HIFI enthusiast preamplifier preamplifier tone board 2-channel source processing

Description

The board color may be
different b
ecause of different parts supplier,but they are with same function and quality.We will send you blue or green board randomly.
Power supply range: double 9-15 volts (AC) recommended to use our dual 12V with shield power supply
Number of processing channels: two-channel input and output
Input and output interface: standard RCA (2 pairs)
Maximum output voltage after processing: 5 volts
Parametric equalizer frequency: 150hz, 500hz, 2khz, 15khz bass equalizer frequency adjustable: 45-120hz
Equalizer amplitude: +/-12db
Bass frequency: 40-100hz
Input impedance: 15k ohms
Signal to noise ratio: 90db
Total harmonic distortion: 0.05%
Channel separation: 70db
Frequency response: 10hz-50hz, -3db
5-band frequency equalization adjustment
Subwoofer... bass... midrange... vocals... treble
With volume control
Let you enjoy all kinds of sound effects as you like!
The installation location is after the low level of the host output (mobile phone tablet MP3 CD DVD), the tone is connected with the RCA audio cable, and the signal is input to it. Then connect the tone from the tone to the amplifier via the RCA audio cable.
That is to say, if he does not accept the amplifier, it cannot be used. Only in the case of receiving the amplifier, the addition can be used to play the tone.
But its practical role is not only the tuning effect, but also a lot of practical and convenient uses:
1. After working with the power amplifier, there is a clear effect of enhancing the bass.
Such as computer, MP3, mobile phone, CD, DVD player, etc. ...... Generally, the output of the original host's audio signal is 0.8 to 1.2 volts, and the audio signal coming out through this tone is 5 volts. Everyone knows why the sound quality of the main unit is not good? Because the output signal voltage is small, the voltage of the bass signal is the strongest in the music signal, so the original host output of 0.8 to 1.2 volts simply does not produce a good bass.
2. When the volume is very light, the music signal is clear and the strength is sufficient. (The reason is the same as above because the output signal is 5 volts.)
3. It is suitable for listening to music downloaded from MP3 online. It can make up for the lack of sound quality in the download music car.
warn:
Tone adjustment of the tone board, under normal conditions, all potentiometers are turned off first, then the potentiometers are slowly turned to the midpoint one by one. What is the midpoint is the meaning of the potentiometer being halfway open. If you feel that the sound is not enough, then you can adjust which potentiometer to adjust it.
There may be some people who want to adjust to the midpoint. Explain that because the original sound source is usually 3db, the potentiometer is at the 3db position at the midpoint, and the total balance of the potentiometer is +/-12db.
At the same time, if you want to listen to friends with high treble, you should adjust the bass part to a lower level. You can have a higher pitch and a little more. There are some friends who often have inertia problems that they would like to listen to. But it doesn't feel enough, why isn't it enough? Because the bass is turned up and then the tweeter is adjusted, so the bass has overshadowed the treble. At this time, you only need to adjust it according to the "midpoint position" mentioned above.
Some friends who are not very useful will adjust all potentiometers to the maximum, that is not acceptable, because there are not a few amplifiers that can be accepted, all frequencies are distorted at the highest, why are distortions? Here, the following explanation, the original sound source is generally in 3db, and our tuning board is in the balance range: +/-12db, so it will be distorted, we also tried, when the frequency modulation is strengthened to the maximum It is not distorted, but after two or more of them are added to the highest, there will be distortion, so don't adjust everything to the maximum, it will be counterproductive.
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