Quartet converter (Quatro).

Converter quartet (Quatro) to receive at least four reception levels, being present in the four outputs of converter (27a to 27d) the four reception levels to be received, ie a reception level in each case output converter (27a to 27d), with the following features: - the converter (1) includes an integrated circuit die (1), - the converter (1) includes a bypass circuit (23a to 23d and a switching (37a to 37d), which in at least two or four converter outputs (27a to 27d) can be adjusted and receive at least two or four individually and independently subscribers by switching a first control signal between two supply voltages (13 V or 18V) or by another switching signal dependent frequency control (0 kHz to 22 kHz), independently of the other connected subscribers, in each case one choice of the four reception levels, CHARACTERIZATION ado by the following further features: - there is provided a further circuit by which, when expanded to a converter circuit multiabonado receiver for more than four subscribers, the four converter outputs (27a to 27d, 57a to 57d), necessarily they are switched to a standard or default position (default) in which each of the four outputs of the converter (27a to 27d, 57a to 57d) in each case is assigned one set of the four possible reception and - by circuit additional may further connect one or more switching matrices (55) with a standard allocation to its four inputs (59a to 59d) or four outputs (63a to 63d), forming a converter circuit multiabonado receiver for four subscribers.