Radial Engineering ProDI Mono Passive Direct Box Pro DI Radial Transformer

NIOB Radial Engineering ProD2 Passive Stereo Direct Box - Professional DI

Pyle Professional High-Performance Passive DI-Box-(1/4''/XLR) Direct Box

PROformance Direct Box DI Box High To Low Impedance Transformer

Pyle Premium Direct Injection Audio Box - 2.36" X 4.09" Passive DI Unit Hum Elim

Boss DI-1 Active Direct Box Products of Roland with Box from Japan

Dual Z Direct Passive Di Box High Performance Audio Isolation Transformer

Rapco Horizon DBBLOX Hi to Lo Z Transformer Direct Box