The ADB2 is powered by standard microphone phantom power from 9-48 VDC and uses a discrete low-noise differential driver to make it very quiet. The ADB2 has two 1/4" Input jacks wired in parallel, a male XLR Output and a 3 position attenuator and ground lift switches.
ADB2 Specifications:

• Input -10 to +40 dB unbal
• Output -10 to +2 dB bal XLR pin 2 +
• Bandwidth 1 -50K Hz
• S/N 100 Db
• Jacks (2) 1/4" phone, XLR Male
• Attenuator 0 dB, 20 dB, 40 dB
• Power9 -48 V Phantom
• Size 2" X 3.5" X 1.23"