Teenage Engineering OB-4 Magic Radio Portable Bluetooth Speaker

The Teenage Engineering OB-4 (OB4, ortho book 4) is a portable stereo Bluetooth speaker and FM radio with a rolling loop recorder. Two 38 W class D amplifiers drive four speaker elements, it plays Bluetooth, FM radio, a 3.5 mm line input or recordings from its disk mode, and it keeps a rolling 2-hour recording of whatever it plays so you can rewind the radio. It runs on its built-in battery or straight from AC power.

The motorized volume knob and tape reel respond to your fingers, a smart antenna is built into the handle, and the handle folds out to work as a stand. Choose black, gray, ochre or navy on this listing; the orange finish is discontinued.

OB-4 specifications

Type	Portable stereo Bluetooth speaker, FM radio and loop recorder
Amplifier	2 x 38 W, class D
Speakers	4 elements in a 2 + 2 stereo layout: ferrofluid-cooled neodymium tweeters, long-throw neodymium woofers, bass reflex port
Frequency range	52 Hz to 25 kHz
Maximum SPL	92 dB wideband stereo at 1 m; bass 104 dB at 1 m
Crossover	Active, 3.5 kHz
Sources	Bluetooth (AAC, Bluetooth 5 LE), FM radio, 3.5 mm stereo line in, disk mode
Loop recording	Rolling 2-hour recording of playback; loops can be saved to disk mode
Battery	Built-in rechargeable. Up to 40 hours of Bluetooth listening, about 8 hours at high volume, about 72 hours of FM at normal volume.
Power	Built-in universal power supply, 100 to 240 V AC, 50/60 Hz
Controls	Motorized volume knob and tape reel, input and play buttons
Dimensions	9.2 x 11.2 x 2.3 in (232.5 x 284 x 57.5 mm)
Weight	3.75 lb (1.7 kg)
Colors on this listing	Black, gray, ochre, navy (orange discontinued)

What does the OB-4 loop recorder do?

The OB-4 keeps a rolling 2-hour recording of whatever it plays, like an endless tape. You can rewind the radio to hear something again, remix it with the reel, and save loops to disk mode.

How long does the OB-4 battery last?

Teenage Engineering rates it at up to 40 hours of Bluetooth listening, about 8 hours at high volume, and about 72 hours of FM radio at normal volume. It also runs straight from AC power through its built-in power supply.

What can I connect to the OB-4?

Any line-level source through the 3.5 mm stereo line input, and phones and laptops over Bluetooth with AAC.

Which colors are available?

This listing offers black, gray, ochre and navy. The orange finish is discontinued, and availability of each color is shown when you select it.