ELTIM Pre-2U buffer modules

With the buffer modules listed below, you can improve the quality of a Pre-230 or Pre-330 Preamplifier module.
While using them, you change it from a passive Preamp into an active version actually.
The dimensions are exactly matching the depth of MODU 230mm deep cabinets if mounted like this:
The cabinet has to be at least 80mm (=2U) high.