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.
Related Forum Threads
- Catalog scans and ad archive (contributor thread)
Crowdsourced scan quality standards and indexing conventions for source documentation.
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.