<b>P20 is Loxjie's first full balance tube amplifier headphone power amplifier!It use the military grade 6N3 tube,Plus the well-designed and calibrated amplifier circuit! Let the amplifier have lower distortion under the premise of ensuring"Tube Style"!And the P20 also has true balanced inputs and outputs!This can maximize the performance of the headphones! </b><br><b>Specification</b> <br><b>Output Power Unbalanced headphones </b><br>32Ω: 385mW <br>64Ω: 210mW <br>150Ω: 105mW <br>300Ω: 55mW <br>600Ω: 29mW<br> <b>Balanced headphones</b><br> 32Ω: 425mW <br>64Ω: 665mW <br>150Ω: 565mW <br>300Ω: 325mW <br>600Ω: 175mW <br>THD+N: 0.02% <br>THD+N: 0.006% <br>SNR: 97dB <br>SNR: 102dB <br>Power Consumption: 10W Standby power: 0.5W <br>Size: 148x70x128(WxHxD) <br>Weight: 600g<br> If you meet any problem about LOXJIE series products,please feel free and contact us.<br>We will make more improvements to be perfect!<br> **If you receive an item with the wrong color, please contact us immediately and we will process and resend a brand new product for free. We are in contact with the Amazon team and they will help us investigate and remove the wrong inventory of goods. This error will not happen again in the future, please rest assured. **Warm up for 30 minutes to get better effect Plugged in the item with the included power supply and gave the tubes time to warm up.After 30 minutes, just plugged in your headphones and perfect sound was coming out of the amp.