Parameters:
Chip Architecture: CM6642+QCC3008+NE5532+classic 47
PC-USB Input Sampling Frequency: 192K/24Bit
THD: 0.01%
PC-USB System supported: XP/W7/W8/W10/MAC/Linux
Bluetooth VER: 5.0
Headphone matching impedance: 32-300Ω
SNR: 103dB
Headphone Max power output: 160mW 32Ω load
Working voltage: DC12V
Bass & Treble Range: ±6dB
Product Dimension: 180*118*36mm
RCA output level: 2.3V
Product Weight: 0.47kg
Frequency Range: 20Hz-20kHz(±3dB)
Package Dimension: 240*210*60mm

Packing List:
1*P1 Preamp
2*6J5 Tube
1*Power Supply
1*USB Cable
1*Bluetooth Antenna
1*ManualDouk Audio P1 Preamp has been acclaimed by countless audiophiles worldwide, now we upgrade 6J5 to JAN5654 / GE5654 tubes according to many audiophiles' response, the sound quality will be greatly improved.
With 3 kinds of audio input(Bluetooth/USB/RCA) and 2 kinds of output(RCA/3.5mm headphone), P1 can be used as HiFi tube Preamp, USB DAC or headphone amp with HiFi clear, warm, dynamic, sweet tube sound, bringing extremely high-quality listening experience.
Bluetooth 5.0 (QCC3034) supporting APTX-HD lossless transmission. PC-USB (CM6642) supporting 24bit 192KHz and compatible with Windows/Mac/Linux system, matching well with many audio devices such as iPod, Phone, MP3 players, TV, Blu-ray players, Echo Dot, CD players, etc.
Adopting NE5532 op amp+classic 47 headphone amp architecture which can drive 32-300 ohms headphones, and a bypass switch is specially designed to turn on/off the tone control, more convenient to enjoy original sound or obtain more delicate sound with treble and bass control knob, adding much fun and higher playability.
Exquisite appearance with proper size, blue and orange light decorating vacuum tube, makes it fashionable and attractive, bringing wonderful auditory and visual enjoyment, very suitable for home and desktop audio system.