RETRO BOX Desktop Bluetooth Speaker

-Compatible with FIIO JM21/M21/M33 players
-Bluetooth/USB DAC modes
-High-resolution LDAC Bluetooth
-2+2 acoustic design
-5 W + 5 W full-range power
-10.5 hours of extremely long battery life
-Hi-Fi/Retro sound presets
-Built-in microphone

Dual-Core Acoustic Design – Every Seat Is the Best Seat
With two dedicated speakers and two passive radiators housed in separate chambers, your sound remains clear and free of crosstalk. Thanks to this design, the speaker fills every corner of your room with rich and immersive sound—making every spot a “sweet spot.”

*The speakers are offset to the side to make room for the player. This side-firing design creates a more even and balanced sound field that distributes the music more effectively throughout the room.

Tireless performance, lasting impression
Two 18500 batteries are connected in parallel to minimize internal resistance and supply the two-channel amplifier with ample power. The result is a robust continuous output of 5 W + 5 W, allowing the two 40-mm drivers to reach their full potential—experience a rich and powerful sound with impressive dynamic range.

Dual-Mode Connectivity, Hi-Fi Anywhere
Bluetooth Mode: Features Bluetooth 6.0 and LDAC support. Experience refined, near-lossless sound quality even over a wireless connection.
USB DAC mode*: Connect the speaker directly to your desktop or laptop PC to transform it into a high-end audio station—complete with high-quality speakers that deliver an immersive, wired listening experience.
*The USB port is used for both data transfer and power supply. The speaker automatically charges or draws power as soon as it is connected. FiiO recommends avoiding connection to smartphones or tablets to prevent rapid battery drain.

Tailor your sound preferences—for every playlist
A built-in high-performance DSP chip lets you choose from HiFi, Retro, Pop, and Warm presets to suit any genre.
*Simply press the volume control down to switch between profiles and find the sound that perfectly matches your taste.

Package Contents
-RETRO-BOX*1
-USB data cable*1
-M21 and JM21 mounting insert*1
-Quick Start Guide*1
-Warranty card*1
-User manual*1

Technical Specifications
Dimensions: approx. 152.8 x 98.8 x 76 mm (excluding feet and controls)
Weight: approx. 683 g
Color: White/Black
Operating modes: Bluetooth reception mode/USB DAC mode
Bluetooth reception: V6.0, supports SBC/LDAC
Power supply: DC 5 V ≥ 2 A
Charging time: approx. 2.5 h
Battery life: approx. 10.5 h (Data from FIIO Labs in SBC format. Actual performance may vary depending on the music source and usage conditions)
Speaker parameters: 2 × 40 mm 4 Ω full-range speaker drivers
Frequency response: 65 Hz–20 kHz
Output power: 5.3 W × 2
Supported sampling rates for USB DAC: 44.1 kHz/48 kHz/96 kHz, 16/24/32-bit