{"product_id":"wmd-qaaf-quad-anti-aliasing-filter-4hp-1","title":"WMD QAAF Quad Anti-Aliasing Filter - 4HP","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eWMD QAAF Quad Anti-Aliasing Filter 4HP\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eWMD QAAF is a compact four-channel analog filtering module designed to remove aliasing, stepped digital artifacts and unwanted high-frequency content from Eurorack signals. Originally developed as an expansion for the WMD Phase Displacement Oscillator, QAAF can also operate completely independently as a versatile pre- or post-processing filter bank.\u003c\/p\u003e\n\u003cp\u003eEach of the four channels uses a 4-pole switched-capacitor Butterworth low-pass filter with closely matched cutoff frequencies across all channels. The module provides individual audio inputs and outputs for all four filters along with a Mix output that sums the four filtered signals.\u003c\/p\u003e\n\u003cp\u003eA shared CV input controls the filter frequencies and is approximately calibrated to 1V\/octave. The Frequency control provides manual cutoff adjustment and also acts as an offset for incoming CV. The CLK connection can operate as either a clock input or output and directly controls filter frequency at a 100:1 relationship, with the operating mode selected using a rear-panel jumper.\u003c\/p\u003e\n\u003cp\u003eA second rear jumper can limit the minimum cutoff frequency to approximately 300Hz, preventing the QAAF's switched-capacitor clock from entering the audible range. Its fully analog architecture, compact 4HP footprint and four independent channels make QAAF useful not only for anti-aliasing but also for smoothing digital waveforms, filtering modulation-derived audio and general multi-channel low-pass processing. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFour independent analog low-pass filters\u003c\/li\u003e\n\u003cli\u003eDesigned for anti-aliasing and waveform smoothing\u003c\/li\u003e\n\u003cli\u003eOriginally designed as a WMD PDO expansion\u003c\/li\u003e\n\u003cli\u003eCan operate independently as a standalone filter module\u003c\/li\u003e\n\u003cli\u003e4-pole filter architecture\u003c\/li\u003e\n\u003cli\u003e24dB\/octave response\u003c\/li\u003e\n\u003cli\u003eButterworth response curve\u003c\/li\u003e\n\u003cli\u003eSwitched-capacitor filter design\u003c\/li\u003e\n\u003cli\u003eApproximately ±0.5% channel-to-channel frequency matching\u003c\/li\u003e\n\u003cli\u003eFour individual audio inputs\u003c\/li\u003e\n\u003cli\u003eFour individual audio outputs\u003c\/li\u003e\n\u003cli\u003eMix output sums all four filtered channels\u003c\/li\u003e\n\u003cli\u003eShared CV frequency control\u003c\/li\u003e\n\u003cli\u003eCV input approximately calibrated to 1V\/octave\u003c\/li\u003e\n\u003cli\u003eFrequency offset control\u003c\/li\u003e\n\u003cli\u003eConfigurable clock input or output\u003c\/li\u003e\n\u003cli\u003e100:1 clock-to-filter frequency relationship\u003c\/li\u003e\n\u003cli\u003eRear low-frequency limit jumper\u003c\/li\u003e\n\u003cli\u003eApproximately 300Hz minimum cutoff when limiter is enabled\u003c\/li\u003e\n\u003cli\u003ePDO expansion header\u003c\/li\u003e\n\u003cli\u003eSuitable for pre- and post-filtering applications\u003c\/li\u003e\n\u003cli\u003eFully analog signal path\u003c\/li\u003e\n\u003cli\u003e4HP Eurorack format\u003c\/li\u003e\n\u003cli\u003e40mm module depth\u003c\/li\u003e\n\u003cli\u003e+12V power consumption: 35mA\u003c\/li\u003e\n\u003cli\u003e-12V power consumption: 35mA\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"WMD Devices","offers":[{"title":"Default Title","offer_id":46813814325437,"sku":"1057794","price":325.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0526\/4175\/9421\/files\/QAAF_1024x1024__1.jpg?v=1787055746","url":"https:\/\/moogaudio.com\/fr\/products\/wmd-qaaf-quad-anti-aliasing-filter-4hp-1","provider":"Moog Audio","version":"1.0","type":"link"}