A portable Hi-Fi speaker that supports Bluetooth. Equipped with a pair of 4-inch bass driver and neodymium tweeter, it delivers powerful and high-quality sound that is hard to imagine considering its size. In addition to line input, Bluetooth input, and FM radio tuner, OB-4 is equipped with a disc mode that allows you to play metronome, ambient sounds, etc. from inside.

What's more, the sound coming from the speakers is recorded on a background tape, and you can easily rewind, change playback speed, and loop at your fingertips. Also, the tape knob is unique in that it moves by itself according to playback.

Main specifications

Frequency characteristics: 50Hz – 25kHz

Amplifier: 38W x 2 (Ultra High Efficiency Class D)

Maximum sound pressure level: 92 db (peak @ 1m)

Maximum bass level: 104 db SPL (peak @ 1m)

Tweeter: High efficiency ferrofluid cooled neodymium driver

Woofer: Long throw high power capacity neodymium driver

Wireless standards:

Bluetooth Classic (AAC)

Bluetooth 5LE

FM radio

Input format: 3.5mm stereo mini (2.8Vpp at 0 dBFS)

Estimated playback time:

FM radio playback at normal volume: 72 hours

Bluetooth loud playback: 8 hours

Materials: Amorphous polymer glass fiber/reinforced plastic/rolled aluminum

Power requirements: AC 110-240V 50~60hz (universal built-in power supply)

Size: 232.5 x 284 x 57.5(mm)

Weight: 1.7kg

Accessories: Main power cable/dedicated antenna