Note:
Important!
Fig. 4: Circuit using
an input transformer
with a center tap
(floating).
Fig. 5: Circuit using
an input transformer
with no center tap
(floating).
Table 1: Feeding
resistor to DIN/IEC
This section applies to both the C 414B-XLS and the C 414B-
XL II.
The C 414B-XLS and C 414B-XL II provide extremely low self-
noise yet high headroom. The only way to meet these strict
engineering requirements was to limit the powering options for
both microphones to 48 V phantom power to DIN/IEC only. This
standard requires a positive voltage of 48 V with reference to
the cable shield.
Do not connect the microphone to any power supply other
than a phantom power source (input with phantom power
or external phantom power supply) to DIN/IEC with a float-
ing connector, using a balanced cable with studio grade
connectors to IEC 268-12 only. This is the only way to
ensure safe and reliable operation.
We recommend the following methods to add phantom power
to microphone inputs:
To satisfy the symmetry requirement, use resistors with 0.5%
maximum tolerance for 2 x Rv.
2 Powering
19
C 414 B-XLS / C 414B-XL II
Standard value for Rv (or 2 x Rv)
V DC
Rv
2 x Rv
48 V ±4 V
3300 ohms
6800 ohms
4744_C414B_cb 23.09.2005 10:16 Uhr Seite 19
