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  "identity": {
    "title": "ADDAC System ADDAC604 Dual Filter (Black)",
    "brand": "ADDAC System",
    "model": null,
    "mpn": null,
    "gtins": null,
    "handle": "gm-addac-system-addac604-dual-filter-black-addac-system-addac604-dual-fil-29e8a3ae",
    "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac604-dual-filter-black-addac-system-addac604-dual-fil-29e8a3ae",
    "catalog_product_id": "product_15323af729e8a3ae",
    "lane": "production",
    "product_object": "eurorack"
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  "offer": {
    "price": 300.03,
    "currency": "CAD",
    "available": true,
    "condition": "Excellent",
    "price_band": "mid",
    "source_verified_at": null
  },
  "specifications": {"type":"json","groups":[{"name":"Filter architecture","fields":[{"label":"Module type","value":"Dedicated multimode filter released from the filter developed for ADDAC105","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"Circuit channels","value":"Duplicated circuitry for use in a stereo signal path","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"Mode switch","value":"Switch sets working mode from Stereo to Dual Mono","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"Stereo cutoff behavior","value":"In Stereo Mode, the Left Cutoff controls the Right Cutoff; Right Cutoff knob and CV input are bypassed by default","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"Normalled inputs","value":"Audio and CV inputs are normalled from Left into Right channels; plugging into Right inputs removes the connection","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"}]},{"name":"Eurorack specifications","fields":[{"label":"Width","value":"6 HP","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"Depth","value":"4 cm","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"+12 V current draw","value":"70 mA","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"-12 V current draw","value":"70 mA","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"},{"label":"DIY kit availability","value":"Available as a full DIY kit","source":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604"}]}]},
  "connectivity": null,
  "power": null,
  "included_items": null,
  "required_accessories": ["keyboard stand","sustain pedal","headphones or amp"],
  "optional_accessories": null,
  "compatibility": null,
  "advisor": {
    "best_for": null,
    "who_should_skip": null,
    "fit_notes": null,
    "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": "ADDAC System ADDAC604 Dual Filter (Black) [USED]. ADDAC System. ADDAC604 Dual Filter (Black). Keyboards and Synths. Keyboards and Synths \/ Synths \/ Eurorack. available from reverb. price range 219 USD. condition Excellent. - Buy with confidence: guaranteed to be 100% functional - Peace of mind: the photos above are the actual unit you will receive - Pay over time: financing available - Free, fast shipping on most orders Any notable cosmetic issues will be noted below in red. The photos shown above are of the actual unit you will receive. All included accessories \u0026 peripheral items are pictured above and\/or documented below in bulleted text. Contact us for general information about used item condition and policies.. ADDAC System ADDAC604 Dual Filter (Black) [USED]. ADDAC System. ADDAC604 Dual Filter (Black). Black. Excellent. Keyboards and Synths. Keyboards and Synths \/ Synths \/ Eurorack. - Buy with confidence: guaranteed to be 100% functional - Peace of mind: the photos above are the actual unit you will receive - Pay over time: financing available - Free, fast shipping on most orders Any notable cosmetic issues will be noted below in red. The photos shown above are of the actual unit you will receive. All included accessories \u0026 peripheral items are pictured above and\/or documented below in bulleted text. Contact us for general information about used item condition and policies.. Perfect Circuit. Burbank, CA, United States. tags source:reverb family:keyboards_and_synths listing_status:live brand:addac_system model:addac604_dual_filter_black category:keyboards_and_synths_synths_eurorack price_band:entry segment:beginner condition:excellent has:photos",
    "agent_summary": "ADDAC System ADDAC604 Dual Filter (Black) is a beginner-friendly keyboards and synths listing with marketplace-sourced data. ADDAC System ADDAC604 Dual Filter (Black) [USED] currently sits around 219 USD. - Buy with confidence: guaranteed to be 100% functional - Peace of mind: the photos above are the actual unit you will receive - Pay over time: financing available - Free, fast shipping on most orders Any notable cosmetic issues will be noted below in red. Marketplace data is richer on listing context, but it needs more buyer verification. Entry-level price positioning makes it accessible for new players. Marketplace listing quality varies by seller, so condition and included items still need verification.",
    "intent_terms": ["ADDAC System ADDAC604 Dual Filter (Black) [USED]","ADDAC System","ADDAC604 Dual Filter (Black)","Keyboards and Synths","Keyboards and Synths \/ Synths \/ Eurorack","brand:addac_system","category:keyboards_and_synths_synths_eurorack","condition:excellent","family:keyboards_and_synths","has:photos","listing_status:live","model:addac604_dual_filter_black","price_band:entry","segment:beginner","source:reverb","brand addac system","category keyboards and synths synths eurorack","condition excellent","family keyboards and synths","has photos","listing status live","model addac604 dual filter black","price band entry","segment beginner","source reverb","practice","starter-rig","live-performance","tone-shaping","Perfect Circuit","Best suited to beginners or budget-constrained shoppers building a first usable rig.","Players building a first keyboards and synths setup with limited budget and a need for obvious","low-friction value."],
    "use_cases": ["modular-synthesis","sound-design"],
    "skill_level": "pro"
  },
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    "source_count": 1,
    "source_tier_mix": ["marketplace"],
    "evidence_flags": {"has_description":true,"has_images":true,"has_reviews":false,"has_specs":false,"source_count":1},
    "spec_provenance": {"specifications":{"source_url":"https:\/\/www.addacsystem.com\/en\/products\/modules\/addac600-series\/addac604","method":"gear_universe_read_model","fetched":"2026-07-30"}}
  },
  "related": {
    "similar_item_ids": ["product_f4091916a8cc620a","product_17e4acdf75947b86","product_175797f46054fd40","product_29e32b6b140ecea5","product_6a95024f68f1cbad"],
    "comparison_reasons": ["source_count:1","family:Keyboards and Synths","marketplace_only","identity_confidence:0.9"]
,
    "related_products": [{ "title": "ADDAC System ADDAC220 Dual Envelope Follower+", "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac220-dual-envelope-follower-addac-system-addac220-dua-a8cc620a", "handle": "gm-addac-system-addac220-dual-envelope-follower-addac-system-addac220-dua-a8cc620a" },{ "title": "ADDAC System ADDAC712 Vintage Pre", "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac712-vintage-pre-addac-system-addac712-vintage-pre-75947b86", "handle": "gm-addac-system-addac712-vintage-pre-addac-system-addac712-vintage-pre-75947b86" },{ "title": "ADDAC System ADDAC320 Servo Control", "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac320-servo-control-addac-system-addac320-servo-contro-6054fd40", "handle": "gm-addac-system-addac320-servo-control-addac-system-addac320-servo-contro-6054fd40" },{ "title": "ADDAC System ADDAC300 REV.02 Power Starvation", "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac300-rev-02-power-starvation-addac-system-addac300-re-140ecea5", "handle": "gm-addac-system-addac300-rev-02-power-starvation-addac-system-addac300-re-140ecea5" },{ "title": "ADDAC System ADDAC508 Swell Physics [DEMO]", "url": "https://envoy-music.myshopify.com/products/gm-addac-system-addac508-swell-physics-addac-system-addac508-swell-physic-68f1cbad", "handle": "gm-addac-system-addac508-swell-physics-addac-system-addac508-swell-physic-68f1cbad" }]}
}