Ariel JhonnyD I even notice a lack of linearity in Dudu7. As the volume is increased, the treble is lost. The TDA 7851L that comes with the S160 does not have that problem. From low volume to maximum there are no changes in the sound profile. That's why the specifications of the TDA 7851L say HiFi class. On the other hand, the TDA 7803 does not say that it is HiFi class. It only says that it is highly energy efficient. But who cares about energy efficiency if sound quality is lost?????.
JhonnyD Ariel I can make the music as loud as i want without loosing bass or treble. It is so loud, that it hurts, when i want. Maybe you have a faulty device? Or there is no thermal paste on the audio chip and it's getting to hot?
Ariel JhonnyD If I specifically touch the area of ββthe chip it gets very hot (where the duduauto inscription is). So I assume that the heat transmission from the chip to the aluminum case is good. What I'm not sure about is if that operating temperature is normal. Considering that the tda 7803 is a high efficiency amplifier, it should not generate as much heat. You also have to keep in mind that saying that something sounds good is subjective and maybe something sounds good to you that sounds bad to me. And I am also being objective. I am comparing an s160 device that objectively seems better than dudu7. And I also base it on the specifications of both chips. TDA7851L achieved a HiFi rating, and the TDA7803 did not.
Ariel JhonnyD It seems that he discovered the secret to making it sound good. In the equalizer, I assigned the first frequency of 20 Hz a Q Factor of 8 and the last frequency of 20 Mhz I gave it a Q factor of 0.7. And assign progressive values ββin the rest of the intermediate bands. That way the sound is no longer artificial. Undoubtedly, properly assigning the Q Factor is very decisive so that there is no overlap between the different bands of the equalizer.
Ariel JhonnyD Hi. I have discovered a problem. As I mentioned below, my unit came with a 7808 TDA chip. It is not a 7803. The problem with the 7808 is that it only supports 4 ohm speakers. And in my car I have a speaker system with less than 4 ohms. That's why the chip must be heating up too much and I don't have good sound quality. I am making a complaint to the seller because at the time of purchase the specifications published about the product only talked about TDA 7803. I never saw photos or information that say it could have 7808.
ciubaka madusaya theres a soundmaster app which allow to share the settings without need of copying them
Ariel JhonnyD Also check the thermal paste on the amplifier. It is a tda 7808. It is not a 7803. For my taste it had too much thermal paste. Lots of space between the chip and the aluminum case. As a supplement, I placed a thin sheet of copper in front of the chip so that it fits tighter and the thermal paste is only a thin film.
Ariel JhonnyD While there was an improvement in sound, I can't achieve the same sound quality as the S160. It seems that the Dudu7's equalizer lacks more range and precision in the band controls. +10 and -10 is not enough.