Most Tube amplifier users are troubled by the background noise, we tried various test to avoid this problem.
After testing various kinds of vacuum tube, we found that Soviet OTK 6H165B mini vacuum tube can meet ours requirement.
This tube in tiny size but has great performance, it delivers a pure, warm, natural and transparent sound.
Coordinating with the fine customized circuit, DF-M1 can perfectly prevent the annoying noise may heard in many other lower quality products.
DF-M1 can match your smart phone, laptop, desktop DAC, tablet, music player or other audio devices.
It can also power high-performance headphones including the HD580, HD600, HD650, K701, K702, DT880, T70, T90, SR60e, SR80e, M1, SR225, SR325, RS1e, and so on.
For this device, its tube is soldered on the board and unreplaceable.
Please turn on the amplifier for about 30 seconds before you connect the audio source and the headset.
We recommend using 16~300Ω headphones, please mind volume level when using the armature earphones and headphones that have low impedance and high sensitivity.
For noise issue, please keep it away from devices like routers or mobile phones that may interferes in the audio signal.
If no interference, please remove all input and listen to see if the noise still exists. If so, the device may be defective and you can contact us to get support.
Do not touch the tube by your bare hand while the device working, the tube may be in a very high temperature.
Please turn the volume rotary knob to the minimum level before power on the device, to keep your headphone safe and avoid the power impact accident.
|Output power||≥500mw (@32ohm)|
|Adapter Headphone Impedance||16 - 300ohm|
|Total harmonic distortion|| <0.005%
SNR: ≥110 dB
|Frequency Response||20 Hz - 40 kHz|
|Input and Output Audio Jacks||3.5mm|
|Input voltage||6V 2A|