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The E17 USB DAC Headphone Amplifier is a compact device that improves the sound quality on just about any device. The amplifier has a mini USB interface which allows you to connect a computer to provide audio decoding out of any computer.
Standard 3.5mm line and S/PDIF inputs let you connect analog line and digital PCM sound sources, such as MP3 players, smartphones, tablets, and more.
Using a mini USB, the E17 lets you connect the Amp to a computer for digital audio decoding. The Amp has gain, balance, and tone controls to adjust the device for your specific tastes.
With such a compact size, the E17 does not compromise offering up to 15 hours of operation time and recharges in just 3.5 hours.
| Model /Number: | ALPEN2/ E17K |
| Weight: | 110 g |
| Dimensions: | 104.1 x 62.2 x 12.8 (mm) |
| Battery Capacity: | >1500 mAh |
| Battery Life: | >15hours |
| Charging Time: | <220 mins |
| Audio Input: | MicroUSB, COAXIAL, OPTICAL 3.5mm jack |
| Volume Control: | Digital Volume Control (0-60) |
| Drive Ability: | 16~150Ω |
| Output Power: | > 220mW@32 Ω/>290 mW@16 Ω |
| THD: | <0.003%@1KHz |
| Frequency Response: | 10Hz~500KHz@32 Ω |
| Input Sensitivity: | 0/6/12dB=2.25V/1.125V/565mV |
| Crosstalk: | >75 dB@1KHz |
| Gain: | 0/6/12dB |
| MAX Output Voltage: | >7.8 Vp-p |
| Colour Available: | Black |
| Headphone Output: | 3.5 mm stereo jack |
| Bass boost: | Yes |
| Power input: | USB 5V/500mA |
| Output Impedance: | <0.3 Ω |
| Signal to Noise Ratio: | > 110 dB (AUX IN) |
| Max Input Level: | > 4 Vrms |
| Channel Imbalance: | <0.5 dB |
| Bass Boost Range: | -10dB~+10dB |
| Max Output Current: | >80 mA |
Frequency Response diagram of curves
Test condition:
Aux Input: 200 mV, TREBLE=OFF, BASS=ON
Red curve: Left channel; Blue curve: Right channel; Magenta curve: Left channel
Frequency Response diagram of curves
Test condition:
Aux Input: 200 mV, TREBLE=ON, BASS=OFF
Red curve: Left channel; Blue curve: Right channel; Blue curve: Left channel
Distortion diagram of curves
Test condition:
Input: 200mV, Load: 32 Ω
Red curve: Left channel; Blue curve: Right channel
| 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 | ||