AKG Acoustics Power Supply B 29L User Manual

B 29L  
Power Supply and Mini-Mixer for MicroMic III Series  
Description  
The B 29 L is a small portable power supply/mixer that  
accommodates two microphones in the MicroMic III series  
(except the D 409 L which needs no power supply). Each  
input has a gain control for balancing output levels. The  
device is supplied with a clip that fastens it to a belt or guitar  
strap. It uses a single 9-volt battery, providing an average life  
of 50 hours. The output of the B 29 L can be switched either  
to mic or line output level, depending on the downstream  
requirement. Both inputs to the B 29 L are mini-XLR-F, and  
the output is a standard XLR-M.  
The B 29 L effectively makes one output out of two. It is  
indispensible with small mixers, where it can expand the  
number of available inputs. In addition, many small mixers do  
not have phantom powering. The B 29 L offers an attractive  
solution for this problem.  
Specifications  
Power supply:  
9 V-Alkaline Block  
Current consumption: max. 10 mA  
Battery Life:  
50 h +/- 5 h  
Input channels  
(Mini XLR-F):  
2
Features  
Max. Input level:  
Input impedance:  
Input attenuator:  
Output:  
0 dBV  
5 k ohm  
-50 dB  
• Powers one or two MicroMic  
Series III condenser L-version  
microphones  
XLR-M phantom power protected  
(max. 55 VDC)  
• Provides gain control for each  
microphone  
• On/Off switch with LED status  
indicator  
• Standard XLR male output  
connector  
• Output level mic/line selector  
switch  
Max. output level:  
0 dBV +/- 1 dB @ k < 1% and Ubat  
= 9 V  
Output impedance:  
Gain MIC:  
typ. 200 ohm unbalanced  
0 dB +/- 1 dB  
Gain LINE:  
40 dB +/- 2 dB  
<8 uV (A)  
Noise MIC:  
Frequency response: 20 to 20 kHz  
Temperature range:  
Humidity:  
-32° F - 140° F (0° C - 60° C)  
93% @ 140° F (40° C)  
Size (W x D x H):  
3.7 in. x 2.6 in. x 1.1 in.  
(94 x 67 x 27mm)  
Weight incl. batteries: 4.8 oz. (135g)  
 

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