something wonderful
find musical bliss
high fidelity stereo mono
analog digital tubes solid-state

Teenage Engineering OB-4


introducing OB–4, magic radio. the incredible sounding portable hifi stereo with line-in, wireless audio, and the evolution of radio. OB–4 memorizes everything you play on an endless looping tape. rewind the radio and remix anything. comes with a folding handle that doubles as a stand. ultra power efficient with up to a week of music listening.

the magic radio. OB-4

introducing OB–4, the portable high fidelity loudspeaker with two 4” bass drivers and a pair of neodymium tweeters that deliver crystal clear, open natural sound with 38 watts per channel — that’s around 100 decibels

of incredible sounding stereo. listen using line input, bluetooth, FM radio and disk. the interface is minimal, with only the things you really need. yet if you look below the surface, there’s a lot more than meets the eye. 

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what's all the hocus pocus about?

have you ever wished you could instantly rewind when listening to the radio, to hear the title of the song just played? OB–4 continuously memorises everything you listen

to on an endless looping tape*.rewind, time-bend and loop at the flick of your fingertips. on purpose or by accident. instant rewind on radio is just one of the OB-4’s magic tricks.


natural sound

four tailor-engineered speaker elements deliver pure quality sound and a stereo field that fills the entire room. a flow-optimised bass reflex duct delivers deep natural bass.

72 hrs listening

how about normal radio listening for a week without charging? the high capacity lipo battery delivers about
8 hours of noise at max volume, or an average of 40 hours on a single charge.

the wireless part

the OB–4 hardware platform supports both high-definition bluetooth classic and bluetooth low energy standards. workswith ortho remote for wireless volume control. 

smart antenna

we’ve spent years fiddling with the antenna so you won’t have to. and for those tricky listening places, we’ve included a fine-tuned smart spiral antenna that neatly integrates in the handle. 


motorized user interface.

use your fingers to grab, spin and interact with the sound. digital-motion controlled volume knob and tape reel. we call it the next level of user experience.

turn your mind on with disk mode.

if you skip the traditional inputs like line in, bluetooth and FM radio, you end up in disk mode. this is where we will continuously develop new experimental features for the OB–4. it’s our public research space,

where we allow ourselves to explore and prototype everything that this media-instrument, as we like to call it, can become. for now, there are three functions on the disk; ambient, karma and metronome.


zone out to a drone generatedby snippets of a radio broadcast.


high def stereo recording.1 beat per minute, up to 800.


30 in 1 musical mantra box.your spiritual companion.

the handle-stand

designed to be played outdoors, in public spaces and at high volume; carried on one shoulder with speaker elements facing the head. note: it is assumed that passers-by share the same musical taste.

or why not give it a home in your kitchen? with any luck, the iconic handle makes it a breeze to carry anywhere, and can even be used as a stand for a more relaxed listening position. 

bill amberg edition.

made in london by our friends at bill amberg studio. the OB–4 leather bag is the elegant protection you need when you walk the street in that high fashion district in a metropolitan city somewhere. or, when you just want to round off the edges of OB–4 and feel the soft touch of genuine leather.

ultra durable cow hide is hand stitched along four edges for a perfectly tailored and acoustically transparent fit. the detachable strap can be adjusted to several lengths. each of these first edition bags are unique and hand marked with an edition number. 

yoga mantra


fm radio




technical specifications

speaker principleflow
optimized bass reflex duct
and semi unified chamber.

frequency range
52 – 25000 Hz.

232.5 x 284 x 57.5 mm

1.7 Kg.

amorphous polymer glass fibre reinforced pc and milled aluminium.

design features
fine pitch tweeter grille, gel dampened handle, custom direct drive volume knob and tape dial.

max spl @ 1m stereo configuration
92 db unsupported wideband

bass capability @ 1m
104 db SPL supported

active crossover frequency
3.5 kHz

stereo 2 + 2

high efficiency ferrofluid cooled neodymium driver.

long throw high power capacity neodymium driver

2 x 38W ultra high efficiency class D

Bluetooth® classic (AAC)
Bluetooth® 5 LE
FM radio

3.5 mm stereo in
(2.8Vpp for 0 dBFS)

battery life
normal volume fm: 72 hours
bluetooth high volume: 8 hours

general power requirements
ac 110-240v 50~60hz
universal built-in power supply

gloss red
matte black

included accessories:
main power cable

compatible add-ons:
ortho remote
shoulder strap

product name
OB–4 (ortho book 4)

HARM code

country of origin:
czech republic

Brandstraat 28
9255 Buggenhout