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Product Archive

LPL44

Remote low-pass level control accessory for bass adjustment from the cabin when low-pass crossover mode is active.

Category

Equalizer / Processor / Crossover

Series

Legacy Accessories

Era

1990s accessory guidance (archived FAQ source)

Specifications

Primary Function
Remote bass level control for low-pass channel
Cable Type
RJ11 4-conductor phone line (legacy implementation)
Back-Side Wiring
Left = Black, Center = Red + Green, Right = Yellow
Operational Requirement
Low-pass crossover must be activated
R-Net Legacy Formula
18,800 / desired crossover frequency (Hz) = resistor value (kohms)

Visual Identification Notes

  • Small dash-mount dial controller, usually paired with PG low-pass-capable amplifiers.
  • When documenting units, capture front dial face and rear solder point orientation.
  • Include cable-end photos when recording field wiring repairs.

Known Issues

  • Incorrect RJ11 rewiring can invert control direction or disable expected operation.
  • Many second-hand controllers have undocumented cable modifications.

Recommended Service Actions

  • Confirm wire mapping before reconnecting legacy RJ11 cables.
  • Verify control direction after reassembly and adjust if left/right conductors are swapped.
  • Validate operation only with low-pass mode engaged on the host amplifier/crossover.

Parts List

    DigiKey Recommendations

      Related Repair Guides

        Gallery

        No gallery items are available for this model yet.

        Historical 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

        • LPL44 and R-Net accessory guidance

          Imported - Needs Primary Verification
          • LPL44 is described as a remote bass level control that works when low-pass crossover mode is active.
          • RJ11 repair guidance lists left = black, center = red+green, right = yellow at the LPL44 solder points.
          • The archived formula for crossover R-Nets is resistor value (kohms) = 18,800 / target crossover frequency (Hz).

          Source: Archived Phoenix Gold FAQ - Accessories

          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

        • Archived Phoenix Gold FAQ - Accessories

          Primary source for LPL44 function, wiring map, and R-Net resistor guidance.

          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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