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FOSI AUDIO K7 DAC Headphones Amplifier
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Fosi Audio K7 DAC Headphone Amplifier AK4493SEQ XMOS XU208 Bluetooth 5.0 aptX HD 32bit 384kHz DSD256
The Fosi Audio K7 is a compact, high-performance DAC/headphone amplifier featuring an original design and high-quality components. It features an XMOS XU208 USB interface, an AKM AK4493SEQ DAC chip for its digital-to-analog conversion stage, and a balanced amplifier circuit with two TPA6120 chips and OPA1612 OPAs. The Fosi Audio K7 is therefore capable of supporting high-resolution audio streams up to PCM 32bit 384kHz and DSD256, and delivers headphone output power of up to 2x 2100mW at 32Ω. The K7's Bluetooth 5.0 connectivity - thanks to a Qualcomm QCC3031 chip - supports standard SBC and AAC codecs as well as the high-resolution aptX, aptX LL and aptX HD codecs, and thus offers a quality wireless listening experience. In terms of connectivity, the K7 is equally complete and versatile, with three digital inputs (USB-C, coaxial and Toslink optical), two headphone outputs (single-ended 3.5mm jack and balanced 4.4mm jack), as well as a 3.5mm jack microphone input and an RCA line output. Finally, a 1.5” LCD screen displays operating information for intuitive operation.
Fosi Audio K7: An audiophile DAC for a high-resolution listening experience
Thanks to its USB XMOS XU208 interface and AKM AK4493SEQ DAC chip, the Fosi Audio K7 supports high-resolution audio streams up to PCM 32bit 384kHz and DSD256 via its USB-C input. The Toslink optical and SPDIF coaxial inputs support PCM up to 24bit 192kHz. The K7 offers an audiophile listening experience with faithful reproduction of detail.
Fosi Audio K7: Balanced amplification circuit for exceptional power and sound clarity
The K7's headphone amplifier circuit, based on a balanced architecture, integrates two TI TPA6120 chips and two AOP OPA1612s. This configuration delivers high headphone output power (2x 2100mW into 32Ω on the balanced 4.4mm jack output and 2x 600mW into 32Ω on the unbalanced 3.5mm jack output), enabling a wide range of headphones and earphones to be driven with exceptional sonic clarity.
Fosi Audio K7: Bluetooth 5.0 for high-quality wireless connectivity
The Fosi Audio K7 is equipped with a Qualcomm QCC3031 receiver chip, offering stable Bluetooth 5.0 connectivity and support for standard SBC and AAC codecs, as well as high-definition aptX, aptX LL and aptX HD codecs for quality wireless transmission.
Fosi Audio K7: A clean power supply for optimum sound reproduction
The Fosi Audio K7's power supply is optimized through the use of LDO regulators, ensuring precise voltage distribution for each component. This design reduces noise and improves overall sound quality.
Fosi Audio K7 overview
| 1 | Volume / Gain control |
| 2 | LCD screen |
| 3 | Tonalité / Microphone volume control |
| 4 | Control buttons |
| 5 | Microphone jack 3.5mm input |
| 6 | Single-ended jack 3.5mm headphone output |
| 7 | Balanced jack 4.4mm headphone output |
| 8 | RCA line output |
| 9 | Bluetooth antenna |
| 10 | Coaxial input |
| 11 | Optical Toslink input |
| 12 | USB-C input |
| 13 | Jack DC 12V power input |
Technical characteristics
| Specifications | |
|---|---|
| Product type | DAC Headphone amplifier |
| USB interface | XMOS XU208 |
| DAC chip | AKM AK4493SEQ |
| Amplification chips | 2x TPA6120 |
| Bluetooth chip | QCC3031 |
| Inputs | 1x USB-C 1x Optical Toslink 1x Coaxial 1x Microphone jack 3.5mm input Bluetooth 5.0 |
| Outputs | 1x Stereo RCA line output 1x Balanced jack 4.4mm headphone output 1x Single-ended jack 3.5mm headphone output |
| Supported sampling rates | USB: PCM up to 32bit 384kHz, DSD up to DSD256 Optical Toslink / Coaxial: PCM up to 24bit 192kHz Bluetooth 5.0: PCM up to 24bit 48kHz (depending on codec used) |
| Supported Bluetooth codecs | SBC, AAC, aptX, aptX LL, aptX HD |
| Bluetooth range | ≤ 13m |
| Recommended headphone impedance | 16-300Ω |
| OS compatibility | Windows 7, 8, 8.1, 10, 11 (with driver) Mac OS X, Linux (without driver) |
| Balanced jack 4.4mm headphone output | |
|---|---|
| Output power | L+R ≥ 2x 2100mW (32Ω/THD+N<1%) |
| SNR | 121dB |
| THD+N | < 0.0002% |
| Dynamic range | 121dB |
| Noise level | ≤ 6.5μV |
| Single-ended jack 3.5mm headphone output | |
|---|---|
| Output power | L+ R ≥ 2x 600mW (32Ω/THD+N<1%) |
| SNR | 122dB |
| THD+N | < 0.0005% |
| Dynamic range | 121dB |
| Noise level | ≤ 2.5μV |
| Frequency response | 20Hz-20kHz (±0.1dB) |
| RCA line output | |
|---|---|
| Output level | ≥ 2Vrms |
| SNR | 20Hz-20kHz (±0.1dB) |
| THD+N | 0.0005% |
| Dynamic range | 121dB |
| Noise level | ≤ 3μV |
| Frequency response | 20Hz-20kHz |
| General | |
|---|---|
| Power supply | 12V DC 2A |
| Dimensions | 9 x 15.5 x 4.3cm |
| Color | Black |
| Package | 1x Fosi Audio K7 1x USB-A/C to USB-C cable 1x Jack 3.5mm splitter 1x Bluetooth antenna 1x Power adapter |
| Input | SPDIF |
| Input | Bluetooth |
| Input | USB |
| Input | Optical |
| Output | RCA |
| Output | Jack 4.4mm |
| Output | Jack 3.5mm |
| DAC / ADC Chip | AK4493SEQ |
| Max sampling rate | 384kHz |
| Max sampling rate | DSD256 |
| Color | Black |
| Class | Class A / AB |
| Networking | No |
| Remote Control | No |
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