See Overview, Technical Data and Comparison below.
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 |