{"product_id":"fosi-audio-p4-hifi-preamplifier-3-rca-inputs-eq-bypass-swappable-op-amps-treble-bass-tone-control-for-audiophile-systems","title":"Fosi Audio P4 HiFi Preamplifier: 3 RCA Inputs, EQ\/Bypass, Swappable Op-Amps, Treble \u0026 Bass Tone Control For Audiophile Systems","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eFosi Audio\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertification\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eCE\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eChannels\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e2 (2.0)\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFeatures\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePreamp,Home Audio Preamplifier\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eInput\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e3 RCA Inputs\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaximum Power Per Channel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eNO POWER\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eModel Number\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eP4\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOutput\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eRCA+PRE OUT\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePackage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePower Adapter\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e12V\/1.5A\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000000920131\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\n\u003cdiv\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd27779bb81bf4535bd4d1c596dabd12a0.jpg\" slate-data-type=\"image\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv class=\"detailmodule_media\"\u003e\u003cdiv class=\"video-container-5000222336302\"\u003e\u003cdiv class=\"detail-video\" id=\"5000222336302\" data-previewurl=\"https:\/\/ae01.alicdn.com\/kf\/S298ad232b9524f29aff84e504f990e2eY.jpg\"\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv\u003e\u003cdiv\u003e\n\u003cdiv style=\"text-align:left\" align=\"left\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003e\u003cspan style='font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:22px\"\u003eFosi Audio P4 HiFi Preamplifier: 3 RCA Inputs, EQ\/Bypass, Swappable Op-Amps, Treble \u0026amp; Bass Tone Control For Audiophile Systems\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:20px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eFeatures:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"a-unordered-list a-vertical a-spacing-mini\"\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eStudio-Level Signal Accuracy | ±0.1dB Frequency Response \u0026amp; 105dB SINAD\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003ePure, untainted reference-quality sound, tailored for discerning ears.\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003eWith a flat frequency response from \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003e20Hz to 20kHz (±0.1dB)\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e and a \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003e105dB SINAD\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e (Signal-to-Noise Ratio + Distortion), the P4 achieves nearly lossless signal transmission. Featuring\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003e Japanese Elna audio capacitors\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e and \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eOmron gold-plated signal relays\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e, it eliminates current noise to ensure every detail is faithfully reproduced, rivaling the performance of high-end preamps costing tens of thousands.\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eThree-Input Hub | One-Touch Switch Between CD, Vinyl, and DAC\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eSay goodbye to constant plugging and unplugging, and build a multi-device Hi-Fi system\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e.\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eThree independent RCA inputs\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e allow you to simultaneously connect a turntable (with external phono preamp), CD player, and high-end DAC. With the \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003einfrared remote\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e, you can easily switch between sources with a single button press. Whether you’re enjoying your classic vinyl collection or streaming Hi-Res music, simply press a button to experience seamless listening.\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eGain Staging + Motorized Potentiometer | Precision Matching for Power Amplifiers\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003ePerfectly adaptable from low-sensitivity to high-resolution systems.\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003e3dB\/6dB\/9dB Gain Adjustment:\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e▸ \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eLow Gain (3dB):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e Protects sensitive power amplifiers from overload distortion.\u003cbr\u003e▸ \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eHigh Gain (9dB):\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e Reduces system noise floor and enhances dynamic range.\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eThe ALPS vintage motorized volume knob\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e uses an analog potentiometer structure with left-right channel error \u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003e\u0026lt;0.1dB\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e, ensuring smooth, unbiased volume control.\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eTone Control Freedom | Adjustable EQ + Replaceable Op-Amps + Bypass Mode\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eFrom precise monitoring to personalized sound tuning, a dual-purpose machine.\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eMidpoint-adjustable bass and treble:\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e Compensate for room acoustics or enhance rock\/jazz atmospheres.\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eHi-Fi Bypass Mode: \u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003eDirect signal path with the EQ circuit bypassed, delivering uncolored, high-resolution sound.\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eReplaceable op-amp design: \u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003eCompatible with popular dual-op-amp chips (such as MUSES02\/OPA2604), allowing you to easily customize the sound signature to your preference—whether it's a \"warm tube-like\" or \"crisp, analytical\" tone.\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eMinimalist Control Aesthetic | Full-Function Remote + Compact Metal Chassis\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003eIdeal for both desktop and rack setups, blending seamlessly into high-end systems.\u003cbr\u003eComprehensive remote control: \u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003ePower on\/off, switch inputs, and adjust volume\/mute without the awkward \"bending over to find the knob\" experience.\u003cbr\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e\u003cstrong\u003ePRE OUT Output:\u003c\/strong\u003e\u003c\/span\u003e\u003cspan style=\"font-size:16px\"\u003e Connect an active subwoofer for a 2.1 system, or link multiple amplifiers for multi-room audio.\u003c\/span\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan style='font-size:20px;font-family:\"times new roman\", times, serif'\u003e\u003cspan style=\"font-size:20px\"\u003e\u003cstrong\u003eHighlight:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul class=\"a-unordered-list a-vertical\"\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eModel: P4\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003ePower Adapter Output: 12V\/1.5A\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eProduct Adapter Input Voltage Range: AC 110V - 240V\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eSNR ≥ 110dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eTHD ≤ 0.003%\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eTreble adjustment range: ±6dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eBass adjustment range: ±12dB\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eInput Mode: 3 RCA\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eOutput: RCA\/AUX\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:16px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003eFrequency Response: 20HZ -20KHZ((±0.1dB)\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style='font-size:20px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan class=\"a-list-item\" style='font-size:20px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003ePackage Include:\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e*P4 Preamplifier x1\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e*Power Adaptor x1 \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan class=\"a-list-item\" style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e\u003cspan style='font-size:14px;font-family:\"lucida sans unicode\", \"lucida grande\", sans-serif'\u003e*User Manual x1\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sc3a15a4a5b474f238ba5709899f6a177Q.jpg\" slate-data-type=\"image\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sf110562b47f74908be1f9306097f0751o.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sb4071d54ffce4522aeeecdbd1b1c839b4.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S3855d94315a245a6b247055950376438I.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S43d7192563b1412f8f7c298f148f79d3q.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se450001a15a44479a78a4e57b5d679e23.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sb3d4ea645a1b4db59d956f4d92f3ae46U.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se44c7e57a1274c23af4ed644c9c5bcb1Y.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Se6660eca10754698bf0ecc6ad27e644af.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S7b01721bdda942ab981b122eccc5b2a4x.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sdbb73db8037d486dad625e8d53069840t.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S92631ea0f3684a4a95a46d02b066581eQ.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S9b1602c0d076492790cba0de3b081d21w.jpg\" slate-data-type=\"image\"\u003e\u003cimg 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