Half-Ass may be fine for most of the feeble-minded.
Passive preamps will of course work with Quicksilver Mini Monos.
You may even say "" my that sounds clear"" but later find you are settling for elevator music in the Dynamics department.
If you have a decent pair of speakers like a Vandersteen 1 Ci the latest matching Quicksilver 1 K preamp w 12AT7 will far better show that piece of music's shadings, subtleties, and proper step up with dynamic graduations that make music come alive.
Best JohnnyR