{"sources":[{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","type":"listing","url":"https://prod-jbhifi.myshopify.com/products.json","retrieval_at":"2026-10-05T19:02:44.519Z","source_hash":"ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","access_verdict":"permitted","robots_result":"allow"}],"summaries":[],"facts":[{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:0","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Operating principle","ordinal":0,"value_number":null,"unit":null,"value_text":"The headphones are closed-back.","original_value":"Operating principle Closed","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":400,"end":426,"summary_id":null,"excerpt_id":null,"span_sha256":"e0f0c87b22d592d4fca11bc5ee310bf734fc6eefc4a5d1c9cc73d3277b79d033","source_locator":"characters 400 to 426 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:1","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Frequency response","ordinal":1,"value_number":null,"unit":null,"value_text":"Nominal frequency response is 5-35,000 Hz.","original_value":"Nominal frequency response 5-35,000Hz","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":427,"end":464,"summary_id":null,"excerpt_id":null,"span_sha256":"a6377d62887ea601e235496e2d4e8967fd692c58a9fd243372552509e22ac6d4","source_locator":"characters 427 to 464 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:2","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Impedance","ordinal":2,"value_number":null,"unit":null,"value_text":"Nominal impedance is 80 ohm.","original_value":"Nominal impedance 80 ohm","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":465,"end":489,"summary_id":null,"excerpt_id":null,"span_sha256":"51844aaed65da37a283c43b42cbb58a3af52440633ebb969fdf2aa3aab2a6846","source_locator":"characters 465 to 489 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:3","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Sound pressure level","ordinal":3,"value_number":null,"unit":null,"value_text":"Nominal SPL is 96 dB.","original_value":"Nominal SPL 96dB SPL","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":490,"end":510,"summary_id":null,"excerpt_id":null,"span_sha256":"946da6fd79b22b2fa36a76d7317a01bfee086b0aed4e44108d1517d7a4859317","source_locator":"characters 490 to 510 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:4","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Total harmonic distortion","ordinal":4,"value_number":null,"unit":null,"value_text":"Nominal T.H.D. is less than 0.2%.","original_value":"Nominal T.H.D. <0.2%","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":511,"end":531,"summary_id":null,"excerpt_id":null,"span_sha256":"811837ec6ff51c8c6dce93cfb3c7a34095e9b8c99dcf712a11ea0cc9bc22ded0","source_locator":"characters 511 to 531 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:5","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Power handling","ordinal":5,"value_number":null,"unit":null,"value_text":"Power handling capacity is 100 mW.","original_value":"Power handling capacity 100mW","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":532,"end":561,"summary_id":null,"excerpt_id":null,"span_sha256":"b2cf2ca0ac18bb70a1b02e395cd461f156823aeda5131ff7a51d7cd0cae9e932","source_locator":"characters 532 to 561 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:6","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Sound coupling","ordinal":6,"value_number":null,"unit":null,"value_text":"Sound coupling to ear is circumaural.","original_value":"Sound coupling to ear Circumaural","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":562,"end":595,"summary_id":null,"excerpt_id":null,"span_sha256":"d8d7bfe1214c6f0c5292f5dace684fa7542dbcd712c617be32991211aa58a4f9","source_locator":"characters 562 to 595 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:7","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Ambient noise isolation","ordinal":7,"value_number":null,"unit":null,"value_text":"Ambient noise isolation for the 80 ohm version is approximately 18 dBA.","original_value":"Ambient noise isolation 80 ohm version. approx. 18 dBA","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":596,"end":650,"summary_id":null,"excerpt_id":null,"span_sha256":"6668e9731da386147b1fe1712f52c7560289a0996bce1e5ded7b740bb1fb3370","source_locator":"characters 596 to 650 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:8","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Headband pressure","ordinal":8,"value_number":null,"unit":null,"value_text":"Nominal headband pressure is approximately 3.5 N.","original_value":"Nominal headband pressure Approx. 3.5 N","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":651,"end":690,"summary_id":null,"excerpt_id":null,"span_sha256":"c768c5eb579bf8811ae2fd964d101f0300a838bd854ab68d7f801771a94899c8","source_locator":"characters 651 to 690 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:9","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Weight","ordinal":9,"value_number":null,"unit":null,"value_text":"Weight without cable is 270 g.","original_value":"Weight (without cable) 270g","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":691,"end":718,"summary_id":null,"excerpt_id":null,"span_sha256":"92f97b53be05f0c0ac93ec07fc8609eb4d11e61cfd601281212dd8bcc3dde87c","source_locator":"characters 691 to 718 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:10","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Cable","ordinal":10,"value_number":null,"unit":null,"value_text":"Cable is 3 m straight.","original_value":"Length and type of cable 80 ohm version 3 m / straight cable","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":719,"end":779,"summary_id":null,"excerpt_id":null,"span_sha256":"c4d68e6ba91ebc31ac346ed33e4b7c42df0365bb8534a55a06b787f2473e7983","source_locator":"characters 719 to 779 of the retained text"}},{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:fact:11","source_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing","field":"Connection","ordinal":11,"value_number":null,"unit":null,"value_text":"Connection is a gold plated stereo jack plug (3.5 mm) and 1/4\" adapter (6.35 mm).","original_value":"Connection Gold plated stereo jack plug (3.5 mm) and 1/4\" adapter (6.35 mm)","confidence":1,"citation":{"lineage_tier":"T1","artefact_id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:quick:source:0:listing:artefact:ae80825c2ac38dcf3a0b845c4ae9b9717f1dce938a77a2aa7834159fb1948827","start":780,"end":855,"summary_id":null,"excerpt_id":null,"span_sha256":"9dd6b30d754264ce210020ff87e4c2e02660f01f3ea8436f7a8b1a2bc096c3ee","source_locator":"characters 780 to 855 of the retained text"}}],"facet_texts":[],"gaps":[{"id":"jbhifi-com-au--beyerdynamic-dt770-pro-closed-reference-studio-headphones-80-ohm:pack:1:gap:facets:0","source_type":"facets","url":null,"reason":"embeddings skipped in the store-data batch","detail":"the store-data batch makes no embedding call of any kind; this pack has no facet texts and no vectors","recorded_at":"2026-10-06T02:58:13.495Z"}],"facet_check":null,"evidence_depth":{"note":"Store data: every fact here was written from the product data the store itself publishes (title, vendor, product type, variants, tags and description), as RoboTrunk holds it, and each fact's quote was found word for word in that text. No outside source was read and no web search was made. The grader then checked each fact against that text. A deeper read with outside sources may follow later.","depth":"store_data","model":"deepseek-flash","sources":[{"url":"https://prod-jbhifi.myshopify.com/products.json","role":"the store's own product data","retained":true}],"batch_id":"store-data:jbhifi-com-au:2026-10-06T02-56-19-756Z:481","reasoning":"none","batch_size":10,"embeddings":"skipped in the store-data batch: no embedding call of any kind is made in this mode","merged_stores":[],"description_cut":false,"write_turn_timeout_minutes":10,"facts_dropped_quote_not_found":0}}