{
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  "projection": "envoy-agent-v1",
  "identity": {
    "title": "Vintage 1980s Shure PE66L *Serviced* Microphone (SM57 Unidyne III) - Shure's Pro Line Made in USA",
    "brand": "Shure",
    "model": null,
    "mpn": null,
    "gtins": null,
    "handle": "gm-shure-unidyne-iii-sm57-cardioid-dynamic-microphone-vintage-1980s-shure-bf32f29f",
    "url": "https://envoy-music.myshopify.com/products/gm-shure-unidyne-iii-sm57-cardioid-dynamic-microphone-vintage-1980s-shure-bf32f29f",
    "catalog_product_id": "product_982aba87bf32f29f",
    "lane": "studio",
    "product_object": "microphones"
  },
  "offer": {
    "price": 438.39,
    "currency": "CAD",
    "available": true,
    "condition": "Excellent",
    "price_band": "mid",
    "source_verified_at": null
  },
  "specifications": {"category":"Pro Audio","subcategory":"Microphones","category_path":"Pro Audio \/ Microphones","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\/sm57","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\/sm57","confidence":0.99},{"key":"frequency_response","label":"Frequency response","value":"40-15000","unit":"Hz","display":"40 Hz – 15 kHz","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm57","confidence":0.98},{"key":"sensitivity","label":"Sensitivity","value":-54.5,"unit":"dBV\/Pa","display":"-54.5 dBV\/Pa (1.9 mV) @ 1 kHz","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm57","confidence":0.97},{"key":"output_impedance","label":"Output impedance","value":310,"unit":"ohm","display":"310 Ω","filterable":false,"source":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm57","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\/sm57","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\/sm57","confidence":0.99}]}]},
  "connectivity": ["xlr"],
  "power": null,
  "included_items": null,
  "required_accessories": ["appropriate cables","monitoring solution","mount or stand if relevant"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": null,
    "who_should_skip": null,
    "fit_notes": "Best suited to players who have outgrown their first setup and need a meaningful step up.\n\nWho it is for: Shoppers who already understand the role of this pro audio and want a more deliberate purchase.\n\nWho should skip it: Skip it if you are still figuring out the basics and need the simplest possible first purchase path.",
    "watchouts": null,
    "verification_questions": ["Can you confirm exactly what is included in the sale and show it in current photos?","Are there any functional issues, repairs, or missing parts not shown in the listing?","Can you provide close-up photos of wear points, serial numbers, and any modifications?","Can you confirm the core specs that matter for compatibility in this setup?","Is this still available and has anything changed since the listing was posted?"]
  },
  "retrieval": {
    "summary": "☆Vintage 1980s Shure PE66L *Serviced* Microphone (SM57 Unidyne III) - Shure's Pro Line Made in USA. Shure. Unidyne III SM57 Cardioid Dynamic Microphone. Pro Audio. Pro Audio \/ Microphones. available from reverb. price range 319.99 USD. condition Excellent. - New Foam Inside - Sounds fantastic - Full Frequency response, nice bass response and treble - Same exact frequency response as the SM57 when comparing manuals back in the 1980s - Has cosmetic wear to paint and grille but it is all purely cosmetic since it does not impact function For sale is a Shure PE66L from the early 1980s, which sounds great and was rebranded under Shure's professional line. The 66 uses the same cartridge as the SM57 and was also made in the USA before Shure moved production over to Mexico in the 90s. The biggest plus with being this microphone over other offerings is the fact this one is refurbished with new foam. The plastic housing and grille also received a cleaning prior to the new foam being installed to ensure debris is kept away and this oldie keeps sounding as it should. The only caveats with this microphone are wear and tear to the finish but this microphone is as solid as can be and there are zero faults that can be seen as serious. If you've considered a vintage 57, this is also a great pickup and valuable workhorse microphone!. ☆Vintage 1980s Shure PE66L *Serviced* Microphone (SM57 Unidyne III) - Shure's Pro Line Made in USA. Shure. Unidyne III SM57 Cardioid Dynamic Microphone. Black. Excellent. Pro Audio. Pro Audio \/ Microphones. - New Foam Inside - Sounds fantastic - Full Frequency response, nice bass response and treble - Same exact frequency response as the SM57 when comparing manuals back in the 1980s - Has cosmetic wear to paint and grille but it is all purely cosmetic since it does not impact function For sale is a Shure PE66L from the early 1980s, which sounds great and was rebranded under Shure's professional line. The 66 uses the same cartridge as the SM57 and was also made in the USA before Shure moved production over to Mexico in the 90s. The biggest plus with being this microphone over other offerings is the fact this one is refurbished with new foam. The plastic housing and grille also received a cleaning prior to the new foam being installed to ensure debris is kept away and this oldie keeps sounding as it should. The only caveats with this microphone are wear and tear to the finish but this microphone is as solid as can be and there are zero faults that can be seen as serious. If you've considered a vintage 57, this is also a great pickup and valuable workhorse microphone!. JR's Audio Gear. San Jose, CA, United States. tags source:reverb family:pro_audio listing_status:live brand:shure model:unidyne_iii_sm57_cardioid_dynamic_microphone category:pro_audio_microphones price_band:entry segment:intermediate condition:excellent has:photos",
    "agent_summary": "Shure Unidyne III SM57 Cardioid Dynamic Microphone is a aimed at intermediate players pro audio listing with marketplace-sourced data. ☆Vintage 1980s Shure PE66L *Serviced* Microphone (SM57 Unidyne III) - Shure's Pro Line Made in USA currently sits around 319.99 USD. - New Foam Inside - Sounds fantastic - Full Frequency response, nice bass response and treble - Same exact frequency response as the SM57 when comparing manuals back in the 1980s - Has cosmetic wear to paint and grille but it is all purely cosmetic since it does not impact function For sale is a Shure PE66L from the early 1980s, which sounds great and was rebranded under Shure's professional line. Marketplace data is richer on listing context, but it needs more buyer verification. Good visual coverage for spot-checking the item. Marketplace listing quality varies by seller, so condition and included items still need verification.",
    "intent_terms": ["☆Vintage 1980s Shure PE66L *Serviced* Microphone (SM57 Unidyne III) - Shure's Pro Line Made in USA","Shure","Unidyne III SM57 Cardioid Dynamic Microphone","Pro Audio","Pro Audio \/ Microphones","brand:shure","category:pro_audio_microphones","condition:excellent","family:pro_audio","has:photos","listing_status:live","model:unidyne_iii_sm57_cardioid_dynamic_microphone","price_band:entry","segment:intermediate","source:reverb","brand shure","category pro audio microphones","condition excellent","family pro audio","has photos","listing status live","model unidyne iii sm57 cardioid dynamic microphone","price band entry","segment intermediate","source reverb","home-recording","content-creation","practice","starter-rig","live-performance","tone-shaping","signal-chain","JR's Audio Gear","Best suited to players who have outgrown their first setup and need a meaningful step up.","Shoppers who already understand the role of this pro audio and want a more deliberate purchase."],
    "use_cases": ["studio-recording","live-performance"],
    "skill_level": "pro"
  },
  "trust": {
    "has_verified_retail_listing": true,
    "source_count": 2,
    "source_tier_mix": ["marketplace"],
    "evidence_flags": {"has_description":true,"has_images":true,"has_reviews":false,"has_specs":false,"source_count":2},
    "spec_provenance": {"specifications":{"source_url":"https:\/\/www.shure.com\/en-US\/products\/microphones\/sm57","method":"manufacturer_datasheet","fetched":"2026-07-19"}}
  },
  "related": {
    "similar_item_ids": ["product_e285a982f7c42948","product_744d59af8a1306b9","product_a2a4a1d3ad722169","product_b0f208d43d907f8e","product_0b47707fa7c2857f","product_04e3e85ed608e242","product_15b779600fcf52f2","product_8a50b0af11cb7262"],
    "comparison_reasons": ["source_count:2","family:Pro Audio","marketplace_only","identity_confidence:0.9"]
,
    "related_products": [{ "title": "Shure SM7B Cardioid Dynamic Microphone w\/XLR", "url": "https://envoy-music.myshopify.com/products/gm-shure-sm7b-cardioid-dynamic-microphone-shure-sm7b-cardioid-dynamic-mic-ad722169", "handle": "gm-shure-sm7b-cardioid-dynamic-microphone-shure-sm7b-cardioid-dynamic-mic-ad722169" },{ "title": "2 Shure SM57 Cardioid Dynamic Microphones 1984 - Present - Black", "url": "https://envoy-music.myshopify.com/products/gm-shure-sm57-cardioid-dynamic-microphones-2-shure-sm57-cardioid-dynamic-3d907f8e", "handle": "gm-shure-sm57-cardioid-dynamic-microphones-2-shure-sm57-cardioid-dynamic-3d907f8e" },{ "title": "Shure SM58 Dynamic vocal microphone", "url": "https://envoy-music.myshopify.com/products/gm-shure-sm58-dynamic-vocal-microphone-shure-sm58-dynamic-vocal-microphon-d608e242", "handle": "gm-shure-sm58-dynamic-vocal-microphone-shure-sm58-dynamic-vocal-microphon-d608e242" },{ "title": "Shure SM81 Small Diaphragm Cardioid Condenser Microphone", "url": "https://envoy-music.myshopify.com/products/gm-shure-sm81-small-diaphragm-cardioid-condenser-microphone-shure-sm81-sm-11cb7262", "handle": "gm-shure-sm81-small-diaphragm-cardioid-condenser-microphone-shure-sm81-sm-11cb7262" }]}
}