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FIIO K7 DAC Balanced Headphone Amplifier 2x THX AAA-788+ 2x AK4493S XMOS XUF208 32bit 384kHz DSD256
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FiiO K7
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.
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.
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.
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
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.
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.
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.
| 1 | Input selector |
| 2 | Active input LED indicator |
| 3 | Signal format LED indicator |
| 4 | Volume / ON-OFF button |
| 5 | Single-ended Jack 6.35mm headphone output |
| 6 | Balanced Jack 4.4mm headphone output |
| 7 | Stereo RCA line input |
| 8 | Stereo RCA line output |
| 9 | Coaxial input |
| 10 | Optical Toslink input |
| 11 | USB-B input |
| 12 | Power supply |
Technical characteristics
| Specifications | |
|---|---|
| Product type | Headphone amplifier |
| Inputs | 1* USB-B 1* Stereo RCA line input 1* Optical Toslink 1* Coaxial (RCA) |
| Outputs | 1* Single-ended Jack 6.35mm headphone output 1* Balanced Jack 4.4mm headphone output 1* Stereo RCA line output |
| Amplification chips | 2* THA AAA-788+ |
| DAC chips | 2* AKM AK4493S |
| USB interface | XMOS XUF208 |
| Volume controller | 2* NJU72315 |
| Supported sampling rates | USB: PCM up to 32bit 384kHz, Native DSD up to DSD256 Coaxial: PCM up to 24bit 192kHz Optical: PCM up to 24bit 96kHz |
| Recommended headphone impedance | 16~300Ω |
| Line output performances | |
|---|---|
| Frequency response | 20Hz~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 power | L+R ≥ 2*1220mW (32Ω, THD+N < 1%) L+R ≥ 2*140mW (300Ω, THD+N < 1%) |
| Output impedance | < 1Ω (32Ω) |
| Crosstalk | ≥ 77dB (1kHz, 32Ω) |
| Frequency response | 20Hz~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 power | L+R ≥ 2*2000mW (32Ω, THD+N < 1%) L+R ≥ 2*560mW (300Ω, THD+N < 1%) |
| Output impedance | < 1Ω (32Ω) |
| Crosstalk | ≥ 124dB (1kHz, 32Ω) |
| Frequency response | 20Hz~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 voltage | 12VDC 2A (power supply included) |
| Weight | 610g |
| Color | Black |
| Package | 1* 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
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
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
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
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
Frequency response - Curve 6
Test conditions: entrée coaxiale, -5dB sine signal, high gain, line output, 10kΩ
Red curve: left channel / Blue curve: right channel
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
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
Frequency response - Curve 9
Test conditions: entrée optique, -6dB sine signal, high gain, line output, 10kΩ
Red curve: left channel / Blue curve: right channel
| Input | USB |
| Input | SPDIF |
| Input | RCA |
| Input | Optical |
| Output | RCA |
| Output | Jack 4.4mm |
| Output | Jack 6.35mm |
| Color | Black |
| Class | Class D / T |
| Remote Control | No |
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