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. 

batch 2 ships nov 2020.
reserve now

watch full video

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-stretch 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.
*ROLLING 2 HOUR RECORDING

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 standard. syncs
with 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.

BRUSHLESS MOTOR, HALL EFFECT 
SENSOR & INTELLIGENT MOTOR 
CONTROL ALGORITHM.

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 call it, can become. for now, there are three functions on the disk; ambient, karma and metronome.



ambient

zone out to a drone generated
by snippets of a radio broadcast.

metronome

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

karma

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. 

OB–4 shop


matte black edition

$$$
reserve now

gloss red edition

$$$
reserve now


OB–4 leather bag

 premium leather bag and strap.
custom-made for OB–4.
$$$
add to cart

ortho remote

works seamlessly with OB–4 for
wireless volume control.
$$$
add to cart

BE THE FIRST TO EXPERIENCE OB–4. AVAILABLE AT THESE RETAILERS:

MOMA DESIGN STORE
81 SPRING ST A, NEW YORK, NY 10012

MOMA DESIGN STORE
44 W 53RD ST, NEW YORK, NY 10019

TOM DIXON
4-10 BAGLEY WALK, KINGS CROSS,
LONDON N1C 4DH

SCANDINAVIAN PHOTO
VASAGATAN 14, 111 20 STOCKHOLM

PANCHO AND LEFTY
DROTTNINGGATAN 4, 742 31 ÖSTHAMMAR, SWEDEN

yoga mantra

ambient

 fm radio

music

       metronome

     …more

technical

specifications

speaker principle
flow optimized bass reflex duct
and semi unified chamber.
frequency range
52 – 25000 Hz.
dimensions
232.5 x 284 x 57.5 mm
weight
1.7 Kg.
materials
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 zum 1m stereo configuration
92 db unsupported wideband
bass capability zum 1m
104 db SPL supported

active crossover frequency
3.5 kHz
configuration
stereo 2 + 2
tweeter
high efficiency ferrofluid cooled neodymium driver.
woofer
long throw high power capacity neodymium driver
amplifier
2 x 38W
ultra high efficiency class D
wireless
Bluetooth® classic (AAC)
Bluetooth® 5 LE
FM radio
inputs
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
colours
gloss red
matte black
included accessories:
main power cable
antenna
compatible add-ons:
ortho remote
shoulder strap
product name
OB–4 (ortho book 4)
HARM code
8518220000
country of origin:
czech republic

the magic radio.

OB–4

introducing OB–4

the incredible sounding portable 

hifi stereo with line-in, wireless audio, 

and the evolution of radio. the OB–4 memorises everything you play on an endless looping tape. rewind the radio 

and remix anything.

/products/ob-4

batch 2 ships nov 2020

reserve now

watch full video

what’s all the 

hocus pocus about?

OB–4 continuously memorises everything you listen to on an endless looping tape*. rewind, time-stretch and loop at the flick of your fingertips.

*ROLLING 2 HOUR RECORDING

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 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 is designed to support both high-definition bluetooth classic and 
the new ble audio standard. in the coming months we will add support for audio and midi over ble.

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 believe this is the next level ofuser experience.

turn your mind on

with disk mode.

this is where we will continuously

develop new experimental features

for the OB–4. for now, there are three functions on the disk; ambient, karma

and metronome.

ambient

zone out to a drone generated
by snippets of a radio broadcast.

metronome

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

karma

30 in 1 musical mantra box.
your spiritual companion.

the handle-stand

the iconic handle makes it a breeze 

to carry anywhere, and can even be used as a stand for a more relaxed 

listening position.

OB–4 shop

matte black edition

$$$
reserve now

gloss red edition

$$$
reserve now

OB–4 leather bag

premium leather bag and strap.
custom-made for OB–4.
$$$
add to cart

ortho remote

works seamlessly with OB–4 for
wireless volume control.
$$$
add to cart

technical

specifications

speaker principle
flow optimized bass reflex duct and semi unified chamber.
frequency range
52 – 25000 Hz.
dimensions
232.5 x 284 x 57.5 mm
weight
1.7 Kg.
materials
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 zum 1m stereo
configuration
92 db unsupported wideband
bass capability zum 1m
104 db SPL supported
active crossover frequency
3.5 kHz
configuration
stereo 2 + 2
tweeter
high efficiency ferrofluid cooled neodymium driver.
1 X USER’S MANUAL

woofer
long throw high power capacity neodymium driver
amplifier
2 x 38w
ultra high efficiency class d
wireless
Bluetooth® classic (AAC)
Bluetooth® 4 LE
fm radio
inputs
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
colours
gloss red
matte black
included accessories:
main power cable
antenna
compatible add-ons:
ortho remote
shoulder strap
product name
OB–4 (ortho book 4)
harm code
8518220000
country of origin:
czech rebuplic
1 X USER’S MANUAL

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