Aimed at audiophiles and music enthusiasts, the high-fidelity FiiO K9 is a compact desktop USB DAC and headphone amplifier that faithfully reproduces your music when listening to audio from your computer, smartphone, tablet, or other digital music player. The K9 utilizes the high-performance ESS ES9068AS DAC to deliver rich audio details and a superior performance at up to 32-bit / 768 kHz PCM and DSD512.

The device is equipped with 4.4mm and stereo RCA analog line, and optical, coaxial, and USB-B digital inputs. Selectable LO, PRE, and PO output configurations give you access to a combination of headphone output connectors including 1/4", balanced 4.4mm, and 4-pin XLR, and line outputs: RCA and balanced XLR-3. The K9 acts as a bridge between your computer, mobile phone, speakers, and headphones, allowing them to work together seamlessly. Switchable low-, medium-, and high-gain levels are available, enabling you to use the amplifier with almost any headphones at comfortable volume levels.

For Computers, Phones, Music Players    Dual High-Performance ESS ES9068AS DACs    USB/Coaxial/Optical/RCA/4.4mm Inputs    RCA and Balanced XLR-3 Stereo Line Outs    1/4", XLR-4, and 4.4mm Headphone Outputs    Supports Up to 32-Bit / 768 kHz DSD512    QCC5124 Bluetooth Chip    RCA and XLR Line Outputs    RGB Light-Ring Indicator, 3 Gain Levels    Includes Power Cord, USB Cable & Stand

• Drive power-hungry headphones (desktop USB audio + headphones)
• Connect to home audio setups (desktop USB audio + active speakers)
• USB-B connector (with included USB-B to USB-C cable) for easy connection to USB-C mobile devices
• RCA + XLR-3 balanced line out (for active speakers, monitors, external amplifiers)
• Connect to mobile devices (players, computers)
• Built-in Bluetooth Low Energy (BLE) technology allows you to use the FiiO Control app to control functions like filter selection, channel balance, and more even when not in Bluetooth mode.

Inside the K9 uses dual cores, ES9068AS*2 DAC | THX AAA 788+ amplifier, renowned in the audio industry for soul-shaking sound, supporting up to 32-bit / 768 kHz and native DSD512 audio.

The THX AAA 788+ chips (also found in the K9 Pro) provide exemplary details and dynamics no matter if you are using low or high-impedance headphones. Isolated digital and analog section power supply provides a pure background for your sound. 

From the DAC, to the volume adjustment, to the amplification, every part of the K9 is truly balanced for greatly reduced crosstalk and more authentic sound. The PCB of the K9 features a partitioned layout, fully separating the major sections of the audio circuit, which guarantees the integrity of the audio signal being processed.

• Electricity is the mother of sound, so special attention was paid to optimizing the K9's power supply to ensure excellent sound. The K9's linear power supply, with its four massive 4700uF capacitors, makes sure that the rest of the system gets abundant clean power, continuously.
• The digital portions of the K9 physically receive power separately from the analog portions, for effective shielding against audio interference between the two circuits. This ensures pure and faithful reproduction of your music.
• Besides the special high-performance linear power supply, the power stabilization and filtering within the audio circuit is also a big contributor to the K9's excellent sound. Specifically, in each stage of the audio circuit, ultra-low-noise LDOs are employed for voltage regulation.

A dual-mode clock management design is utilized for the K9. Accurate and stable dual-mode clock management allows the K9 to easily play back high-resolution audio with the greatest fidelity, as if you were there with the performing artists.

The K9 employs the Qualcomm QCC5124 chip to handle Bluetooth duties, with support for formats such as LDAC, aptX HD, and aptX Adaptive. This chip ensures that Bluetooth connections are both reliable and quick, satisfying both the low latency needs for games/videos and the high bitrate necessary for high-resolution audio.

Adjusting the volume may look like a simple concept, but a good execution of it is crucial to an excellent audio experience. The ADC curve reconstruction method of volume adjustment used in the K9 effectively minimizes any left-right channel volume imbalance and noise. It also results in a smooth change of volume across 120 levels of volume. This attention paid to the simple process of volume adjustment is just another layer to making sure you truly savor your music with the K9.

The RGB indicator lights surrounding the volume knob can light up differently depending on the currently playing sample rate and Bluetooth format, and give the K9 and its surrounding desk space some fun personality.

The K9 supports both UAC1.0 and UAC2.0 modes, allowing you to use the K9 with either devices that are simply plug-and-play or with devices that can work with the K9 and an additional driver for even better compatibility. And the FiiO Control App allows you to easily switch between UAC1.0 and UAC2.0 modes.

Through the FiiO Control app, you can quickly switch between seven music tuning style presets on the K9. If the selected tuning style fits the music you are listening to, you can acquire a more vivid and pleasant experience. If the preset tuning is not to your liking, the three self-define PEQ designs will help you to finely adjust to your favorite listening style.

Featuring an all-aluminum construction made from an integrated stretching + CNC process to ensure the body's strength and precise finish, the K9 sits on your surface handsomely in either a horizontal or vertical orientation.

Related Questions and Answers

Q: 1. Can I leave it on all the time if it is plugged into a charger?

A: The FiiO BTA30 Pro High-Fidelity Bluetooth Transmitter/Receiver (BH # FIBTA30PRO) may be left powered on all the time and plugged into a charger.

Q: 2. What comes in the box?

A: The FiiO BTA30 Pro High-Fidelity Bluetooth Transmitter/Receiver BH #FIBTA30PRO includes: In the Box FiiO BTA30 Pro High-Fidelity Bluetooth Transmitter/Receiver USB Type-C Cable RCA Cable Isolation Feet Limited 1-Year Warranty

Q: 3. Can I listen to the tv at the same time someone hard of hearing uses a bluetooth headphones?

A: It depends on the model of your TV. Some models allow audio to go through the internal speakers of the television while using the optical audio output on that same television going into the Fiio BTA30 Pro.

Q: 4. Can be connected to a Mac to download file?

A: Yes. Page 13 in the manual for the FiiO M17 shows how to connect it to a Mac computer. https://www.bhphotovideo.com/lit_files/800196.pdf

Q: 5. What is aprox. transmission range of FiiO BTA30 PRO? other B&H units cite from 65-ft to 300-ft; info is curiously missing here

A: The FiiO BTA30 Pro High-Fidelity Bluetooth Transmitter/Receiver has an approximate transmission range of 100 ft.

Q: 6. Does this have 2 RCA outputs? I need to avoid a splitter to eliminate radio station interference when I use a splitter.

A: The FiiO K7 BT Desktop USB DAC and Headphone Amplifier with Bluetooth (B&H # FIK7BT) has a Stereo RCA coaxial line output, as well as a 1/4" TRS headphone output.

Q: 7. I want play music from my cell phone in my old stereo amplifyer. Will the volume be low or normal?

A: The FiiO BTA30 Pro High-Fidelity Bluetooth Transmitter/Receiver (BH # FIBTA30PRO) will produce a very useable level of volume. It has its own volume adjustment control knob with ADC curve reconstruction for precise and balanced sound.

Q: 8. Is the frequency of 5Hz to 80kHz the same for both a wired connect & a wireless connection?

A: The 5 Hz to 80 kHz frequency response range for the FiiO M17 Desktop-Class Digital Audio Player (B&H # FIM17) applies to all kinds of audio outputs available.

Q: 9. which apple airplay doe it support, 1 or 2? it is not clear

A: The FiiO R7 is Apple Airplay 1 compatible.

Q: 10. I want to use this as a Bluetooth transmitter on my receiver... the receiver only has RCA jacks.. there are no RCA inputs on the BTA30 Pro... any way to work around this?

A: Receivers do not typically have outputs available for compatibility with a bluetooth transmitter. Some receivers have an RCA output for Zone 2 output. You can use the Fiio BTA30 Pro as a bluetooth receiver with your AV receiver by going from the RCA Line Outputs into the included RCA cable and then into one of the RCA stereo inputs on your AV receiver. If your AV receiver has RCA output, you can use BH #GEATVDA to convert the signal to optical, so that you can go into the optical input of the Fiio BTA 30 Pro and use it as a transmitter.