FiiO K7 BT

The Fiio K7 BT headphone amplifier enhances the design of the popular Fiio K7 by incorporating aptX HD, aptX Adaptive, and LDAC Bluetooth receivers, facilitating wireless music playback from smartphones, tablets, or computers. This amplifier, equipped with both analog and digital inputs, can also function as a USB DAC. With its dual AKM DAC, the Fiio K7 BT supports PCM files up to 32-bit/384 kHz and DSD256. Its THX amplification, coupled with dual balanced and unbalanced headphone outputs, ensures seamless connectivity with a variety of headphones.

The Fiio K7 BT headphone amplifier is incredibly versatile, featuring both analog and digital inputs to easily connect to all your audio sources. It includes an asynchronous USB port for seamless music playback from Windows or Mac computers, facilitated by the high-precision XMOS XUF208 controller to optimize file playback. With its dual AKM AK4493S DAC, independent conversion of left and right channels is achieved, minimizing interference and maximizing the signal-to-noise ratio. The dual DAC configuration allows support for PCM streams up to 32 bits / 384 kHz and DSD up to DSD256.

Utilizing the THX AAA 788+ amplifier module, identical to the one found in the top-of-the-line Fiio K9 Pro ESS, the Fiio K7 BT delivers robust amplification power and high-quality sound comparable to premium Class A amplifiers. The THX AAA technology ensures precise reproduction with zero noise, low distortion, and an extended frequency response from 20 Hz to 50 kHz, enhancing the details in HD recordings. Additionally, the Fiio K7 BT is Hi-Res Audio certified.

Equipped with a QCC5124 Bluetooth controller, the Fiio K7 BT allows for wireless music streaming from smartphones, tablets, or computers. Supporting aptX, aptX HD, and LDAC codecs, it ensures excellent audio quality and preservation of music details. The amplifier is also Bluetooth aptX Low Latency and aptX Adaptive compatible, enabling lag-free transmission for watching TV without audio delays.

In summary, the Fiio K7 BT headphone amplifier presents a comprehensive and high-performance solution for effectively powering a wide range of headphones or earphones, while also efficiently decoding the audio from various digital sources.

• Name/Model No.: K7 BT
• Color:Black
• Weight:=610g
• Size:  12 x 16.8 x 5.5 centimeters
• Maximum supported sampling rate:
  • PCM 384kHz-32bit/DSD256(USB DAC)
  • PCM 192kHz-24bit(COAX)
  • PCM 96KHz-24bit(OPT)
• Recommended headphone impedance: 16~300?
• Hardware solution:
  • DAC: AK4493S*2 , USB: XMOS XUF208
  • Voume IC:NJU72315 * 2
  • AMP:THX AAA 788+ * 2
• Volume Scroll: Potentiometer+ADC Sampling
• FiiO Control: K7 BT supported
• Firmware upgrade: XMOS can be upgraded via USB
• Sampling rate indication:
  • Blue:44.1KHz/48KHz
  • Yellow:88.2/96/176.4/192/352.8/384KHz
  • Green:DSD64/128/256

BUTTONS AND INTERFACES:

• Buttons: input button*1+gain switch*1+output switch*1
• LINE IN: RCA sockets
• OPT IN: TOSLINK
• BAL PO: Standard 4.4mm port
• USB: USB B(data)
• LINE OUT: RCA sockets
• COAX IN: RCA sockets
• SE PO: Standard 6.35 mm port

POWER PARAMETERS:

• Power supply: DC 12V/2A

AUDIO PARAMETERS:

• Line output performance parameters:
  • Frequency response:
    • 20Hz~20KHz:±<0.4dB(UAC)
    • 20Hz~20kHz:±<0.8dB(SPDIF IN)
    • 20Hz~50KHz:±<2.2dB(UAC)
    • 20Hz~50kHz:±<1.7dB(SPDIF IN)
  • THD+N: <0.0005%(1kHz/10k?/dbA)
  • Crosstalk: = 102dB (1kHz/10k?)
  • Noise floor: <3uV(dbA)
  • SNR: = 116dB (dbA, UAC)
  • Output level: = 2Vrms
• Headphone output performance parameters(6.35mm):
  • Output power1: L+R= 1220mW+1220mW(32? /THD+N<1%)
  • Output power2: L+R= 140mW+140mW(300? / THD+N<1%)
  • Frequency response:
    • 20Hz~20KHz:±<0.3dB(UAC)
    • 20Hz~20kHz:±<0.7dB(SPDIF IN )
    • 20Hz~50KHz:±<2.1dB(UAC)
    • 20Hz~50kHz:±<1.6dB(SPDIF IN )
  • THD+N: <0.0003% (1 kHz/32?/dbA)
  • Output impedance: <1?(32?)
  • Crosstalk: = 77dB (1 kHz/32?)
  • Noise floor:
    • <3.1uV(dbA, AUX IN)
    • <4.4uV(dbA, UAC)
  • SNR:
    • = 128dB (dbA, AUX IN)
    • = 120dB (dbA, UAC)
  • Peak output voltage: = 18.9Vpp
• Balanced headphone output performance parameters(4.4mm):
  • Output power2: L+R= 2000mW+2000mW(32? /THD+N<1%)
  • Output power3: L+R= 560mW+560mW(300? / THD+N<1%)
  • Frequency response:
    • 20Hz~20KHz:±<0.3dB(UAC)
    • 20Hz~20kHz:±<0.7dB(SPDIF IN )
    • 20Hz~50KHz:±<2.1dB(UAC)
    • 20Hz~50kHz:±<1.6dB(SPDIF IN )
  • THD+N: <0.0003% (1 kHz/32?/dbA)
  • Output impedance: <1?(32?)
  • Crosstalk: = 124dB(1 kHz/32?)
  • Noise floor:
    • <5.1uV(dbA, AUX IN)
    • <7.7uV(dbA, UAC)
  • SNR:
    • = 128dB (dbA, AUX IN)
    • = 120dB (dbA, UAC)
  • Peak output voltage: = 37.7Vpp