Designed for permanent stage floor installation, the 174SLBK ACE Stage Pocket System accepts one expander unit and two, 3 gang plates for convenient on stage access to both digital I/O and additional customized connectivity. Compatible with either the Allen & Heath DX(DT)164-W or DiGiCo A164 expander unit, this contemporary floor box purposely moves digital connectivity from a wall installation, directly into the stage floor where it is most conveniently accessed.