User Guide

2 Powering

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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 re-

sistor to DIN/IEC

The C 414 LTD provides extremely low self-noise yet high head-

room. 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 posi-

tive 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 floating

connector, using a balanced cable with studio grade con-

nectors 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.

20 AKG C 414 LTD

Standard values for Rv and 2 x Rv

V DC Rv 2 x Rv

48 V ±4 V 3300 ohms 6800 ohms

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6411_AKG_BDA_C_414_LTD_FS 19.12.2006 8:12 Uhr Seite 20