{
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  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Sennheiser MD 421 II Cardioid Dynamic Microphone",
    "brand": "Sennheiser",
    "model": null,
    "mpn": "000984",
    "gtins": null,
    "handle": "gm-sennheiser-md-421-ii-cardioid-dynamic-microphone-sennheiser-md-421-ii-f50c0ff9",
    "url": "https://envoy-music.myshopify.com/products/gm-sennheiser-md-421-ii-cardioid-dynamic-microphone-sennheiser-md-421-ii-f50c0ff9",
    "catalog_product_id": "reverb_listing:95557083",
    "lane": "studio",
    "product_object": "cardioid dynamic microphone"
  },
  "offer": {
    "price": 393.19,
    "currency": "CAD",
    "available": true,
    "condition": "Excellent",
    "price_band": "mid",
    "source_verified_at": null
  },
  "specifications": {"category":"Microphone","groups":[{"id":"general","label":"General","fields":[{"key":"transducer_principle","label":"Transducer Principle","value":"Dynamic","display":"Dynamic","source":"https:\/\/recordinghacks.com\/microphones\/Sennheiser\/MD-421","confidence":0.99},{"key":"polar_pattern","label":"Polar Pattern","value":"Cardioid","display":"Cardioid","source":"https:\/\/www.sennheiser.com\/en-us\/catalog\/products\/microphones\/md-421-ii\/md-421-ii-000984","confidence":0.99},{"key":"connector","label":"Connector","value":"3-pin XLR","display":"3-pin XLR (male)","source":"https:\/\/recordinghacks.com\/microphones\/Sennheiser\/MD-421","confidence":0.95}]},{"id":"audio-performance","label":"Audio Performance","fields":[{"key":"frequency_response","label":"Frequency Response","value":"30 - 17000","unit":"Hz","display":"30 - 17,000 Hz","source":"https:\/\/www.manualslib.com\/manual\/345646\/Sennheiser-Md-421-Ii.html","confidence":0.99},{"key":"sensitivity","label":"Sensitivity (free field, no load, 1 kHz)","value":"2","unit":"mV\/Pa","display":"2 mV\/Pa ± 3 dB","source":"https:\/\/www.manualslib.com\/manual\/345646\/Sennheiser-Md-421-Ii.html","confidence":0.98},{"key":"nominal_impedance","label":"Nominal Impedance","value":"250","unit":"Ω","display":"250 Ω","source":"https:\/\/www.sennheiser.com\/en-us\/catalog\/products\/microphones\/md-421-ii\/md-421-ii-000984","confidence":0.75},{"key":"min_terminating_impedance","label":"Minimum Terminating Impedance","value":"1000","unit":"Ω","display":"1000 Ω","source":"https:\/\/www.sennheiser.com\/en-us\/catalog\/products\/microphones\/md-421-ii\/md-421-ii-000984","confidence":0.7}]},{"id":"features","label":"Features","fields":[{"key":"bass_rolloff_switch","label":"Bass Roll-off Switch","value":"5-position (M to S)","display":"Five-position bass roll-off switch, from M (Music, flat) to S (Speech)","source":"https:\/\/recordinghacks.com\/microphones\/Sennheiser\/MD-421","confidence":0.95},{"key":"speech_position_cut","label":"Speech (S) Position Roll-off","value":"approx. 6 dB below 500 Hz","display":"S (Speech) position cuts approx. 6 dB below 500 Hz","source":"https:\/\/recordinghacks.com\/microphones\/Sennheiser\/MD-421","confidence":0.9}]},{"id":"physical","label":"Physical","fields":[{"key":"dimensions","label":"Dimensions","value":"215 x 46 x 49","unit":"mm","display":"215 x 46 x 49 mm","source":"https:\/\/www.manualslib.com\/manual\/345646\/Sennheiser-Md-421-Ii.html","confidence":0.95},{"key":"weight","label":"Weight","value":"354","unit":"g","display":"354 g","source":"https:\/\/www.sennheiser.com\/en-us\/catalog\/products\/microphones\/md-421-ii\/md-421-ii-000984","confidence":0.7}]},{"id":"identifiers","label":"Identifiers","fields":[{"key":"article_number","label":"Article Number (MPN)","value":"000984","display":"000984","source":"https:\/\/www.sennheiser.com\/en-us\/catalog\/products\/microphones\/md-421-ii\/md-421-ii-000984","confidence":0.95}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": null,
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Recording and reinforcing loud, transient sources: drum toms and snare, electric guitar and bass cabinets, brass, and broadcast\/podcast voice. Its cardioid pattern and marketed feedback rejection suit close-miking on stage and in the studio, and the five-position bass roll-off lets you tame proximity buildup when working close.",
    "who_should_skip": "Anyone needing extended top-end 'air' above 17 kHz (its response tops out at 17,000 Hz), such as cymbal overheads or detailed acoustic-instrument capture, and anyone without a decent mic preamp — as a dynamic mic with 2 mV\/Pa output it needs clean preamp gain and does not use phantom power.",
    "fit_notes": "Cardioid dynamic with a 3-pin XLR output; requires a standard mic preamp (no phantom power). The five-position bass roll-off switch runs from M (Music, flat) to S (Speech), where the S setting reduces low end by roughly 6 dB below 500 Hz — useful for controlling proximity effect on close-miked voice or instruments. Frequency response is 30 - 17,000 Hz with 2 mV\/Pa sensitivity.",
    "watchouts": "Manufacturer and datasheet figures disagree on two specs — impedance (250 Ω nominal \/ 1000 Ω minimum terminating versus 200 Ω \/ 200 Ω) and weight (354 g versus about 385 g); confirm against your exact unit if impedance matching or weight is critical. As a dynamic mic it needs a preamp with adequate clean gain and won't run on phantom power, and its response tops out at 17 kHz with little air above that.",
    "verification_questions": null
  },
  "retrieval": {
    "summary": null,
    "agent_summary": null,
    "intent_terms": null,
    "use_cases": ["studio-recording","live-performance"],
    "skill_level": "intermediate"
  },
  "trust": {
    "has_verified_retail_listing": false,
    "source_count": 0,
    "source_tier_mix": null,
    "evidence_flags": null,
    "spec_provenance": null
  },
  "related": {
    "similar_item_ids": null,
    "comparison_reasons": null
}
}