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The thumb-sized K1 from FiiO is a portable headphone amplifier and DAC with mastering quality sound that supports resolutions of up to 24-bit/ 96 kHz. The unit offers true plug-and-play operation with no batteries needed and no drivers necessary for operation. The K1's audio architecture utilizes Savitechs's SA9023A USB receiver to decode USB audio, while the high fidelity, low noise TI PCM5102 DAC chip outputs to the TPA 61332A headphone amplifier, which is capable of driving most headphones with a range of 16 to 100 ohms. The K1 also self-mutes when powering on or off, reducing harmful transients. The all-metal chassis is sandblasted for optimal sheen, texture, durability of appearance, and handgrip. The K1 ships with a removable clip and a micro-USB connection cable.
| Weight: | 11.3g |
| Dimensions: | 50 x 0.8 x 0.3 (mm) |
| Battery Capacity: | N/A |
| Battery Life: | N/A |
| Charging Time: | N/A |
| Audio Input: | Micro USB |
| Volume Control: | N/A |
| Drive Ability: | 16 to 100 ohms |
| Output Amplitude: | > 75 mW |
| THD: | <0.01 |
| Frequency Response: | 20 Hz~20 kHz |
| Input Sensitivity: | >0 dB |
| Crosstalk: | > 70dB |
| GAIN: | 1.2dB |
| MAX Output Voltage: | 3.25 Vp-p |
| Colour Available: | Titanium |
| Headphone Output: | 3.5 mm stereo jack |
| Sample Rate: | Max 96kHz/24bit supported |
| Power Input: | USB 5V/500mA |
| Output Impedance: | < 1 |
| Signal to Noise Ratio: | > 100 dB |
| MAX input level: | N/A |
| Channel Imbalance: | < 0.3dB |
| MAX output current: | 35.93mA |
| Bass Boost Range: | N/A |
Frequency Response diagram of curves
Distortion Diagram of curves
| Model Name | Q1 | K1 | E10K | ALPEN 2-E17K | ||
| General Specifications | ||||||
| Color Available | Black | Titanium | Black | Black | ||
| Dimensions | 97 x 56 x 13.1 (mm) | 50 x 0.8 x 0.3 (mm) | 49.1 mm×80 mm×21 mm | 104.1 x 62.2 x 12.8 (mm) | ||
| Weight | 100 g | 11.3 g | 78 g | 110 g | ||
| Analog Audio input | Micro USB | Micro USB | Micro USB | 3.5 mm stereo Jack | ||
| Digital Audio input | N/A | N/A | N/A | Micro USB/Coaxial/3.5 mm jack（COAXIAL adapter attached） | ||
| Headphone output | 3.5 mm Stereo Jack | 3.5 mm Stereo Jack | 3.5 mm Stereo Jack | 3.5 mm Stereo Jack | ||
| Line Output | 3.5 mm Stereo Jack | N/A | 3.5 mm Stereo Jack | Dock(Micro USB)/3.5 mm Line Out port | ||
| Headphone Impedance Range | 16~150 Ω | 16 to 100 Ω | 16~150 Ω | 16~150 Ω | ||
| Volume Control | TOCOS Potentiometer | N/A | ALPS Potentiometer | Digital Volume Control (0-60) | ||
| Bass Adjust | 0/5 dB | N/A | YES | YES | ||
| Treble Adjust | N/A | N/A | N/A | YES | ||
| Balance Adjust | N/A | N/A | N/A | 5 dB | ||
| GAIN Control | -7dB/4.5dB (AUX IN) -3.5dB/8dB (USB IN) | N/A | N/A | 0/6/12dB | ||
| Line Out Bypass | YES | N/A | N/A | YES | ||
| Audio Performance (DAC Section) | ||||||
| USB Sample Rate Support | 32/44.1/48/96 kHz (16/24 bit) | Max 96kHz/24bit supported | N/A | 32/44.1/48/96 kHz (16/32 bit) DSD 2.8 MHz Supported | ||
| SPDIF Sample Rate Support | N/A | N/A | N/A | 32/44.1/48/96/192 kHz (16/24 bit) | ||
| THD+N | ＜0.0045% (10 kΩ/1 kHz) (LO) | ＜0.01% (1 kHz) | ＜0.006% (1 kHz) | ＜0.003% (1 kHz) | ||
| SNR | ≥107dB | ≥100dB | ＞105 dB | ＞110 dB | ||
| Dynamic Range | ＞95 dB | N/A | N/A | ＞102 dB | ||
| Line Out Level | ＞1.48 Vrms | N/A | N/A | ＞1.5 Vrms | ||
| Output Power1 | ＞190 mW (32 Ω/THD+N＜1%) | >75 mW（16Ω/THD+N＜1%) | 200 mW (32 Ω/THD+N＜1%) | > 220 mW (32 Ω) | ||
| Output Power2 | ＞75 mW (150 Ω/THD+N＜1%) | >35 mW（32Ω/THD+N＜1%) | N/A | >290 mW (16 Ω) | ||
| Frequency Response | 20 Hz~20 kHz | 20 Hz~20 kHz | 20 Hz~20 kHz | 20 Hz~20 kHz | ||
| Output impedance | ＜0.3 Ω | ≤ 1 Ω | ＜1.04 Ω | <0.3 Ω | ||
| Crosstalk | ≥75dB (1 kHz) | ≥70 dB (1 kHz) | ≥70 dB (1 kHz) | ＞75 dB (1 kHz) | ||
| MAX Gain | N/A | 1.2 dB | 1.6 dB (GAIN=L) 8.8 dB (GAIN=H) | ＞12 dB | ||
| Peak Output Voltage | 7.2 Vp-p | 3.25 Vp-p | 7.39 Vp-p | ＞7.8 Vp-p | ||
| MAX output Current | ＞75 mA | 35.93 mA | 81.6 mA | ＞115 mA | ||
| Input Overload | 4.3 Vrms | N/A | N/A | 4 Vrms | ||
| Power and Battery | ||||||
| Power/Charger | Recommend DC5V 1A | USB on PC | recommend DC5V 500mA | Recommended DC5V 1A | ||
| Charging Display | YES | N/A | N/A | YES | ||
| Battery Level display | N/A | N/A | N/A | YES | ||
| Capacity | 1400 mAh | N/A | N/A | 1500 mAh | ||
| Charge Time | ＞30 h | N/A | N/A | ＞15 h | ||
| Battery Life | ≤4 h | N/A | N/A | ≤ 220 min | ||