Known Issues
- Precise failure modes are still being captured from community service reports.
- Second-hand units often arrive without original installation context.
Product Archive
AX-204A
Legacy AX-series active crossover model listed in the archived Phoenix Phorum crossovers manual directory.
Category
Equalizer / Processor / Crossover
Series
Signal Processing
Era
1990s crossover era (manual index verified)
Specifications
- Documentation Status
- Manual index confirmed; full spec extraction pending
- Archive Document
- AX204A.pdf
- Category
- Active crossover
Visual Identification Notes
- Photograph selector labels and connector layout to support future wiring/reference guides.
- Track board and panel revisions during intake for restoration records.
Recommended Service Actions
- Validate channel routing and crossover behavior before board-level repairs.
- Log measured crossover behavior and any custom network values in service notes.
- Update entry with extracted spec-table values from the manual when verified.
Parts List
Dual op-amp for preamp / crossover stage
Original: Legacy dual DIP-8 op-amp (marking varies by production run)
Replacement: Low-noise audio op-amp DIP-8
Verification: Proposed
DigiKey Recommendations
Audio-grade dual op-amp replacement
DigiKey: P23456-ND
Placeholder DigiKey reference. Verify stability and compensation in original circuit before bulk install.
Open DigiKey reference
Related Repair Guides
- Signal-path noise diagnosis (generic workflow)
Template process for hum, hiss, and channel imbalance root-cause analysis before replacing semiconductors.
Gallery
No gallery items are available for this model yet.
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
No source-backed fact entries are attached to this model yet.
Sources / Notes
AX-204A Manual (archive PDF)
Primary source confirming AX-204A in the archived crossovers manual set.
Open sourceProcessor Manual Index - Crossovers
Directory listing confirms archived AX-204A documentation.
Open source
Model Disclaimer Block
Repair information is provided at user's own risk. Verify all measurements and polarity before power-up.