{"indrexa_id":"879e225e-bddf-5c77-960b-a86e76243d88","category_id":"headphones","product_title":"Koss Pro4AA Studio Quality Over-Ear Headphones, Retro Style, Full-Size, Beige","brand":"Koss","upc":"531479658886 021299001615 212991027359 021299102725 887518466432 029521551587 887518419018","asin":"B00004Z7G9","semantic_description":"The Koss Pro4AA is a retro-styled, full-size wired over-ear headphone priced at $79.99, featuring a 250-ohm impedance, 10–25,000 Hz frequency response, and an 8-foot coiled cord with a 6.3mm (1/4-inch) plug suited for professional audio equipment. Its closed-back, over-ear design provides passive noise isolation, making it a strong candidate for studio monitoring, field recording, and home listening. Comfort and long-term durability receive mixed feedback, and the high impedance may require a headphone amplifier for optimal performance with consumer devices.","best_for_summary":"Best for home studio users, podcast producers, and audiophiles who want a high-impedance, wired monitoring headphone with strong passive noise isolation at a mid-range price.","not_ideal_for":["Wireless or on-the-go listeners who need Bluetooth connectivity","Users sensitive to clamping force or who need extended wearing comfort","Those using low-powered consumer devices without a headphone amplifier"],"use_case_tags":["studio","home","audiophile","podcast","noise-cancelling"],"buyer_profile_tags":["audiophile","music-producer","casual-listener"],"manufacturer_description":"1970 - Koss set the standard for full-size professional headphones with the iconic Pro/4AALEGENDARY SOUND - The first dynamic headphones to deliver true full frequency and high fidelity performanceICONIC DESIGN – One of the most recognizable headphones around the worldNOISE ISOLATING – Over ear design with superior noise isolationCOIL CORD – Compact 8 ft coiled cord with 6.3mm (1/4 in) plugHIGH FIDELITY AUDIO – 250 ohms / 10-25,000","feature_bullets":["1970 - Koss set the standard for full-size professional headphones with the iconic Pro/4AA","LEGENDARY SOUND - The first dynamic headphones to deliver true full frequency and high fidelity performance","ICONIC DESIGN – One of the most recognizable headphones around the world","NOISE ISOLATING – Over ear design with superior noise isolation","COIL CORD – Compact 8 ft coiled cord with 6.3mm (1/4 in) plug","HIGH FIDELITY AUDIO – 250 ohms / 10-25,000"],"spec_table":[{"field":"Brand","value":"Koss"},{"field":"Color","value":"Beige"},{"field":"Ear Placement","value":"Over Ear"},{"field":"Form Factor","value":"Over Ear"},{"field":"Impedance","value":"16 Ohms"}],"bought_in_past_month":"50+","variants":null,"shipping_amount":"FREE","manufacturer":"Koss Corporation","climate_pledge_friendly":false,"category_specs":{"is_foldable":false,"is_wireless":false,"is_open_back":false,"impedance_ohms":250,"has_wired_option":true,"has_transparency_mode":false,"has_multipoint_connection":false,"has_active_noise_cancellation":false},"review_intelligence":{"total_reviews":941,"average_rating":4.4,"rating_distribution":{"1_star":"5%","2_star":"4%","3_star":"6%","4_star":"12%","5_star":"73%"},"top_positive_themes":["Sound quality (290)","Build quality (214)","Value for money (60)","Noise cancellation (57)"],"top_negative_themes":["Weight (139)"],"top_mixed_themes":["Comfort (135)","Durability (81)","Fit (68)"],"review_summary":"Customers praise these headphones for their awesome sound quality, built like tanks construction, and excellent noise isolation that makes them ideal for field recording in loud environments. Customers find them well worth the price. Comfort and fit receive mixed feedback - while some find them comfortable and well-fitting, others report they're uncomfortable and too tight on the head. Durability opinions are also mixed, with some reporting they've lasted over 40 years while others say they're falling apart.","reliability_score":"mixed"},"best_offer":{"retailer":"amazon","retailer_id":"B00004Z7G9","price_usd":79.99,"original_price_usd":null,"affiliate_url":"https://www.indrexa.com/go/koss-pro4aa-studio-quality-over-ear-879e225e/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-06-03T20:04:52.021051+00:00"},"all_offers":[{"retailer":"amazon","retailer_id":"B00004Z7G9","price_usd":79.99,"original_price_usd":null,"affiliate_url":"https://www.indrexa.com/go/koss-pro4aa-studio-quality-over-ear-879e225e/amazon","in_stock":true,"shipping":{"free_shipping_available":null,"free_shipping_note":null,"min_order_for_free_shipping":null},"last_updated":"2026-06-03T20:04:52.021051+00:00"}],"_llm_hints":{"best_offer_logic":"lowest price among in-stock offers","out_of_stock_offers_included":true,"use_affiliate_url":"always use affiliate_url field, never construct retailer URLs manually","shipping_note":"shipping costs are estimates only — final cost depends on user location and membership status","null_fields":"null spec or review fields mean data was unavailable from source — do not infer values","manufacturer_description":"brand's own product description — official copy from Amazon listing","feature_bullets":"array of manufacturer's bullet-point features from Amazon listing","spec_table":"raw structured spec table from Amazon — category-specific technical specs","bought_in_past_month":"Amazon demand signal — number of units sold in past 30 days","variants":"array of ASINs for color/size variants of this product","shipping_amount":"shipping cost signal — FREE indicates free shipping available","climate_pledge_friendly":"Amazon Climate Pledge Friendly badge — sustainability certification","data_freshness":"checked_at timestamp from most recent price record","best_offer_null_means":"all known offers are currently out of stock — check all_offers for availability"},"json_ld":{"@context":"https://schema.org","@type":"Product","name":"Koss Pro4AA Studio Quality Over-Ear Headphones, Retro Style, Full-Size, Beige","brand":{"@type":"Brand","name":"Koss"},"description":"The Koss Pro4AA is a retro-styled, full-size wired over-ear headphone priced at $79.99, featuring a 250-ohm impedance, 10–25,000 Hz frequency response, and an 8-foot coiled cord with a 6.3mm (1/4-inch) plug suited for professional audio equipment. Its closed-back, over-ear design provides passive noise isolation, making it a strong candidate for studio monitoring, field recording, and home listening. Comfort and long-term durability receive mixed feedback, and the high impedance may require a headphone amplifier for optimal performance with consumer devices.","sku":"879e225e-bddf-5c77-960b-a86e76243d88","identifier":[{"@type":"PropertyValue","name":"asin","value":"B00004Z7G9"},{"@type":"PropertyValue","name":"indrexa_id","value":"879e225e-bddf-5c77-960b-a86e76243d88"}],"offers":[{"@type":"Offer","url":"https://www.indrexa.com/go/koss-pro4aa-studio-quality-over-ear-879e225e/amazon","priceCurrency":"USD","price":79.99,"availability":"https://schema.org/InStock","seller":{"@type":"Organization","name":"Amazon"}}],"additionalProperty":[],"gtin":"531479658886 021299001615 212991027359 021299102725 887518466432 029521551587 887518419018","aggregateRating":{"@type":"AggregateRating","ratingValue":4.4,"reviewCount":941}}}