{"product_id":"heritage-audio-herchild-next-gen-670n-stereo-tube-compressor","title":"Heritage Audio Herchild Next Gen 670N Stereo Tube Variable-Mu Compressor Limiter","description":"\u003ch2\u003eHeritage Audio Herchild Next Gen 670N Stereo Tube Variable-Mu Compressor Limiter\u003c\/h2\u003e\n\n\u003c!-- Video Section with Keyword Title --\u003e\n\u003cdiv style=\"margin:20px auto 10px auto; text-align:center; max-width:800px;\"\u003e\n  \u003ch2 style=\"font-size:20px; margin-bottom:12px;\"\u003eHeritage Audio Herchild Next Gen 670N Overview\u003c\/h2\u003e\n\n  \u003ciframe src=\"https:\/\/www.youtube.com\/embed\/7pNJsjCHRb4?si=TYaTYxtcVTqErnok\" frameborder=\"0\" allowfullscreen style=\"width:100%; max-width:800px; height:450px; display:block; margin:0 auto; border-radius:8px;\"\u003e\n  \u003c\/iframe\u003e\n\u003c\/div\u003e\n\n\u003c!-- Section 1 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n  \u003cdiv class=\"par-image\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_670N_front_side_view.png?v=1771377745\" alt=\"Heritage Audio Herchild Next Gen 670N stereo tube variable-mu compressor\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"par-text\"\u003e\n    \u003ch2\u003eThe Fairchild 670 Sound, Rethought for Today's Studios\u003c\/h2\u003e\n    \u003cp\u003e\n      Heritage Audio spent four years producing the original Herchild 670 and 660 — exacting Fairchild recreations using 22 tubes and 9 transformers — and another two years distilling everything learned into the Grandchild 670\/500 series module. The Herchild Next Gen 670N is the result of all that accumulated knowledge: a full-size vari-mu stereo compressor driven by four NOS military-grade 6BA6 tubes and six newly designed custom transformers, delivering the unmistakable Fairchild warmth, glue, and program-dependent behavior at less than half the price of the flagship model.\n    \u003c\/p\u003e\n    \u003cp\u003e\n      The 670N doesn't stop at recreation. A thoroughly redesigned output makeup gain stage based on Heritage Audio's own transformer-coupled HA-880 op-amp adds level without touching the underlying tube compression character. Independent bypass switches on each channel enable instant A\/B comparison. Stepped controls for every parameter make sessions fully repeatable. Six updated attack and release time constants have been refined for contemporary production demands rather than faithfully copying the original's curves.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Section 2 --\u003e\n\u003cdiv class=\"par-section reverse\"\u003e\n  \u003cdiv class=\"par-image\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_670N_scaled_right_view.png?v=1771377745\" alt=\"Heritage Audio Herchild 670N five sidechain filter modes DC threshold\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"par-text\"\u003e\n    \u003ch2\u003eFive Sidechain Filter Modes and Refined DC Threshold\u003c\/h2\u003e\n    \u003cp\u003e\n      Where the original Herchild 670 offered four fixed sidechain high-pass frequencies, the 670N expands to five selectable filter modes covering 80 Hz, 160 Hz, 1 kHz, 3 kHz, and 5 kHz. The higher-frequency settings allow the detection circuit to respond to a narrower band of the spectrum — ideal for de-essing or taming cymbal splash on drum overheads while preserving the natural low-end behavior that defines the Fairchild character.\n    \u003c\/p\u003e\n    \u003cp\u003e\n      The progressive DC Threshold has also been recalibrated to offer a more useful working range between fully transparent compression and hard limiting. Combined with program-dependent soft-knee behavior that naturally increases ratio as signals get louder, the 670N gives you precise control over exactly how aggressively the compressor responds — from barely perceptible leveling to full vintage limiting authority.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- Section 3 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n  \u003cdiv class=\"par-image\"\u003e\n    \u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_670N_knob_view.png?v=1771377745\" alt=\"Heritage Audio Herchild 670N LAT VERT mid-side stereo dual mono modes\"\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"par-text\"\u003e\n    \u003ch2\u003eLAT\/VERT Mid-Side Processing and Four Operating Modes\u003c\/h2\u003e\n    \u003cp\u003e\n      The 670N operates in four modes. IND runs each channel independently for dual-mono tracking or parallel applications. LINK connects both channels in true stereo compression. LAT\/VERT engages full mid-side processing — compressing the lateral and vertical components of a stereo signal independently for increased width, depth, and focus in mixing and mastering. LAT\/VERT LINK does the same with both channels driven by an averaged control voltage.\n    \u003c\/p\u003e\n    \u003cp\u003e\n      With an input impedance of 15 kΩ, output impedance of just 50 Ω, and maximum output of +29 dBu, the 670N integrates cleanly into any professional signal chain. Self noise below -78 dBu and harmonic distortion below 0.5% at any level up to +24 dBu ensure the vari-mu character is always musical rather than coloring unexpectedly. Handbuilt in Heritage Audio's factory in Madrid, Spain. As an authorized dealer, Pro Audio Reserve ensures you receive a genuine Heritage Audio product backed by full manufacturer warranty and long-term support.\n    \u003c\/p\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFull-size stereo Fairchild 670-style vari-mu compressor at accessible price\u003c\/li\u003e\n  \u003cli\u003e4 NOS military-grade 6BA6 variable-mu tubes and 6 custom transformers\u003c\/li\u003e\n  \u003cli\u003eClass A tube-based variable-mu compression\u003c\/li\u003e\n  \u003cli\u003eProgram-dependent soft-knee behavior with progressive ratio increase\u003c\/li\u003e\n  \u003cli\u003e6 updated attack and release time constants adapted for modern production\u003c\/li\u003e\n  \u003cli\u003eRefined DC Threshold for improved range between transparent and hard limiting\u003c\/li\u003e\n  \u003cli\u003eHA-880 transformer-coupled op-amp output makeup gain stage per channel\u003c\/li\u003e\n  \u003cli\u003eIndependent bypass switch per channel for instant A\/B comparison\u003c\/li\u003e\n  \u003cli\u003e5 sidechain filter modes: 80 Hz, 160 Hz, 1 kHz, 3 kHz, 5 kHz\u003c\/li\u003e\n  \u003cli\u003eFour operating modes: IND, LINK, LAT\/VERT (mid-side), LAT\/VERT LINK\u003c\/li\u003e\n  \u003cli\u003eStepped controls for every parameter — fully recallable sessions\u003c\/li\u003e\n  \u003cli\u003eInput impedance: 15 kΩ | Output impedance: 50 Ω\u003c\/li\u003e\n  \u003cli\u003eMaximum output: +29 dBu\u003c\/li\u003e\n  \u003cli\u003eSelf noise: less than -78 dBu\u003c\/li\u003e\n  \u003cli\u003eTHD: less than 0.5% at any level up to +24 dBu (no compression)\u003c\/li\u003e\n  \u003cli\u003eFrequency response: 20 Hz – 20 kHz (±0.5 dB)\u003c\/li\u003e\n  \u003cli\u003e6U rackmount, handbuilt in Madrid, Spain\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHeritage Audio Herchild Next Gen 670N Specifications\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #ccc;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth style=\"text-align:left; padding:10px; border:1px solid #ccc; width:35%;\"\u003eSpecification\u003c\/th\u003e\n      \u003cth style=\"text-align:left; padding:10px; border:1px solid #ccc;\"\u003eDetails\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eCompressor Type\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eTube variable-mu compressor\/limiter\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e2 (stereo)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eCircuit Design\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eClass A, tube-based, handwired\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eTubes\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e4 x NOS military-grade 6BA6 variable-mu pentodes\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eTransformers\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e6 custom transformers\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eOutput Makeup Gain Stage\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eHA-880 transformer-coupled op-amp (per channel)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e20 Hz – 20 kHz (±0.5 dB)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eSelf Noise\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eLess than -78 dBu\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eHarmonic Distortion\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eLess than 0.5% at any level up to +24 dBu (no compression)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e15 kΩ\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e50 Ω\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eMaximum Output Level\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e+29 dBu\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eTime Constants\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e6 stepped attack\/release settings (adapted for modern production)\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eSidechain Filter Modes\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eOff, 80 Hz, 160 Hz, 1 kHz, 3 kHz, 5 kHz\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eOperating Modes\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eIND, LINK (stereo), LAT\/VERT (mid-side), LAT\/VERT LINK\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eChannel Bypass\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eIndependent bypass per channel\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Inputs\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e2 x XLR\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Outputs\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e2 x XLR\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eRack Spaces\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e6U\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eStandard IEC AC cable\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003e\u003cstrong\u003eManufactured\u003c\/strong\u003e\u003c\/td\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eMadrid, Spain\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #ccc;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color:#f2f2f2;\"\u003e\n      \u003cth style=\"text-align:left; padding:10px; border:1px solid #ccc;\"\u003eIncluded Items\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eHeritage Audio Herchild Next Gen 670N Stereo Tube Compressor\/Limiter\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr style=\"background-color:#fafafa;\"\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003ePower Cable\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:10px; border:1px solid #ccc;\"\u003eUser Manual\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Heritage Audio","offers":[{"title":"Default Title","offer_id":48015793389723,"sku":null,"price":2999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_670N_front_side_view.png?v=1771377745","url":"https:\/\/proaudioreserve.com\/products\/heritage-audio-herchild-next-gen-670n-stereo-tube-compressor","provider":"Pro Audio Reserve","version":"1.0","type":"link"}