{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "API 550b 500 Series 4-Band Equalizer Module",
    "brand": "API",
    "model": null,
    "mpn": null,
    "gtins": null,
    "handle": "gm-api-550b-api-550b-500-series-4-band-equalizer-module-958d1707",
    "url": "https://envoy-music.myshopify.com/products/gm-api-550b-api-550b-500-series-4-band-equalizer-module-958d1707",
    "catalog_product_id": "reverb_listing:95516957",
    "lane": "studio",
    "product_object": "4-band equalizer module"
  },
  "offer": {
    "price": 1300.12,
    "currency": "CAD",
    "available": true,
    "condition": "Mint",
    "price_band": "high",
    "source_verified_at": null
  },
  "specifications": {"type":"json","groups":[{"name":"Product facts","fields":[{"label":"Low","value":"30, 40, 50, 100, 200, 300, 400Hz","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"Audio resolution","value":"1Khz","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"Connectivity","value":"USB","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"{\"handle\"","value":"\"550b\", \"classification\": {\"lane\": \"studio\", \"action\": \"keep\", \"reason\": \"retailer taxonomy\"}, \"catalogListingId\": \"studio_economik:10123020796223\"}","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"Specifications Number of Bands","value":"Four","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Filter Type","value":"“Low” and “High” bands are Peak\/Shelf switchable. Low-Mid and Mid-High are peaking type","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Filter Frequency Centers","value":"Low: 30, 40, 50, 100, 200, 300, 400Hz Low-Mid: 75, 150, 180, 240, 500, 700, 1Khz Mid-High: 800, 1.5K, 3K, 5K, 8K, 10K, 12.5K High: 2.5K, 5K, 7K, 10K, 12.5K, 15K, 20K","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Filter Boost\/Cut","value":"±12 dB","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Filter Slope","value":"12 dB per Octave","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Input Impedance","value":"18.5 K +4 in, 7.5 K -2 in","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Output Impedance","value":"Less than 75 Ohms","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Nominal Levels","value":"-15 to +15 dBu","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"}]},{"name":"Format and size","fields":[{"label":"Dimensions note","value":"4 in, 7","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"Size","value":"1.5″ X 5.25″ X 7.5″ Deep","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Size (Boxed for Shipping)","value":"4.5″ X 6.25″ X 10″","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Actual Weight","value":"2.02 lbs.","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"},{"label":"Shipping Weight","value":"2.43 lbs.","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"}]},{"name":"Power","fields":[{"label":"Power","value":"16 V Frequency Response: +0, -","source":"https:\/\/www.economik.com\/products\/550b"},{"label":"Power Consumption","value":"±12\/18 Volts\/DC,@ 40 ma.","source":"https:\/\/apiaudio.com\/product\/550b-4-band-eq\/"}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": null,
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Players matching the published factory\/retail specs listed above.",
    "who_should_skip": "Anyone needing fully sweepable, continuously variable parametric control or user-adjustable Q, since the 550b switches between seven fixed frequencies per band and its Q is fixed by the Proportional Q design. Also skip if you have no 500 Series frame and power supply, if you need more than +\/-12 dB of boost\/cut, or if you need stereo from a single unit (this is a one-channel module).",
    "fit_notes": "Verify power, format, and connectivity against your rig before purchase; only sourced fields are listed.",
    "watchouts": "Unsourced claims are omitted. Listing-specific mods, kits, or incomplete units may not match the base model specs.",
    "verification_questions": null
  },
  "retrieval": {
    "summary": null,
    "agent_summary": null,
    "intent_terms": null,
    "use_cases": ["studio-recording","sound-design"],
    "skill_level": "intermediate"
  },
  "trust": {
    "has_verified_retail_listing": false,
    "source_count": 0,
    "source_tier_mix": null,
    "evidence_flags": null,
    "spec_provenance": {"specifications":{"source_url":"https:\/\/www.economik.com\/products\/550b","method":"gear_universe_read_model","fetched":"2026-07-30"}}
  },
  "related": {
    "similar_item_ids": null,
    "comparison_reasons": null
}
}