The JuicedLink BMC388 is a feature rich low-noise preamp, which can enable you to reduce the audio "hiss" from your camera. It has 3 XLR inputs and 48V/12V phantom power, meters, and locking balanced as well as unbalanced outputs. It is built tough, and refined to provide the best power efficiency, smallest size, and lightest weight. It incorporates sweet features such as Audio Bracketing (for camera overload protection), Selective Power-Down (to extend battery life).

-For Blackmagic Cinema Camera + Others
Features

3XLR input low-noise preamp
2 balanced outputs, amplified mic level, 3.5mm minijack (locking)
1 unbalanced stereo output, amplified mic level, 3.5mm stereo minijack (locking)
4 Segment R/L meters (each), which can be calibrated to camera
Super small and light: approx 8oz, 3.4" x 3.7" x 1.5" in an aluminum enclosure
Camera overload protection - Audio Output Bracketing
48V phantom power, and power saving 12V phantom mode
Power
Switchable between Alkaline and LiPoly 9V battery use
Selective Power-Down mode to turn off portions of the preamp not being used
Battery Life Estimates
​~6hr battery life (no phantom, all 3 XLR inputs active, Alkaline battery)
~12hr battery life (no phantom, 1 XLR input active, Alkaline battery)
Approx 30dB max available gain
Approx +0dB / -1.5dB frequency response from 20Hz to 20KHz
MIC/LINE Switches
HI/LO Gain Switches
MONO/STEREO Switch