FIIO K7 DAC Balanced Headphone Amplifier 2x THX AAA-788+ 2x AK4493S XMOS XUF208 32bit 384kHz DSD256

FIIO K7 DAC Balanced Headphone Amplifier 2x THX AAA-788+ 2* AK4493S XMOS XUF208 32bit 768kHz DSD256
With the K7, FiiO unveils a compact, high-performance headphone amplifier based on a high-quality technical design and high-end components. Within a completely balanced circuit, two THX AAA-788+ amplifier chips and a AK4493S dual DAC guarantee a powerful, dynamic and accurate sound.

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Reference : 17110
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229,00 €tax incl.

190,83 € tax excl.
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FiiO K7

Balanced Headphone Amplifier 2x THX AAA-788+ 2* AK4493S XMOS XUF208 32bit 768kHz DSD256

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

With the K7, FiiO unveils a compact, high-performance headphone amplifier based on a high-quality technical design and high-end components. Within a completely balanced circuit, two THX AAA-788+ amplifier chips and a AK4493S dual DAC guarantee a powerful, dynamic and accurate sound.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Balanced architecture

The FiiO K7 benefits from a fully balanced architecture with a 6-stage audio circuit. A design that allows it to considerably reduce crosstalk and to offer a pure and precise sound reproduction.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Dual THX AAA-788+ Amplifier

The heart of the FiiO K7, its amplifier stage, embeds two THX AAA-788+ chips, allowing it to develop an important power of 2x560mW under 300Ω or 2x2000mW under 32Ω. The amplifier is thus capable of accompanying both high impedance headphones and more sensitive headphones, while offering great musicality.

AKM AK4493SEQ Dual DAC

The digital/analog conversion stage is equipped with two AKM AK4493SEQ DAC chips, each responsible for decoding one channel. A powerful DAC, ensuring a quality, dynamic and musical sound reproduction.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

XMOS XUF208 USB Interface

The USB input of the FiiO K7 uses an XMOS XUF208 interface chip with dual clock management. This allows for fast and accurate decoding of USB signals. Furthermore, this chip supports high-resolution audio streams up to PCM 32bit 384kHz and DSD256.

LED Indicator

The volume knob of the FiiO K7 is surrounded by an attractive circular RGB LED indicator. In addition to giving the device an aesthetic touch, it also provides information about the sampling rate of the audio stream being played.

  • Bleu : 44.1kHz / 48kHz
  • Jaune : 88.2kHz / 96kHz / 176.4kHz / 192kHz / 352.8kHz / 384kHz
  • Vert : DSD64/12/256
FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

A clean and stable power supply

The power supply circuit of the FiiO K7 consists of several independent stages, each regulated by low-noise LDOs. Thus optimized, it provides a clean electrical signal to all the audio circuits of the amplifier.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Two gain levels

In addition to its high power and for even more versatility, the K7 offers two levels of gain, low and high, to adapt to the vast majority of headphones.

Elegant & Modern

The K7 is clad in a precision CNC machined aluminum chassis. It effectively protects the circuits and components of the device while giving it a sober but elegant and modern aesthetic.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Precise volume control

The front panel of the FiiO K7 features a large volume knob. Thanks to an ADC curve reconstruction, it is able to perform a precise volume control over 112 steps, without adding noise.

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
1Input selector
2Active input LED indicator
3Signal format LED indicator
4Volume / ON-OFF button
5Single-ended Jack 6.35mm headphone output
6Balanced Jack 4.4mm headphone output
7Stereo RCA line input
8Stereo RCA line output
9Coaxial input
10Optical Toslink input
11USB-B input
12Power supply

Technical characteristics

Specifications
Product typeHeadphone amplifier
Inputs1* USB-B
1* Stereo RCA line input
1* Optical Toslink
1* Coaxial (RCA)
Outputs1* Single-ended Jack 6.35mm headphone output
1* Balanced Jack 4.4mm headphone output
1* Stereo RCA line output
Amplification chips2* THA AAA-788+
DAC chips2* AKM AK4493S
USB interfaceXMOS XUF208
Volume controller2* NJU72315
Supported sampling ratesUSB: PCM up to 32bit 384kHz, Native DSD up to DSD256
Coaxial: PCM up to 24bit 192kHz
Optical: PCM up to 24bit 96kHz
Recommended headphone impedance16~300Ω
Line output performances
Frequency response20Hz~20kHz: ± <0.4dB (UAC)
20Hz~20kHz: ± <0.8dB (SPDIF input)
20Hz~50kHz: ± <2.2dB (UAC)
20Hz~50kHz: ± <1.7dB (SPDIF input)
Crosstalk≥ 102dB (1kHz, 10kΩ)
Noise floor< 3µV (dBA)
SNR≥ 116dB (dBA, UAC)
THD+N< 0.0005% (1kHz, 10kΩ, dBA)
Output level≥ 2Vrms
Single-ended headphone output performances
Output powerL+R ≥ 2*1220mW (32Ω, THD+N < 1%)
L+R ≥ 2*140mW (300Ω, THD+N < 1%)
Output impedance< 1Ω (32Ω)
Crosstalk≥ 77dB (1kHz, 32Ω)
Frequency response20Hz~20kHz: ± <0.3dB (UAC)
20Hz~20kHz: ± <0.7dB (SPDIF input)
20Hz~50kHz: ± <2.1dB (UAC)
20Hz~50kHz: ± <1.6dB (SPDIF input)
Noise floor< 3.1µV (dBA, AUX input)
< 4.4µV (dBA, UAC)
SNR≥ 128dB (dBA, AUX input)
≥ 120dB (dBA, UAC)
THD+N< 0.0003% (1kHz, 32Ω, dBA)
Peak output voltage≥ 18.9Vpp
Balanced headphone outputperformances
Output powerL+R ≥ 2*2000mW (32Ω, THD+N < 1%)
L+R ≥ 2*560mW (300Ω, THD+N < 1%)
Output impedance< 1Ω (32Ω)
Crosstalk≥ 124dB (1kHz, 32Ω)
Frequency response20Hz~20kHz: ± <0.3dB (UAC)
20Hz~20kHz: ± <0.7dB (SPDIF input)
20Hz~50kHz: ± <2.1dB (UAC)
20Hz~50kHz: ± <1.6dB (SPDIF input)
Noise floor< 5.1µV (dBA, AUX input)
< 7.7µV (dBA, UAC)
SNR≥ 128dB (dBA, AUX input)
≥ 120dB (dBA, UAC)
THD+N< 0.0003% (1kHz, 32Ω, dBA)
Peak output level≥ 37.7Vpp
General
Supply voltage12VDC 2A (power supply included)
Weight610g
ColorBlack
Package1* FiiO K7
1* Power supply
1* USB cable

Frequency response - Curve 1

Test conditions : USB input, -5dB sine signal, high gain, single-ended headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 2

Test conditions: USB input, -5dB sine signal, high gain, balanced headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 3

Test conditions: USB input, -6dB sine signal, high gain, 20Hz-50kHz, line output, 10kΩ

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 4

Test conditions: entrée coaxiale, -5dB sine signal, gain faible, single-ended headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 5

Test conditions: entrée coaxiale, -5dB sine signal, high gain, balanced headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 6

Test conditions: entrée coaxiale, -5dB sine signal, high gain, line output, 10kΩ

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 7

Test conditions: entrée optique, -5dB sine signal, high gain, single-ended headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 8

Test conditions: entrée optique, -5dB sine signal, high gain, balanced headphone output, 32Ω

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256

Frequency response - Curve 9

Test conditions: entrée optique, -6dB sine signal, high gain, line output, 10kΩ

Red curve: left channel / Blue curve: right channel

FiiO K7 Amplificateur casque symétrique 2*THX AAA-788+ 2*AK4493S XMOS XUF208 32bit 384kHz DSD256
 
Data sheet
InputRCA
InputOptical
InputUSB
InputSPDIF
OutputJack 6.35mm
OutputRCA
OutputJack 4.4mm
ColorBlack
ClassClass D / T
Remote ControlNo
 
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FIIO K7 DAC Balanced Headphone Amplifier 2x THX AAA-788+ 2x AK4493S XMOS XUF208 32bit 384kHz DSD256
With the K7, FiiO unveils a compact, high-performance headphone amplifier based on a high-quality technical design and high-end components. Within...

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