{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "API 312 — Microphone Preamp",
    "brand": "API",
    "model": "312",
    "mpn": null,
    "gtins": null,
    "handle": "ca-api-312-bb3da4dae9",
    "url": "https://envoy-music.myshopify.com/products/ca-api-312-bb3da4dae9",
    "catalog_product_id": "catalog:a9bfebb65911",
    "lane": "studio",
    "product_object": "microphone preamp"
  },
  "offer": {
    "price": 985.0,
    "currency": "CAD",
    "available": true,
    "condition": "Brand New",
    "price_band": "mid",
    "source_verified_at": "2026-07-10T23:56:52Z"
  },
  "specifications": {"device_type":"single-channel 500 Series microphone preamp","channel_count":1,"gain_range":"+34 dB to +69 dB; +14 dB to +49 dB with pad","maximum_input_level":"-4 dBu; +16 dBu with pad","maximum_output_level":"+31 dBu","audio_io":"microphone input and transformer-balanced output through a 15-position .156-inch edge connector","output_impedance":"less than 75 ohms, transformer balanced","frequency_response":"±0.5 dB, 20 Hz to 40 kHz","signal_to_noise_ratio":"120 dB","connectivity":"15-position .156-inch edge connector","power":"±16 V DC at 55 mA from a compatible 500 Series rack","dimensions":"1.5 x 5.25 x 6.75 inches deep","weight":"1.5 lb","controls":"gain, 20 dB pad, 3:1 output-transformer tap, 48 V phantom power, VU meter, peak LED","compatibility":"compatible 500 Series rack providing the documented connector and ±16 V DC power","category":"studio","subcategory":"studio","category_path":"studio"},
  "connectivity": null,
  "power": null,
  "included_items": [],
  "required_accessories": ["compatible 500 Series rack with the documented 15-position edge connector and ±16 V DC power","microphone and downstream audio cabling appropriate to the rack"],
  "optional_accessories": [],
  "compatibility": null,
  "advisor": {
    "best_for": "Recording engineers and studios with a compatible 500 Series rack who want one API 312 microphone-preamp channel with up to 69 dB of gain.",
    "who_should_skip": "Skip it if you need a self-contained rackmount preamp, do not have compatible 500 Series power and I\/O, or require a product explicitly documented for instrument DI.",
    "fit_notes": "Best for adding one channel of the documented API 312 microphone-preamp circuit to an existing compatible 500 Series rack, especially where transformer-balanced output, high headroom, pad, phantom power, and metering are useful.",
    "watchouts": "A compatible 500 Series rack is required and is not part of the documented 312 module. API documents the 312 as a microphone preamp, not a direct box. Confirm rack power, connector compatibility, source condition, and current retailer availability before deciding.",
    "verification_questions": ["Does the intended 500 Series rack provide the documented connector, ±16 V DC power, and sufficient current?","Does the workflow need microphone preamplification only, or a separately documented instrument DI input?","Are the VU meter, peak LED, pad, transformer-tap selector, and phantom-power switch functioning correctly?","Is the Studio Economik offer still new and in stock at the displayed CAD price?"]
  },
  "retrieval": {
    "summary": "API 312 is a single-channel microphone preamp for a compatible 500 Series rack. API documents a +34 to +69 dB gain range, or +14 to +49 dB with the 20 dB pad, a fully discrete 2520-op-amp circuit, proprietary AP2516 input transformer, transformer-balanced output below 75 ohms, switchable 48 V phantom power, 3:1 output-transformer tap selection, analog VU meter, and peak LED. It is suited to engineers choosing a transformer-based API microphone front end one channel at a time. It is not a self-contained preamp: the manufacturer specifies a 15-position edge connector and ±16 V DC rack power. Choose a product explicitly documented for instrument DI if that is required; API documents this model as a microphone preamp. This is an external verified retail listing reference, not Envoy Music inventory or fulfillment.",
    "agent_summary": "API 312 is a single-channel 500 Series microphone preamp with up to 69 dB of gain, a discrete API 2520 op amp, AP2516 input transformer, transformer-balanced output, 20 dB pad, selectable 3:1 output-transformer tap, 48 V phantom power, VU meter, and peak LED.",
    "intent_terms": ["single channel 500 Series microphone preamp","API console style microphone preamp","transformer microphone preamp","high gain microphone preamp"],
    "use_cases": ["single-channel microphone recording","500 Series studio front end","high-headroom microphone amplification"],
    "skill_level": "pro"
  },
  "trust": {
    "has_verified_retail_listing": true,
    "source_count": 1,
    "source_tier_mix": ["retailer"],
    "evidence_flags": {"external_inventory":true,"source_availability":true,"source_price":true,"source_url":true,"structured_specs":false},
    "spec_provenance": null
  },
  "related": {
    "similar_item_ids": [],
    "comparison_reasons": ["source_count:1","lane:studio","verified retail listing_reference"]
}
}