/highs of the audio spectrum.
And they also need to be able to drive low impedance loads at high frequencies, which they have trouble with at the moment.

But they do make great bass amps.

Cheers George

No such thing as a class D preamp
alan

Lots of reviews of the amp see what they liked. What you like may be quite different but I like tube pre amps with all power amps. In this situation it would seem almost a prerequisite.

The reviews that I read suggest using a tube preamp. One suggested an E.A.R. 868. So be sure to try them in your auditioning.