• Douk’s E2 Headphone Amp Sounds wonderful. It uses Mil-Spec Valvo ECF801 Tubes——Reviewed by @Old Guy Hifi

• Powerful Output and Wide Compatibility: The E2 delivers a powerful output of up to 2000mW, powered by two TPA6120 chips, capable of driving headphones of 16Ω to 600Ω. It supports XLR/4.4mm/6.35mm jack, including an equipped 6.35mm to 3.5mm adapter, compatible with the vast majority of headphones.
• High-Performance Preamp: E2 is also a powerful preamp with dual RCA inputs and intuitive switches, allowing you to effortlessly switch between audio sources. Whether you want to use it as a headphone amplifier or a pre-amplifier, or even both at the same time, the E2 ensures an ultra-flexible and dynamic listening experience.
• Luxury ECF801 Tube for Unmatched Sound: The E2 is equipped with German Valvo ECF801 tube, renowned for its rare availability and exceptional quality. Operating at a high internal voltage up to 175V, the military-grade tube delivers immersive audio, capturing the essence of classic tube sound.
• Timeless Retro VU Meter and Wood Design: The vintage-style vacuum tubes, VU meter and walnut wood panels, mounted on the exterior of the aluminum casing, seamlessly blend natural beauty with industrial elegance. A stunning piece that enhances any space, from home audio setups to professional studios.
• Customizable Op-amp and High-End Components: The E2 adopts LME49720 op-amp, giving you the flexibility to swap and tailor the sound to your preferences, along with premium components like Japanese ALPS potentiometer and German WIMA capacitors, ensuring superior sound quality and performance.

• Brand: Douk Audio
• Model: E2
• Audio input: 2 groups of stereo RCA
• Audio output: Stereo RCA/4-pin XLR&4.4mm&6.35mm headphone jack
• Frequency response: 20Hz-20kHz (±0.5dB)
• THD+N: 0.02%
• SNR: ≥110dB
• Matched headphone impedance: 16-600Ω
• Headphone output power: Low gain(L): 0.55W High gain(H): 2W
• RCA output level: Low gain(L): 4.3V High gain(H): 8.4V
• Input sensitivity: 2V
• Working voltage: DC 15V/≥3A
• Dimensions (W*D*H): 95*92*50mm / 3.74*3.62*1.97in
• Package dimensions (W*D*H): 280*230*110mm / 11.02*9.05*4.33in
• Net weight: 1.17kg / 2.58lb
• Package weight: 1.6kg / 3.53lb

User Manual of Douk Audio E2

Warm tips：

• Due to scarcity, the two square Wima capacitors are used parts taken from previous devices.
• The working voltage of E2 is DC 15V(≥3A), below or over this will cause bad performance or damage. 
• The three headphone jacks cannot output simultaneously. Please select one jack for use.
• Stereo RCA output and headphone output can work at the same time, and the volume/gain of the two outputs are controlled simultaneously.
• E2 adopts 1PC NE5532 and 1PC 49720 op-amps. Only 49720 op-amp is pluggable and supports to be replaced by dual op-amps like 2604/2134/muses02 etc.