Whirlwind MLTDIR MultiDirector 4-Channel Passive DI Rack Unit

The Whirlwind MLTDIR MultiDirector is designed for audio engineers and system integrators who need reliable, passive direct injection across multiple channels without dedicating separate rack space or power to each unit. By consolidating four Director-series passive DI circuits into a single 1U rack module, the MLTDIR is a practical solution for stage racks, front-of-house rigs, and installed AV systems where rack real estate is a premium.

Passive operation means the MLTDIR converts instrument or line-level signals to balanced mic level entirely without external power, eliminating the need for power supplies or phantom management for the DI stage. This makes it particularly well-suited for touring applications where setup speed and signal reliability under variable power conditions are critical. The four independent channels operate without crosstalk between them, supporting keyboards, playback systems, or any unbalanced source that needs to feed a professional console.

For integrators building permanent installs — houses of worship, theaters, or corporate AV systems — the 1U format integrates cleanly into standard equipment racks and eliminates the maintenance overhead associated with active or powered DI banks. Compared to active DI solutions, the MLTDIR's passive design removes a potential failure point and keeps the signal path simple and consistent.