User manual AKG C 542 BL

[. . . ] The C 542 BL is an omnidirectional microphone that will pick up sounds originating in front of the boundary only. This has been described in many papers and articles about boundary microphones published over the years. When you place the microphone on a large acoustically reflective surface (boundary), its sensitivity will be about 6 dB higher than that of conventional omnidirectional microphones. [. . . ] (Refer to the instruction manual of the unit to which you connected your microphone. If your mixer provides no phantom power, connect an optional AKG phantom power supply (B 18) between the microphone and the mixer. Using any power supply other than those recommended by AKG may damage your microphone and will void the warranty. 4 Unbalanced Input You may connect AKG phantom power supplies to unbalanced inputs, too. Use a cable with a female XLR connector and TS jack plug: 1 Introduction Boundary microphones are inconspicuous and easy to position. Therefore, the C 542 BL is an excellent choice for working with people who tend to shy away from microphones and applications where no microphone must be visible for visual or esthetic reasons. The following sections contain hints on how to get the best possible results. On the XLR connector, use a wire bridge to connect pin 1 to pin 3 and the cable shield. Note: Unbalanced cables may pick up interference from stray magnetic fields near power or lighting cables, electric motors, etc. This may introduce hum or similar noise when you use a cable that is longer than 16 feet (5 m). The easiest technique is to place the microphone on the floor about 7 to 35 feet (2 to 10 m) away from the sound source. The ultimate working distance will depend on the physical dimensions of the sound source(s) to be recorded and the specific situation at the recording location. Alternatively, you may use an acoustically reflective wall (covered with no wallpaper or softboard) near the sound source. Deadening of structure-borne noise, we recommend leaving the rubber feet inside the holes. [. . . ] 6 Bass Cut Filter Low-frequency rumble or wind noise from sound sources we do not normally perceive as irritating, such as air conditioning, traffic, or structure-borne noise, may become clearly audible and therefore definitely irritating on a recording. The 150 Hz bass cut filter integrated in the phantom power adapter allows you to reject this unwanted noise without changing the sound of the instrument or voice you are recording. You can clean all metal surfaces with (industrial grade) methylated spirits or alcohol. [. . . ]