{"product_id":"teenage-engineering-ob-4-black","title":"Teenage Engineering OB-4 black","description":"\u003cdiv lang=\"en\"\u003e\n\u003cstrong\u003eTeenage Engineering OB–4 black\u003c\/strong\u003e is a portable hi-fi loudspeaker in matte black, designed and built by Swedish manufacturer Teenage Engineering. The design combines two 4-inch long-throw neodymium woofers with ferrofluid-cooled neodymium tweeters, a 2×38 W Class-D amplifier, and an FM tuner with continuous rolling-loop recording — all in a glass fibre reinforced polycarbonate and milled aluminium enclosure.\n\n\u003ch3\u003eMotorized interface and continuous capture of everything you play\u003c\/h3\u003e\nThe volume knob and tape dial are not conventional encoders — they are driven by a brushless DC motor controlled by a Hall effect sensor and an intelligent motor control algorithm. Both elements have digitally managed resistance and motion, allowing the user to literally grab the signal mid-playback and scrub through it with their fingers. OB–4 continuously records everything it plays on a rolling 2-hour loop — Bluetooth streams, FM radio, and line-in sources alike. Real-time FM rewind is a feature absent from any other portable loudspeaker in this size class. Disk mode is a separate space for experimental features distributed through firmware updates: currently available functions include ambient, karma, metronome, noise, and loop.\n\n\u003ch3\u003eStudio use and connectivity\u003c\/h3\u003e\nThe 3.5 mm line input with low latency allows OB–4 to connect directly to an instrument, turntable, or audio interface as a portable studio monitor. FM sync enables wireless connection with the OP–1 field via radio signal. Bluetooth Classic handles AAC streaming; Bluetooth 5 LE covers volume control via the orthoplay app and the ortho remote. The folding carry handle houses a built-in spiral antenna for FM reception and doubles as a listening stand. The LiPo battery delivers up to 72 hours in FM mode, 40 hours over Bluetooth, or 8 hours at maximum volume.\n\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo 4-inch long-throw neodymium woofers\u003c\/li\u003e\n\u003cli\u003eTwo ferrofluid-cooled neodymium tweeters\u003c\/li\u003e\n\u003cli\u003e2×38 W ultra-high efficiency Class-D amplifier\u003c\/li\u003e\n\u003cli\u003eActive crossover at 3.5 kHz, stereo 2+2 configuration\u003c\/li\u003e\n\u003cli\u003eFlow-optimized bass reflex duct with semi-unified chamber\u003c\/li\u003e\n\u003cli\u003eMotorized interface: brushless motor, Hall effect sensor, motor control algorithm — volume knob and tape dial\u003c\/li\u003e\n\u003cli\u003eContinuous 2-hour rolling loop recording — scrub and rewind FM and Bluetooth\u003c\/li\u003e\n\u003cli\u003eBluetooth Classic (AAC) + Bluetooth 5 LE\u003c\/li\u003e\n\u003cli\u003eFM tuner with smart spiral antenna integrated in handle\u003c\/li\u003e\n\u003cli\u003e3.5 mm stereo line input (low latency)\u003c\/li\u003e\n\u003cli\u003eDisk mode: ambient, karma, metronome, noise, loop (firmware-updated features)\u003c\/li\u003e\n\u003cli\u003eLiPo battery: up to 72 h (FM) \/ 40 h (BT) \/ 8 h (max volume)\u003c\/li\u003e\n\u003cli\u003eFolding handle — dual function: carry handle and listening stand\u003c\/li\u003e\n\u003cli\u003eCompatible with orthoplay app (iOS\/Android) and ortho remote\u003c\/li\u003e\n\u003cli\u003eMains power: AC 100–240 V 50\/60 Hz (universal built-in power supply)\u003c\/li\u003e\n\u003cli\u003eCountry of manufacture: Czech Republic\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFrequency range: 52 Hz – 25,000 Hz\u003c\/li\u003e\n\u003cli\u003eMax SPL @ 1 m (stereo, unsupported wideband): 92 dB\u003c\/li\u003e\n\u003cli\u003eMax SPL bass @ 1 m (supported): 104 dB\u003c\/li\u003e\n\u003cli\u003eActive crossover frequency: 3.5 kHz\u003c\/li\u003e\n\u003cli\u003eConfiguration: stereo 2+2 (2 woofers + 2 tweeters)\u003c\/li\u003e\n\u003cli\u003eAmplifier: 2×38 W, Class-D\u003c\/li\u003e\n\u003cli\u003eWireless: Bluetooth Classic (AAC) + Bluetooth 5 LE; FM radio\u003c\/li\u003e\n\u003cli\u003eInput: 3.5 mm stereo jack (line-in)\u003c\/li\u003e\n\u003cli\u003ePower: AC 100–240 V 50\/60 Hz, built-in universal power supply\u003c\/li\u003e\n\u003cli\u003eDimensions: 232.5 × 284 × 57.5 mm\u003c\/li\u003e\n\u003cli\u003eWeight: 1.7 kg\u003c\/li\u003e\n\u003cli\u003eMaterials: amorphous glass fibre reinforced PC, milled aluminium\u003c\/li\u003e\n\u003cli\u003eColor: matte black\u003c\/li\u003e\n\u003cli\u003eIncluded: mains power cable, antenna\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Teenage Engineering","offers":[{"title":"Default Title","offer_id":53813793587537,"sku":"43453","price":523.41,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/TeenageEngineeringOB-4black1.jpg?v=1779264348","url":"https:\/\/wrdtunes.com\/fr\/products\/teenage-engineering-ob-4-black","provider":"Wired Tunes","version":"1.0","type":"link"}