{"product_id":"heritage-audio-grandchild-670-387335","title":"Grandchild 670","description":"\u003ch3\u003eFrom the Spirit of the HERCHILD to the 500 Series: a \"large format\" signature in a compact module\u003c\/h3\u003e\u003cp\u003eAfter making a strong impression with the HERCHILD Model 670 and Model 660, Heritage Audio brings this tube compression philosophy to a more accessible and easily integrated studio format: the 500 series. The GRANDCHILD 670\/500 retains the core goal of the range, which is to capture that sought-after analog character while making it available in a compact two-module chassis. This precise positioning is what makes it interesting: to rediscover the \"Fairchild\"-type response and an organic compression feel without having to use a bulky rack-format processor.\u003c\/p\u003e\u003ch3\u003eA stereo compressor designed for mixing, bussing, and demanding tracking\u003c\/h3\u003e\u003cp\u003eThe GRANDCHILD 670\/500 is aimed at sound engineers, producers, and advanced home studio users who want musical stereo compression capable of adding \u003cstrong\u003edensity\u003c\/strong\u003e, \u003cstrong\u003eglue\u003c\/strong\u003e, and \u003cstrong\u003etexture\u003c\/strong\u003e to a drum bus, instrument bus, stereo synth, guitars, or even a mix bus when seeking a warm imprint. Its Variable Mu design emphasizes a natural and progressive action, ideal for controlling dynamics without crushing the sense of movement, while adding the harmonic richness typical of tube stages.\u003c\/p\u003e\u003ch3\u003eControls, curve, and sidechain: compression ranging from firm limiting to transparency\u003c\/h3\u003e\u003ch4\u003eTrue Variable Mu, NOS tubes, and dedicated transformers\u003c\/h4\u003e\u003cp\u003eAt the heart of the module is an authentic Variable Mu compression topology: \u003cstrong\u003etwo NOS 6BA6 (5749) tubes per channel\u003c\/strong\u003e, paired with \u003cstrong\u003ethree transformers\u003c\/strong\u003e (one per channel and one for the sidechain circuit). This construction aims to reproduce the elusive response and behavior sought after: compression that can be broad and authoritative, yet surprisingly smooth when set for subtlety.\u003c\/p\u003e\u003ch4\u003eSettings inspired by classics, adapted to modern workflows\u003c\/h4\u003e\u003cp\u003eThe \u003cstrong\u003eINPUT GAIN\u003c\/strong\u003e control offers an adjustable range of \u003cstrong\u003e20 dB\u003c\/strong\u003e, useful for calibrating input level and pushing the compression stage according to the desired color. The \u003cstrong\u003eAC Threshold\u003c\/strong\u003e sets the working threshold, while the selection of \u003cstrong\u003e5 attack and release times\u003c\/strong\u003e facilitates adaptation to the source: from fast hold to tame transients to slower times that preserve punch while thickening the signal.\u003c\/p\u003e\u003ch4\u003eDC Threshold: continuous progressive slope\u003c\/h4\u003e\u003cp\u003eThe \u003cstrong\u003eDC Threshold\u003c\/strong\u003e provides access to progressive ratio behavior, a particularly musical approach when you want to avoid the \"brick wall\" feel typical of some harsher compressors. Here, the adjustment acts like a curve combining ratio and knee concepts: you can go from firmer limiting to very soft and transparent compression, with a smooth transition that remains pleasant on complex signals.\u003c\/p\u003e\u003ch4\u003e3-position sidechain high-pass filter: stable lows, a breathing mix\u003c\/h4\u003e\u003cp\u003eEssential for modern productions, the \u003cstrong\u003e3-position sidechain high-pass filter\u003c\/strong\u003e reduces the influence of low frequencies on the detection circuit. The result: the compressor reacts less to kick drum hits or overly dominant bass notes, helping to preserve the low-end foundation while achieving more consistent and \"mix-ready\" gain reduction.\u003c\/p\u003e\u003ch4\u003eVU meter, bypass, and 500 series ergonomics\u003c\/h4\u003e\u003cp\u003eThe \u003cstrong\u003eVU meter\u003c\/strong\u003e allows quick visualization of the processing behavior, useful both during tracking and mixing. The \u003cstrong\u003ebypass switch\u003c\/strong\u003e facilitates instant A\/B comparisons, essential for dialing in the right compression level and validating the musical impact of the processing within the context of the track.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003cstyle\u003e@media(max-width:632px){table[data-wb-spec]{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}table[data-wb-spec] colgroup{display:none}table[data-wb-spec] tbody,table[data-wb-spec] tr{display:contents}table[data-wb-spec] td{display:block;overflow-wrap:anywhere;grid-row:var(--wb-l);background-color:var(--wb-lb)}table[data-wb-spec] td[data-r]{grid-row:var(--wb-r);background-color:var(--wb-rb)}table[data-wb-spec] td[colspan=\"2\"]{grid-column:1\/-1}table[data-wb-spec] td:empty{display:none}}\u003c\/style\u003e\n\u003ctable data-wb-spec style=\"width:100%;table-layout:fixed\"\u003e\n\u003ccolgroup\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol 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Title","offer_id":54333923754259,"sku":"387335","price":1999.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0872\/6803\/files\/af5d189415b6fbe2c498341cb1bceedc7a9d7b86_RHA_GRANDCHILD670_500.png?v=1789574354","url":"https:\/\/woodbrass.shop\/products\/heritage-audio-500-series-tube-vari-mu-compressor-387335","provider":"Woodbrass.com","version":"1.0","type":"link"}