Fosi Audio P1, Руководство пользователя, Страница: 8 / 12

4: Why do loudspeakers make a lot of electric noise?
• If you are not using the original factory standard power supply,
please replace the power supply before testing. Many power
supplies in the market have a large interference coefficient, which
will cause a lot of current sounds.
• Because the electronic tube is vulnerable to electromagnetic
interference, make sure there are no sockets, computers, radios,
and other strong magnetic products around the electronic tube.
• If the above is normal, please shut down P1 and plug in and out
the electronic tube again to ensure that all electronic tubes are
fully connected to P1. In addition, please replace the sound
source and wire and test again to confirm whether the problem is
caused by the sound source or P1.
5: Why the speaker has a drone when I just plug in the
input cable but don’t connect the sound sources?
• If you use unshielded signal lines, there will be interference
signals entering the power amplifier. If you hate the sound, you
are advised to use the shielded signal lines or unplug the signal
lines.
6: Why the sound is very hard at the beginning, the 3
frequencies are not very clear, but normally after a day of
use?
• The tube is a very sensitive device with good effect once the
temperature should reach a degree commonly, normally about
half an hour later the voice is very natural.
Troubleshooting/QA
1: Cables are connected, but no sound output?
• Check the POWER indicator is on, press the POWER button if the
light is still off, At this point, you can find the same output voltage
power supply (must 12V) to check if the machine or power supply
failure. If the POWER indicator light is on, check whether the
corresponding input signal is selected correctly.
• If the indicator light is on, check whether the VOL knob is in the
minimum position. If so, turn clockwise to normal Volume.
• Check whether the two vacuum tubes are fully inserted into the
jack.
• If both of the above are normal, check the input device if it is
paused, mute, or the volume is minimized.
Note: Make sure that all the cables are completely pushed into the
device.
2: Why does the sound is cracking?
• This product is for the tube preamp but also can be used as a
preamp, If post equipment is maxed volume & preamp too, it's
easy to distort, you just need to turn down the volume of the
equipment, then ok.
3: Why does the volume of the machine stay the same,
while the sound of different audio sources (such as CDS
and mobile phones) is different?
• The output range of different types of audio source devices is
different, the mobile phone is usually 0.35mV, and the CD is
1V.The signal output amplitude of the sound source will directly
influence the volume.