Douk Audio Tube Headphone Amp: for XLR, 4.4mm, 6.35mm HiFi Headphones, Stereo Preamplifier for Amplifiers, Speakers, Home Deskto

Warm tips 1. Due to scarcity, the two square Wima capacitors are used parts taken from previous devices. 2. The working voltage of E2 is DC 15V (=3A), below or over this will cause bad performance or damage. 3. The three headphone jacks cannot output simultaneously. Please select one jack for use. 4. Stereo RCA output and headphone output can work at the same time, and the volume/gain of the two outputs are controlled simultaneously. 5. E2 adopts 1PC NE5532 and 1PC 49720 op-amps. Only the 49720 op-amp is pluggable and supports replacement by dual op-amps like 2604 / 2134 / muses02 etc. Parameters 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: 16-600O 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 Packing list 1* E2 Headphone Amplifier 2* ECF801 Tubes 1* DC 15V Power Adapter 1* 6.35mm to 3.5mm Adapter 1* User Manual