API1970sEqualizerEqualizer$$$Premium($800–3,000)
API 550A
Engineers wanting API's punchy, forward EQ character for tracking or mix-bus coloration.
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Strengths
- Discrete 2520 op-amp gives a punchy, forward character that cuts through dense mixes
- Stepped (rather than continuous) frequency selectors make settings repeatable and fast to recall
- Proportional-Q design keeps boosts/cuts musical without extra bandwidth controls
Trade-offs
- Stepped frequency points offer less surgical precision than fully sweepable parametric EQs
- Only 3 bands limits complex multi-band correction in a single unit
Full Specifications
| Specification | Value |
|---|---|
| Brand | API |
| Model | 550A |
| Era | 1970s |
| Typical Price Tier | Premium ($800–3,000) |
| Device Type | Equalizer |
| Circuit Type | Discrete Class-A active EQ (2520 op-amp) |
| Channels | 1 |
| EQ Bands / Ratio Range | 3-band, stepped frequency selectors, ±12dB |
| Rack Size | 1U |
| Sidechain Input | No |
A relative used-market guide, not a live quote — real prices vary by condition, region, and timing. Check the Reverb/eBay links on any item for current listings.
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Match Score Explorer
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This deckAPI 550A
Match57
Flexibility58
Ease of Maintenance55
Ease of Use70
Tonal Neutrality45
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Maintenance & Supplies
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