FIIO BTR3K Heaphone Amplifier Bluetooth 5.0 HD CSR8675 DAC 2xAK4377A

FIIO BTR3K Heaphone Amplifier Bluetooth 5.0 HD CSR8675 DAC 2xAK4377A
The BTR3K is a portable bluetooth receiver with DAC circuit & balanced headphone amplifier. It works thanks to a Qualcomm CSR8675 24-bit Bluetooth 5.0 chip, which gives it all the flexibility of lossless protocols (apt-X HD & LDAC) while ensuring that audio streams are received as transparently as possible.

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Shipping date: 31-01-2023.

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FIIO BTR3K

Bluetooth Receiver 5.0 CSR8675 / DAC 2xAK4377A Balanced


The BTR3K is a portable bluetooth receiver with DAC circuit & balanced headphone amplifier. It works thanks to a Qualcomm CSR8675 24-bit Bluetooth 5.0 chip, which gives it all the flexibility of lossless protocols (apt-X HD & LDAC) while ensuring that audio streams are received as transparently as possible.

Taking advantage of Fioo's know-how, this version inherits the dual crystal oscillator architecture introduced with the BTR5 and offers increased performance with high sampling frequencies.

Two AKM AK4377A chips fuel its analog stage. This robust balanced conversion and amplification circuit can deliver up to 78mW at 32 Ohms with an S/N ratio of 122dB and a distortion level of -107dB. An ideal power reserve to make the most of your balanced headset on the go.

Qualcomm CSR8675 Bluetooth 5.0


At the heart of the BTR3K is a Qualcomm CSR8675 24-bit Bluetooth 5.0 chip. This component is a proven benchmark for audiophile applications with expanded support for all traditional & lossless protocols: SBC / AAC / apt-X HD / apt-X / apt-X Low Latency / LDAC. The CSR8675 chip is able to work with streams up to 24bit-96KHz depending on the codec and the capacities of the source.

In addition to its adaptive protocols that apply compression only when necessary, the receiver benefits from correction via its integrated 120MHz DSP. These correction capabilities are accessible to the user via the FiiO Music App which opens 4 audio filters as well as a 10-band graphic equalizer.

Dual Crystal Oscillators


The BTR3K uses the dual crystal oscillator architecture already introduced by Fiio with its BTR5.

This duo of 22.5792MHz & 24.576MHz clocks offers an ideal reference signal for both traditional consumer encodings and high resolution formats.

A welcome addition that limits the stability issues inherent in the encoding of high sampling frequency streams in a bluetooth transport.

Balanced 2x AKM AK4377A


The BTR3K's Bluetooth chip is accompanied by a duo of AKM AK4377A DAC chips, offering very good sound performance, with an extremely low distortion level of -107dB and a high signal-to-noise ratio of 122dB.

These two chips are integrated in balanced mode and each dedicates all of its computing power to its own channel. In addition to compatibility with balanced headphones, this type of design significantly increases performance in terms of crosstalk (118dB on its balanced output).

This chip also acts as a headphone amplifier delivering 25mW under 32 Ohm oni ts single-ended output and 78mW under 32Ohm on its balanced output.

330mAh Battery


A 330mAh battery powers the BTR3K receiver. Thanks to the ultra-low-power operation of the CSR8675 Bluetooth chip, the battery can offer up to 11 hours of autonomy (depending on the charge opposed by the headphone).

The charging circuit is extremely efficient since it allows the BTR3K's battery to be fully charged in just an hour and a half.

Likewise, charging is done with ease thanks to a USB-C connector compatible with all standard chargers for USB smartphones and tablets.

If connected to a computer, the device is also able to function as a USB DAC in addition to charging.

User Interface


The bluetooth circuit can keep two paired devices in its memory in order to be able to alternate swtich without requiring reconfiguration.

The CSR8675 chip has its own volume control which can be adjusted regardless of the source volume. This parameter remains memorized and allows precise and persistent adjustment even when the audio source changes regularly.

The BTR3K is compatible with CTIA signals from headphones equipped with playback controls and will integrate very easily into your bluetooth use habits.

Likewise, the device supports microphone / telephone control and can be used for telephone calls. In this use scenario, the entire conversation is processed with 8th generation noise cancellation technology from Qualcomm, which significantly benefits the clarity of conversations.

Comparaison of Fiio Devices

Device SpecFiiO BTR5FiiO BTR3kFiiO BTR3
BluetoothBT ChipCSR8675CSR8675CSR8675
BT VersionBT5.0BT5.0BT4.2
FormatSBC
AAC
aptX
aptX-LL
aptX-HD
LDAC
SBC
AAC
aptX
aptX-LL
aptX-HD
LDAC
SBC
AAC
aptX
aptX-LL
aptX-HD
LDAC
LHDC
USB DACUSB InterfaceXmos xuf208
384k/32bit;DSD256
CSRCSR
USB AUDIO CLASSClass 2Class 1Class 1
Audio performanceDual audio clockFPGA+45.1584M/49.152M24.576M/22.5792M
Audio DACES9218P*2AK4377A*2AK4376A
GainH/L
3.5mm HP out80mW@32O25mW@32O25mW@32O
2.5mm Balanced out220mW@32O78mW@32O
Noise floor (Balanced out)3.3uV2uV
Crosstalk (Balanced out)123dB(1KHz)118dB(1KHz)
SNR (A-weighted)121122120
Phase shift (Balanced out)0.08deg(10KHz)0.03deg(10KHz)
OthersIndicator&DisplayMatrix OLED 64*32RGB LEDRGB LED
In-line remote control support
USB typeType CType CType C
Battery550mAh330mAh300mAh
Working TimeSE: 9hSE:11h11h
MaterialAluminium alloy+GlassAluminium alloy+GlassAluminium alloy+Glass
APP control
SPECIFICATIONS
TypeRécepteur Bluetooth
Volume AdjustmentCan be adjusted independently from phone volume
Bluetooth ProfilesA2DP (enhanced),AVRCP,HFP,HSP
Bluetooth codec supportSBC/AAC/aptX/aptX LL/aptX HD/LDAC
Bluetooth ChipCSR8675
DAC / Headphone AmpAK4377A*2
USB DACSupported
Power/Pairing ButtonYes
Dedicated Pairing and Play ButtonsYes
Dedicated Volume ButtonsYes
Reception RangeApprox. 30 m (unobstructed),LDAC (quality priority 4 m)
Format IndicatorSBC:Blue、AAC:Cyan、aptX HD:Yellow
aptX/aptX LL:Purple、LDAC:White
Hands-free Calling with MicrophoneSupported
Voice Assistant ActivationSupported
In-line ControlsSupported
NFCNot supported
Audio Outputs2.5mm、3.5mm headphone jacks
USB ConnectorType-C
Battery330mAh
Battery LifeApprox. 11 hours
Charging Time1.5 hours
Check battery on mobledeviceSupported (Android device support for functionality will vary)
Auto Standby if no audio signalSupported
Dimensions58×25×11mm
Weight23.5g
 
Data sheet
InputBluetooth
InputUSB
OutputJack 2.5mm
OutputJack 3.5mm
DAC / ADC ChipAK4377
ColorBlack
ClassClass D / T
Remote ControlNo
Transmission / Reception protocolBluetooth
 
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FIIO BTR3K Heaphone Amplifier Bluetooth 5.0 HD CSR8675 DAC 2xAK4377A
The BTR3K is a portable bluetooth receiver with DAC circuit & balanced headphone amplifier. It works thanks to a Qualcomm CSR8675 24-bit...

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