Teenage Engineering OB-4 Orange

Teenage Engineering OB-4 Orange – a portable high-fidelity Bluetooth loudspeaker featuring revolutionary endless tape loop technology and exceptional sound quality. Built around four tailor-engineered speaker elements including two 4-inch long-throw neodymium woofers and a pair of high-efficiency ferrofluid-cooled neodymium tweeters, delivering 76W total power (2 × 38W ultra-high efficiency Class-D amplification). The OB-4 continuously records everything you listen to on a rolling 2-hour loop tape, allowing instant rewind, time-bending, and remixing of any audio source. Features multiple input modes including line-in, Bluetooth (Classic AAC and BLE 5), FM radio with smart antenna, and experimental disk mode with evolving features like ambient, karma, metronome, noise, and loop functions.

Engineered with a flow-optimized bass reflex duct and semi-unified chamber design, the OB-4 delivers crystal-clear, open natural sound with deep bass response from 52 Hz to 25 kHz. The unique motorized user interface features a brushless motor with hall effect sensor and intelligent control algorithm, enabling intuitive interaction through custom direct-drive volume knob and tape dial. The minimalist design houses sophisticated technology beneath its ultra-thin 'orthobook' form factor, with fine-pitch tweeter grille, gel-dampened handle, and UV-resistant orange paint finish. The adjustable folding handle doubles as a stand and houses an integrated smart spiral antenna for enhanced FM reception in challenging environments.

With an exceptional high-capacity lithium-polymer battery delivering up to 72 hours of FM radio listening or 40 hours average Bluetooth playback (8 hours at maximum volume), the OB-4 provides unmatched portability and endurance. The speaker platform supports wireless control via the Orthoplay app (iOS/Android) and optional Ortho Remote, compatible with all major streaming services including Spotify and Apple Music. Disk mode serves as Teenage Engineering's public research space for experimental features, currently offering ambient drone generation, 30-in-1 karma mantra box, metronome with 808 pitch adjustment (1-800 BPM), white/brown/pink noise generator, and on-device loop creation with beat matching. Designed and manufactured in Czech Republic with amorphous polymer glass fiber-reinforced PC and milled aluminum construction, complete with mains power cable and antenna.

KEY FEATURES

• Endless 2-hour rolling loop tape with instant rewind and remix capability
• Four tailor-engineered speaker elements: 2 × 4" woofers + 2 × neodymium tweeters
• 76W total power output: 2 × 38W ultra-high efficiency Class-D amplifiers
• Maximum SPL: 92 dB unsupported wideband, 104 dB bass capability @ 1m
• Extended frequency range: 52 – 25,000 Hz for full spectrum reproduction
• Flow-optimized bass reflex duct with semi-unified chamber design
• Multiple input modes: line-in (3.5mm), Bluetooth (Classic AAC + BLE 5), FM radio
• Low-latency line input ideal for instruments and studio monitoring
• Experimental disk mode: ambient, karma, metronome, noise, loop functions
• Motorized user interface with brushless motor and hall effect sensor
• Custom direct-drive volume knob and interactive tape dial
• Smart spiral antenna integrated into folding handle
• Exceptional battery life: 72 hours FM, 40 hours average Bluetooth, 8 hours max volume
• Wireless control via Orthoplay app and Ortho Remote compatibility
• Ultra-thin 'orthobook' portable design with gel-dampened handle/stand
• UV-resistant orange finish with fine-pitch tweeter grille

TECHNICAL SPECIFICATIONS

• Speaker principle: Flow-optimized bass reflex duct and semi-unified chamber
• Configuration: Stereo 2+2 (2 woofers + 2 tweeters)
• Tweeter: High-efficiency ferrofluid-cooled neodymium driver
• Woofer: 4-inch long-throw high-power capacity neodymium driver
• Active crossover frequency: 3.5 kHz
• Frequency range: 52 – 25,000 Hz
• Maximum SPL @ 1m stereo: 92 dB unsupported wideband
• Bass capability @ 1m: 104 dB SPL supported
• Amplifier: 2 × 38W ultra-high efficiency Class-D
• Total power output: 76W (~100 dB SPL in room)
• Wireless connectivity: Bluetooth Classic (AAC codec), Bluetooth 5 Low Energy
• FM radio: Integrated tuner with smart antenna system
• Line input: 3.5mm stereo jack (2.8 Vpp for 0 dBFS)
• Loop tape: Rolling 2-hour continuous recording buffer
• Battery type: High-capacity lithium-polymer (LiPo)
• Battery life: 72 hours normal FM / 40 hours average Bluetooth / 8 hours high volume
• Power supply: Universal built-in AC 100-240V 50/60Hz
• Dimensions: 232.5 × 284 × 57.5 mm (W × H × D)
• Weight: 1.7 kg (3.75 lbs)
• Materials: Amorphous polymer glass fiber-reinforced PC and milled aluminum
• Color finish: Orange with UV-resistant paint
• Design features: Fine-pitch tweeter grille, gel-dampened handle, direct-drive controls
• Handle function: Adjustable carrying handle doubles as stand, houses antenna
• Control interface: Motorized volume knob and tape dial with brushless motor
• App compatibility: Orthoplay (iOS/Android) for wireless control and updates
• Compatible accessories: Ortho Remote, shoulder strap, mesh carry bag (sold separately)
• HARM code: 8518220000
• Country of origin: Czech Republic
• Included accessories: Mains power cable, smart spiral antenna, user manual