{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "UNDERTONE AUDIO MPDI-4 — Microphone",
    "brand": "UNDERTONE AUDIO",
    "model": "MPDI-4",
    "mpn": null,
    "gtins": null,
    "handle": "ca-undertone-audio-mpdi-4-0efb8e869f",
    "url": "https://envoy-music.myshopify.com/products/ca-undertone-audio-mpdi-4-0efb8e869f",
    "catalog_product_id": "catalog:d45462442769",
    "lane": "studio",
    "product_object": "microphone preamp"
  },
  "offer": {
    "price": 5645.0,
    "currency": "CAD",
    "available": true,
    "condition": "Brand New",
    "price_band": "high",
    "source_verified_at": "2026-07-10T23:56:52Z"
  },
  "specifications": {"category":"studio","subcategory":"studio","category_path":"studio","groups":[{"id":"format","label":"Format","fields":[{"key":"channels","label":"Channels","value":"4 independent mic preamp\/DI channels","display":"4 independent mic preamp\/DI channels","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"rack_format","label":"Rack format","value":"1RU 19-inch rackmount chassis","display":"1RU 19-inch rackmount chassis","source":"Undertone Audio MPDI-4 product page and Vintage King listing","confidence":0.9},{"key":"circuit_features","label":"Circuit features","value":"Bypassable input and output transformers with switchable output headroom and adjustable THD behavior","display":"Bypassable input and output transformers with switchable output headroom and adjustable THD behavior","source":"Undertone Audio MPDI-4 product page","confidence":0.9}]},{"id":"controls","label":"Controls","fields":[{"key":"gain_range","label":"Gain range","value":"-10 to -60 dB boost range in stepped 5 dB increments","display":"-10 to -60 dB boost range in stepped 5 dB increments","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"input_pad","label":"Input pad","value":"Switchable -20 dB input pad","display":"Switchable -20 dB input pad","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"output_pad","label":"Output pad","value":"Switchable -10 dB output pad","display":"Switchable -10 dB output pad","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"phantom_power","label":"Phantom power","value":"+48 V phantom power","display":"+48 V phantom power","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"phase","label":"Phase","value":"Phase reverse switch","display":"Phase reverse switch","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"output_load","label":"Output load","value":"Switchable 600 ohm output load","display":"Switchable 600 ohm output load","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"low_impedance_mode","label":"Low impedance mode","value":"Switchable low-impedance mode intended for passive ribbon microphones","display":"Switchable low-impedance mode intended for passive ribbon microphones","source":"Undertone Audio MPDI-4 product page","confidence":0.9}]},{"id":"connectivity","label":"Connectivity","fields":[{"key":"front_inputs","label":"Front inputs","value":"Front-panel XLR \/ 1\/4-inch DI combo input per channel","display":"Front-panel XLR \/ 1\/4-inch DI combo input per channel","source":"Undertone Audio MPDI-4 product page","confidence":0.9},{"key":"outputs","label":"Outputs","value":"Mic-pre direct line outputs on XLR","display":"Mic-pre direct line outputs on XLR","source":"Undertone Audio MPDI-4 product page","confidence":0.9}]},{"id":"electrical","label":"Electrical","fields":[{"key":"input_voltage","label":"Input voltage","value":"110-120 \/ 220-240 VAC, 60\/50 Hz reported by retailer listing","display":"110-120 \/ 220-240 VAC, 60\/50 Hz reported by retailer listing","source":"Floating Point Audio MPDI-4 listing\/search result","confidence":0.7},{"key":"di_impedance","label":"Di impedance","value":"4.7 Mohm reported by retailer listing","display":"4.7 Mohm reported by retailer listing","source":"Floating Point Audio MPDI-4 listing\/search result","confidence":0.7},{"key":"output_impedance","label":"Output impedance","value":"Mic output 47 ohm reported by retailer listing","display":"Mic output 47 ohm reported by retailer listing","source":"Floating Point Audio MPDI-4 listing\/search result","confidence":0.7},{"key":"frequency_response","label":"Frequency response","value":"Mic preamp 10 Hz to 80 kHz reported by retailer listing","display":"Mic preamp 10 Hz to 80 kHz reported by retailer listing","source":"Floating Point Audio MPDI-4 listing\/search result","confidence":0.7}]}]},
  "connectivity": ["xlr"],
  "power": null,
  "included_items": null,
  "required_accessories": ["appropriate audio and data cables","compatible monitoring, mounting, or power setup"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Tracking engineers who need four channels of rackmount mic preamp\/DI with per-channel transformer, pad, load and impedance options.",
    "who_should_skip": "Users needing built-in EQ, digital conversion, remote recall\/automation, or more than four channels in a single unit.",
    "fit_notes": "Use the output pad and transformer\/load controls to manage level into converters when driving the preamp harder for harmonic content.",
    "watchouts": "GTIN, full chassis dimensions and verified unit weight were not available on accessible manufacturer or retailer pages.",
    "verification_questions": ["Which connections, drivers, operating systems, and sample rates are supported by this exact revision?","What cables, mounts, power supplies, or licenses are included?","Is the current retailer listing new stock, demo stock, open box, or special order?","Is the item still in stock at the displayed price, and what is the complete delivered cost to the intended destination?"]
  },
  "retrieval": {
    "summary": "MPDI-4 is a recording and studio product represented by 1 current Canadian retailer offer, starting at 5645.00 CAD. Best suited to buyers who can place it within a known recording, monitoring, or signal-routing workflow. EnvoyMusic has verified the source price and availability signal, but has not independently verified every technical specification or US fulfillment detail. This is an verified retail listing reference, not inventory stocked or fulfilled by EnvoyMusic. Retailer price and availability can change; recheck the source before making a purchase decision. Skip it until computer, operating-system, I\/O, cabling, mounting, and room requirements are confirmed.",
    "agent_summary": "UNDERTONE AUDIO MPDI-4. visible colors: black, yellow, red, orange. visible controls: knobs, switches. panel text: MIC GAIN; OUTPUT; ON; 48V; LOW; 48V LOW; PAD; LOAD; 1; 2; 3; 4.",
    "intent_terms": ["studio","home_recording","content_creation","signal_chain","MPDI-4","UNDERTONE AUDIO","Multi-Channels Mic-Preamp","verified retail listing","recording and studio product","home recording","content creation","signal chain"],
    "use_cases": null,
    "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": {"specifications":{"source_url":"https:\/\/www.undertoneaudio.com\/hardware\/mpdi-4","method":"gear_universe_read_model","fetched":"2026-07-21"}}
  },
  "related": {
    "similar_item_ids": [],
    "comparison_reasons": ["source_count:1","lane:studio","verified retail listing_reference"]
}
}