FiiO BTR3K Bluetooth AMP+DAC

Captivating you through your fingers

The aluminum alloy body wrapped elegantly in an arc of 2.5D glass like that used in the latest smartphones, the oleophobic coating that keeps off fingerprints, the high contrast black lettering and the smooth texture give the compact BTR3K an elegant look that would not be out of place in a specialty

artisan's shop.

Now with balanced and SE output

Building off of what made the BTR3 so good, the BTR3K implements balanced output. It is a truly balanced design, with a DAC and amplifier carefully paired for the left and right channels each, for the purest sound possible.

Robust, Full-Bodied Sound High Performance AK4377A

With two high-performance AK4377A DACs, the power output has increased by 50% compared to the AK4376 used in the BTR3 as well as greatly improved measurements and actual sound.

Independent Dual Crystal Oscillators for Accurate Audio Reproduction

The dual crystal oscillator system in the BTR5 also comes to the BTR3K! The 22.5792M/24.576 MHz dual crystal oscillators mean that during Bluetooth and USB decoding, the BTR3K can more accurately reproduce audio signals under various sampling rates – due to greatly reduced jitter and greatly increased audio stability.

A Robust Inner Core Qualcomm CSR8675

The Qualcomm CSR8675 Bluetooth chip used in the BTR3K is a premium low-power solution designed for enhanced audio applications, with a 120 MHz DSP, support for 24-bit transmission and processing as well as abilities to decode multiple lossless Bluetooth codecs. No matter whether you watching videos, listening to music, or enjoying your favorite game, this chip will ensure you get excellent sound quality.

Speedy Bluetooth Connection

The BTR3K upgrades to Bluetooth 5.0, which means faster pairing and more stable signal strength for a better overall experience. It fully supports AAC/SBC/aptX/aptX LL/aptX HD/LDAC audio formats that you'll get the best sound quality possible from the BTR3K.

An Extremely Useful Little Light

With so many Bluetooth formats being used in various places, the RGB light indicator quickly tells you which format is currently being utilized.

Listen and Charge With Type-C

You can listen while charging with the USB Type-C connector.

As a matter of fact, the BTR3K takes only 1.5 hours to fully charge but allows for a lengthy 11 hours of playback!

Crystal-Clear Calls Free of Noise

The built-in amplifier in the BTR3k not only ensures your music sounds good, but that your calls do too. To further enhance your calling experience the BTR3k is not only equipped with omni-directional microphone and phone controls, it is also equipped with the eight generation Qualcomm cVc noise cancellation technology, which effectively suppresses background noise so that your call comes through as clear and audible as possible.

Flexibility Specialist Adapts to Various Kinds of Wired Headphones

The BTR3K can automatically tell what kind of headphones you plugged into it and adjusts its output accordingly. And when you plug in headphones with CTIA controls, you can use the microphone as well as the play/pause, volume, and track selection controls.

Great Connection Convenience Supports Pairing to 2 Devices Simultaneously

The BTR3K can be paired with and remember up to two Bluetooth devices at once, allowing for even more convenience. Simply use whichever device you want to pair the BTR3K anytime without hassle!

Quick and Convenient Volume Control

When you connect the BTR3K to your Bluetooth device, the device's volume and the BTR3k's volume can be adjusted separately, allowing you to better fine-tune the volume to your needs. The BTR3K also remembers your desired volume, so you don't have to adjust the volume to where you want it every time you use the device.

Give A Holler When You Need Help

Simply use the BTR3K to call up your smartphone's assistant without even having to pull it out.

Intelligently Puts Your Music At Your Fingertips

When your device is connected to the BTR3K and is using the FiiO Music app to play music, the BTR3K can be remotely controlled with the following functions.

Free to Go With You Wherever

You should be able to take your music with you wherever. The BTR3K comes with a symmetrical, detachable rear clip that allows you to easily carry it around.





 About 23.5 g(incl. battery)


About 58×25×11mm (exclusive of back clip)

Audio Input

 Bluetooth connection (Bluetooth 5.0 supported)

Supported Audio Format(s)

AAC/SBC/aptX/aptX LL/ aptX HD/LDAC

Headphone Output

3.5 mm stereo jack

Mic Function

Support Bluetooth call, built-in omnidirectional microphone; support external microphone of CTIA cable

Balanced Headphone Output

2.5mm jack

USB Port

Type C USB

Channel Balance

 ≤0.1 dB

Drive Ability


Volume Control

Side buttons


APP interconnection

Supports setting through App

Status Indicator Light

RGB light indicates the input Bluetooth audio codec,
charging and working status

Charging Time

≤1.5 h (DC 5V 500mA)

Bluetooth Codes Display


Battery Capacity

330 mAh

Power Input

Recommend DC 5V 500mA

Output Power

PO about 25mW(32Ω loaded)

Frequency Response

20Hz~20kHz (aptX connection)

PO about 50mW(16Ω loaded)

BAL about 78mW(32Ω loaded)

20Hz~40kHz (LDAC connection)

BAL about 40mW(16Ω loaded)


PO<0.003%(LDAC 1kHz A-weighted)

Output Impedance

PO≤0.3Ω(32Ω loaded)

BAL<0.002%(LDAC 1kHz A-weighted)

BAL≤0.5Ω(32Ω loaded)

Noise Floor

High power model& A-weighted
PO≤1.0uV BAL≤2.0uV


PO:0.9V(32Ω /THD+N<1%)

PO:  0.9V (no loaded)

Low Power model & A-weighted
PO≤4.5uV BAL≤4.5uV

BAL: 1.59V(32Ω /THD+N<1%)

BAL: 1.8V(no loaded)


PO≥119dB (32Ω  A-weighted)


PO≥ 73dB(1kHz 32Ω loaded)

PO≥ 114dB(1kHz no loaded)

BAL≥122dB(32Ω  A-weighted)

BAL≥ 108dB(1kHz 32Ω loaded)

BAL≥119dB(1kHz no loaded)

Sampling Rate Supported Up to

48kHz/16bit(USB DAC) 



Chips Used

DAC: AK4377 A* 2  , Bluetooth: CSR8675 


Type C USB charging cable*1, Quick Start Guide*1, Warranty Card*1,Back Clip*1

 Battery Life & Test Conditions (The test result is based on specified test conditions and just for reference)

Battery Life

Low Power model:BAL &P about 11h
High power mode:PO about 9.5H,BAL about 7.5H

Bluetooth Transmitter

iPhone (AAC)

Connected Headphones

M3 open earbuds(27Ω)


With set output at 40mV