{
  "schema_version": 1,
  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Shure SM58 Unidirectional\/Cardioid Dynamic Microphone",
    "brand": "Shure",
    "model": "SM58",
    "mpn": "20835",
    "gtins": null,
    "handle": "gm-shure-sm58-lc-shure-sm58-unidirectional-cardioid-dynamic-microphone-853660e9",
    "url": "https://envoy-music.myshopify.com/products/gm-shure-sm58-lc-shure-sm58-unidirectional-cardioid-dynamic-microphone-853660e9",
    "catalog_product_id": "catalog:0961ccfebe95",
    "lane": "studio",
    "product_object": "dynamic microphone"
  },
  "offer": {
    "price": 149.0,
    "currency": "CAD",
    "available": true,
    "condition": "Brand New",
    "price_band": "mid",
    "source_verified_at": null
  },
  "specifications": {"category":"Pro Audio Recording","subcategory":"Pro Audio Recording","category_path":"Pro Audio Recording","groups":[{"id":"core","label":"Microphone","fields":[{"key":"mic_type","label":"Type","value":"dynamic","unit":"","display":"Dynamic (moving coil)","filterable":true,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.99},{"key":"polar_pattern","label":"Polar pattern","value":"cardioid","unit":"","display":"Cardioid","filterable":true,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.99},{"key":"frequency_response","label":"Frequency response","value":"50-15000","unit":"Hz","display":"50 Hz – 15 kHz","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.98},{"key":"sensitivity","label":"Sensitivity","value":-56.0,"unit":"dBV\/Pa","display":"-56 dBV\/Pa (1.6 mV) @ 1 kHz","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.97},{"key":"output_impedance","label":"Output impedance","value":300,"unit":"ohm","display":"300 Ω","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.98},{"key":"connector","label":"Connector","value":"XLR","unit":"","display":"XLR (3-pin)","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.98},{"key":"phantom_required","label":"Phantom power required","value":false,"unit":"","display":"No","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","confidence":0.99}]}]},
  "connectivity": ["xlr"],
  "power": null,
  "included_items": ["SM58-LC microphone","A25D swivel stand adapter","storage bag"],
  "required_accessories": ["XLR microphone cable","microphone stand when hands-free use is required","audio interface, mixer, or microphone preamp"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": "Live singers, rehearsal rooms, public speakers, venues, and home recordists who need a durable handheld dynamic vocal microphone.",
    "who_should_skip": "Skip it if you need the extended detail of a studio condenser, a tighter supercardioid pickup pattern, an on\/off switch, or a bundle that already includes an XLR cable.",
    "fit_notes": "Best for live vocals and speech where durability, handling-noise control, and predictable cardioid rejection matter more than condenser-level detail. It also works for basic home recording when the source can stay close to the microphone.",
    "watchouts": "The SM58-LC package does not include an XLR cable. Confirm the exact variant, stand and cable requirements, grille and connector condition, and seller authenticity.",
    "verification_questions": ["Is this the SM58-LC variant, and does the offer exclude an XLR cable?","Are the grille, capsule, XLR connector, and stand adapter undamaged and fully functional?","Can the seller substantiate authenticity and provenance?","Is the retailer offer still available at the displayed CAD price?"]
  },
  "retrieval": {
    "summary": "Shure SM58-LC is a handheld cardioid dynamic microphone designed primarily for vocals and speech. Manufacturer specifications support a 50 Hz-15 kHz frequency response, a uniform cardioid pickup pattern, built-in spherical wind and pop filtering, a pneumatic shock-mount system, and rugged construction. The manufacturer package includes an A25D swivel stand adapter and storage bag; the SM58-LC retailer listing explicitly excludes an XLR cable. It suits live vocals, rehearsal, public speaking, and creators who need a robust microphone that does not require phantom power. Confirm the exact LC variant, cable and stand needs, connector condition, grille condition, and authenticity when buying used. This is an verified retail listing reference, not EnvoyMusic inventory; verify the current Canadian retailer price and availability.",
    "agent_summary": "Shure SM58-LC is a cardioid dynamic vocal microphone for live vocals, speech, rehearsal, and recording. Its 50 Hz-15 kHz vocal response, built-in spherical wind and pop filter, internal pneumatic shock mount, rugged grille, and forgiving cardioid pattern make it a durable general-purpose handheld mic. The LC package does not include an XLR cable.",
    "intent_terms": ["live vocal microphone","durable handheld mic","dynamic speech microphone","rehearsal microphone","stage vocal mic"],
    "use_cases": ["live vocals","speech and presentations","rehearsal","basic home recording"],
    "skill_level": "beginner"
  },
  "trust": {
    "has_verified_retail_listing": true,
    "source_count": 1,
    "source_tier_mix": ["retailer"],
    "evidence_flags": {"has_description":true,"has_images":true,"has_reviews":true,"has_specs":false,"source_count":1},
    "spec_provenance": {"specifications":{"source_url":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm58","method":"manufacturer_datasheet","fetched":"2026-07-19"}}
  },
  "related": {
    "similar_item_ids": ["product_97fa1256c35ae03d","product_5b18d8e4c54ee8fa","product_9624b865262320a2","product_f4f9f514e7afcaff","product_c80dbdca29d83a0d","product_1574261d0313e788","product_f1420a36055d447c","product_3c84c73ed1caebc0"],
    "comparison_reasons": ["source_count:1","family:Pro Audio Recording","supplier_available","identity_confidence:0.98"]
}
}