Great for active instruments like guitars and basses with active pickups and preamps, the MDB-1A active DI features increased headroom and distortion-free operation. Featuring a 1/4" High-impedance input and thru with -20dB pad plus a merge switch that turns the thru jack into a second input, perfect for summing a stereo source to a mono output. The balanced XLR output features switches for polarity, low cut, and ground lift. For maximum convenience, the MDB-1A is powered by 48V phantom power.