{"id":3131,"date":"2025-12-13T12:25:50","date_gmt":"2025-12-13T12:25:50","guid":{"rendered":"https:\/\/shop.catsynth.de\/?post_type=product&#038;p=3131"},"modified":"2026-01-28T20:48:06","modified_gmt":"2026-01-28T20:48:06","slug":"slimline-dc-blocker","status":"publish","type":"product","link":"https:\/\/shop.catsynth.de\/en\/produkt\/slimline-dc-blocker\/","title":{"rendered":"Slimline DC Blocker"},"content":{"rendered":"<h1><strong data-start=\"1041\" data-end=\"1119\">Slimline DC Blocker<\/strong><\/h1>\n<h3><strong data-start=\"1041\" data-end=\"1119\">4\u00d7 DC offset filter (AC coupler) for Eurorack in 2HP<\/strong><\/h3>\n<p>Reliably remove <strong data-start=\"102\" data-end=\"140\">DC components (DC offset)<\/strong> from <strong data-start=\"145\" data-end=\"182\">audio, sub-audio and CV signals<\/strong> \u2013 and bring order to patch chains that would otherwise be thrown off by invisible offsets. The Slimline DC Blocker preserves the musical core of your signals: it <strong data-start=\"360\" data-end=\"385\">cleanly blocks DC<\/strong>, keeps the <strong data-start=\"396\" data-end=\"437\">passband neutral (unity gain)<\/strong> and ensures downstream modules (mixers, VCAs, filters, compressors, waveshapers) behave <strong data-start=\"528\" data-end=\"557\">stably and repeatably<\/strong>.<\/p>\n<p>Especially with very slow modulations, or when saturation\/distortion generates offsets along the way, the DC Blocker helps you <strong data-start=\"688\" data-end=\"717\">reclaim headroom<\/strong>, <strong data-start=\"719\" data-end=\"757\">reduce click\/pop artefacts<\/strong> and make <strong data-start=\"762\" data-end=\"775\">CV sums<\/strong> precise again. Thanks to its <strong data-start=\"807\" data-end=\"840\">active Butterworth topology<\/strong>, the passband stays flat and unobtrusive, while <strong data-start=\"906\" data-end=\"960\">buffered outputs with low output impedance<\/strong> can drive even long patch chains cleanly \u2013 ideal in the studio as well as on stage.<\/p>\n<h3>Why a DC blocker?<\/h3>\n<ul>\n<li>Fewer clicks & pumping in VCAs\/compressors when offsets enter the chain<\/li>\n<li>More headroom: DC eats into the margin in mixers, VCAs and filters<\/li>\n<li>Clean summed CV & sub-audio signals without drift\/offset errors<\/li>\n<\/ul>\n<h3>2HP compact \u2013 4 channels for clean routing<\/h3>\n<p>Four paths for parallel processing, patch hygiene and clean signal flow across your system \u2013 despite an ultra-compact <strong data-start=\"125\" data-end=\"132\">2HP<\/strong> width. The Slimline DC Blocker gives you <strong data-start=\"174\" data-end=\"201\">four independent channels<\/strong> so you don\u2019t just fix offsets \u201csomewhere\u201d, but exactly where they arise or get in the way: before the mixer, after a waveshaper, in a summed CV bus or right before the recording path. That way you can stabilise multiple points in a patch at once, without constantly repatching or only \u201ctreating\u201d a single problem source.<\/p>\n<p>In dense Eurorack setups this is worth its weight in gold: you use a single space-saving slot and still get enough channels to keep audio, sub-audio and CV clean in parallel \u2013 for structured routings, repeatable results and fewer surprises at the next patch step.<\/p>\n<h3>Two response options: High Fidelity & Fast Settle<\/h3>\n<ul>\n<li>2\u00d7 High Fidelity \u2013 fc \u2248 0.1 Hz: maximum signal integrity even at very low frequencies<\/li>\n<li>2\u00d7 Fast Settle \u2013 fc \u2248 1 Hz: shorter settling time, ideal when offsets need to disappear quickly (e.g. after saturation\/FX)<\/li>\n<\/ul>\n<h3>Active Butterworth high-pass, unity gain<\/h3>\n<p>Unobtrusive in sound means, with the Slimline DC Blocker: DC removal happens <strong data-start=\"80\" data-end=\"108\">precisely and under control<\/strong>, without your signal being \u201cthinned out\u201d, shifted in level, or having its behaviour bent by the load of the next module in the patch. Many typical <strong data-start=\"254\" data-end=\"275\">passive RC filters<\/strong> may look simple on paper, but in practice they depend heavily on the connected inputs and cable capacitance \u2013 the cutoff frequency drifts, the settling behaviour changes, and depending on the patch you can get subtle (or quite noticeable) changes in bass\/sub-audio, transients and the perceived \u201csolidity\u201d of the signal.<\/p>\n<p>By contrast, the Slimline DC Blocker\u2019s <strong data-start=\"643\" data-end=\"668\">active Butterworth topology<\/strong> is designed to stay <strong data-start=\"744\" data-end=\"763\">as flat as possible<\/strong> in the passband (unity gain) and to deliver a <strong data-start=\"796\" data-end=\"843\">defined amplitude and phase response<\/strong>: you get clean AC coupling that sounds like \u201cnothing\u201d \u2013 except that unwanted offsets disappear. Especially with sensitive signals such as slow modulations, sub-audio-adjacent curves, or audio that has already been through saturation, wavefolding or complex sums, this pays off: less unexpected coloration, fewer patch-dependent side effects and overall more stable, repeatable behaviour \u2013 exactly what you expect from an always-on utility.<\/p>\n<h3>Buffered outputs, low output impedance<\/h3>\n<p>Driving downstream stages reliably means: you get <strong data-start=\"65\" data-end=\"105\">a true active output driver<\/strong> instead of \u201cjust\u201d passive RC decoupling. With typical <strong data-start=\"163\" data-end=\"186\">passive RC filters<\/strong>, the effective filter behaviour depends heavily on what comes next \u2013 input impedances, capacitive loads from long patch cables, mults, the next mixer or VCA. This can lead to <strong data-start=\"374\" data-end=\"390\">level loss<\/strong>, \u201csoft\u201d bass\/sub-audio, unexpected <strong data-start=\"430\" data-end=\"448\">time constants<\/strong>, shifted cutoff frequencies and, in the extreme, audible changes when repatching.<\/p>\n<p>Instead, the Slimline DC Blocker works with <strong data-start=\"587\" data-end=\"643\">buffered outputs and low output impedance<\/strong>: the filter stage is isolated from the load, so the behaviour feels <strong data-start=\"717\" data-end=\"745\">consistent and predictable<\/strong> \u2013 even if you use long cables, feed multiple destinations or work in complex patch chains. The result is clean signal flow without unwanted \u201creading along\u201d by the downstream circuit, less crosstalk and less risk that your DC-offset fix \u201cmoves\u201d again at the next patch step. In short: you get DC removal that behaves like a robust utility \u2013 not a fragile compromise that reacts differently from patch to patch.<\/p>\n<h3>Typical applications<\/h3>\n<ul>\n<li>Remove DC offset after wavefolder\/distortion\/saturation<\/li>\n<li>De-drift sub-audio\/LFO before mixing<\/li>\n<li>Keep signal paths \u201cclean\u201d before recording\/audio interface<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<ul>\n<li>Module<\/li>\n<li>16-pin\/16-pin bus cable, 30cm<\/li>\n<li>2\u00d7 M2.5\u00d79 Phillips screw<\/li>\n<li>2\u00d7 M3\u00d79 Phillips screw<\/li>\n<\/ul>\n<p><a href=\"https:\/\/shop.catsynth.de\/wp-content\/uploads\/2025\/12\/Manual-5.pdf\">Slimline DC Blocker manual<\/a><\/p>\n","protected":false},"featured_media":3163,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[155,157],"product_tag":[],"class_list":{"0":"post-3131","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-eurorack-modules","7":"product_cat-slimline","9":"first","10":"instock","11":"purchasable","12":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/product\/3131","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/comments?post=3131"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/media\/3163"}],"wp:attachment":[{"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/media?parent=3131"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/product_brand?post=3131"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/product_cat?post=3131"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/shop.catsynth.de\/en\/wp-json\/wp\/v2\/product_tag?post=3131"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}