campbrs, you appear to be asking a Schoeps question in a Neumann thread, but the answer is "no." Schoeps active cables run at relatively low impedance, so there is no discernable loss at the juncture of a Lemo-equipped cable and an adapter with a Lemo socket, such as the Schoeps ALC 0 accessory that can be attached to a CMC amplifier or for that matter, the input of a "LemoSax" preamp.
Strictly speaking Neumann's extension cables for their KM 100 series aren't "active" since the first FET stage is in their "active capsules" (AK 40, etc.), but the circuitry still runs at a relatively low impedance. If that were not so, it could be prone to hum and RFI pickup as well as high-frequency losses.
At the time Neumann introduced their KM 100 series--including the extension cables, goosenecks and other accessories that can go between the capsule and amplifier--the Schoeps patent on active accessories was still in force. To their credit, Neumann honored that patent by approaching the problem in an original way. Other manufacturers have not been so honorable, unfortunately.
--best regards