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Product Archive

AX-406A

Three-way active crossover platform using resistor-network programming for custom frequency targets.

Category

Equalizer / Processor / Crossover

Series

Signal Processing

Era

1990s crossover era (manual + archived FAQ context)

AX-406A front view
AX-406A front/product photo showing control layout and I/O labeling.

Specifications

Crossover Topology
Three-way active crossover
Crossover Frequency Method
R-Net resistor programming
R-Net Equation
18,800 / desired frequency (Hz) = resistor value (kohms)
Recommended R-Net Components
1/8W, 5% tolerance (or better) resistors
Package Guidance
14-pin DIP resistor network format

Visual Identification Notes

  • Compact crossover housing with removable resistor-network programming section.
  • Capture DIP/R-Net orientation before replacing custom resistor values.
  • Document all installed resistor values as part of intake notes.

Known Issues

  • Unknown resistor-network values are common on used units.
  • Incorrect R-Net builds can produce unintended crossover points.

Recommended Service Actions

  • Record existing R-Net values before any changes.
  • Recalculate target points from resistor values prior to reinstalling custom networks.
  • Confirm crossover points with measurement equipment after service.

Parts List

    DigiKey Recommendations

      Related Repair Guides

        Gallery

        AX-406A front view

        AX-406A front view

        AX-406A front/product photo showing control layout and I/O labeling.

        AX-406A board detail

        AX-406A board detail

        Open-board view used for reference of filter-network modules and service layout orientation.

        AX-406A reference image

        AX-406A reference image

        AX-406A manual page rendered from archived PDF.

        Historical Notes

        • Signal Processor Manual Baseline

          Archived processor documentation covers EQ-215/EQ-215ix plus EQ-230/EQ-232 equalizer entries, AX-series crossovers (including AX-204A/AX-406A), and Bass Cube hardware, providing a primary-source baseline for specs and restoration notes.

        • LPL44 and R-Net Legacy Guidance

          Archived Accessories FAQ content documents LPL44 wiring guidance and a resistor formula used for legacy R-Net crossover programming.

        Source-Backed Verification

        • Processor manual archive index for EQ, crossovers, and bass processors

          Cross-checked
          • The EQ/DEQ folder lists EQ215 and EQ215ix manuals.
          • The Crossovers folder lists AX406A documentation.
          • The Basscubes folder lists BassCube manual files and supplemental notes.

          Source: Phoenix Phorum Manual Archive - Processors

          Open source page

        • AX-406A resistor-network crossover programming

          Cross-checked
          • AX-406A documentation uses resistor-network programming to set crossover frequency values.
          • Archived Accessories FAQ repeats the same calculation model: 18,800 / desired frequency (Hz) = resistor value (kohms).
          • Both sources emphasize careful resistor-value selection to avoid frequency target drift.

          Source: AX406A Manual (archive PDF)

          Open source page

        Sources / Notes

        • AX406A Manual (archive PDF)

          Primary source for AX-406A crossover programming guidance.

          Open source

        • Archived Phoenix Gold FAQ - Accessories

          Secondary source cross-check for the same 18,800/frequency R-Net formula.

          Open source

        • Processor Manual Index - Crossovers

          Directory listing confirms archived AX406A documentation.

          Open source

        Model Disclaimer Block

        Repair information is provided at user's own risk. Verify all measurements and polarity before power-up.

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