MP-1 Microphone Preamplifier
User Guide and Technical Documentation
page 8
Batteries
The MP-1 is designed to operate on two AA alkaline cells for approximately 26 hours with typical sig-
nals (without phantom power). The audio performance of the MP-1 does not vary throughout the life of
the batteries.
Many factors affect battery life including—battery chemistry, ambient temperature of operation, phan-
tom voltage, microphone current draw, and output drive level. The chart below can be used as a starting
point to estimate battery life. Experimentation is recommended to determine battery life for each indi-
vidual setup. Note: Nickel-Cadmium batteries are not recommended in the MP-1 since these batteries
have lower energy per cell than other types and will result in very short service.
Battery Type
Microphone Type
Battery Life
Duracell AA MN 1500
Dynamic handheld
26 hrs.
Duracell AA MN 1500
Electret condenser, 12-volt phantom
18 hrs.
Duracell AA MN 1500
Studio condenser, 48-volt phantom
5 hrs.
Test conditions: 70 F, 42 dB gain with music source, 600 ohm load, +4 dBu output
Limitation of Liability
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FCC Statement
This device has been tested and found to comply with the limits for a class B digital device, pursuant
to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses, and can radiate radio fre-
quency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in
a particular installation.
