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Silver aluminium direct box with black front panel, input jack, output XLR and ground-lift switch

Warm Audio

Warm Audio WA-DI-P Passive Direct Box

SKU CH-0S5E-1MEYQ

Passive direct box with custom-wound CineMag USA transformer converts instrument signals to balanced mic-level without degradation

  • Custom-wound CineMag USA transformer preserves instrument tone without degradation
  • Converts instrument signals to balanced mic-level for direct preamp connection
  • Discrete Class A circuitry with gold-plated traces maintains signal integrity
  • Rugged extruded aluminum chassis withstands heavy studio and road use
  • Frequency response exceeds typical passive DI boxes for active and passive pickups

What It Is

The Warm Audio WA-DI-P is a passive direct box built around a custom-wound CineMag USA output transformer. It converts high-impedance instrument signals to balanced mic-level output without active circuitry. The unit suits electric instruments with active electronics and also handles passive pickups with a wide frequency response. Rugged aluminium construction protects the Class A discrete components and gold-plated circuit board traces for stage and studio use.

Before You Connect

Verify that your instrument has an active preamp or pickup system for optimal impedance matching with this passive design. Ensure your mixing console or audio interface provides a microphone preamp with sufficient gain for the transformer’s output level. A standard XLR cable is required for the balanced output, and a 1/4 inch TS cable connects the instrument to the input. The ground-lift switch can be engaged to resolve hum caused by ground loops between equipment.

Under Continuous Use

The passive transformer topology introduces no active noise floor and requires no phantom power or batteries, so performance remains consistent over unlimited operating periods. The extruded aluminium chassis acts as a heat sink for the transformer, preventing thermal saturation during long sessions. Signal integrity and tonal character are maintained across extended cable runs because the balanced low-impedance output rejects induced interference without degradation.

Highlights

  • Custom-wound CineMag USA transformer preserves instrument tone without degradation
  • Converts instrument signals to balanced mic-level for direct preamp connection
  • Discrete Class A circuitry with gold-plated traces maintains signal integrity
  • Rugged extruded aluminum chassis withstands heavy studio and road use
  • Frequency response exceeds typical passive DI boxes for active and passive pickups

Specifications

No published specifications for this item yet.

Questions about this item

What comes with the WA-DI-P and do I need any extra cables?

The passive direct box ships as a single unit with its custom-wound CineMag USA output transformer and rugged aluminium chassis. Instrument and XLR cables are not included and must be purchased separately.

Should I choose the passive WA-DI-P or the active version for my instrument?

Select the passive WA-DI-P for instruments with active electronics such as active basses or keyboards; it also performs well with passive pickups. Choose the active model for purely passive instruments requiring impedance matching and signal boost.

How does the CineMag USA transformer affect the signal in a real recording chain?

The custom-wound CineMag transformer converts high-impedance instrument signals to balanced mic-level output without degradation, preserving warm, rich tone even over long cable runs into any mic preamp.

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