[Android Head-Units] Aaantonn:
I will explain why the majority of the radio does not play as well as the native radio played. The head unit is tuned to your acoustics, each acoustic is different in everything, like the interior of each car, and the manufacturer makes these settings initially. When you buy a new radio, absolutely any, at any cost, it is not tuned to your acoustics and your car, so it simply does not play, and all the proposed saved equalizers will play badly. In order for your radio to play beautifully and loudly, you need to adjust the equalizers. You need to skip the Sweep signal, 20-20000 Hz and you will hear that the sound is not uniform, then louder then quieter. The sound should go evenly and approximately in the same range. A professional will be able to adjust the Sweep signal by ear, but a simple person is unlikely. There is a way for the deaf to do this)

Believe me, installing equalizers is a huge increase in quality and volume! The volume is definitely enough for you, but you can make the quality even better only with the help of an amplifier, but this is a completely different topic. But I think there are those people who are satisfied with it, or everything coincided well and the music plays more or less normally.

I promised to tell you how to set up the radio.

1- download the SPECTRA PLUS program to the laptop, it is free for a month, and then see for yourself. Install the Frequency Sound Generator program on your phone. Program for android, for iPhone look for yourself.

Settings for SPECTRA PLUS on the first photo.

2 - download sweep signal the link below and run it in the SPECTRA PLUS program. We save the result at the maximum values. Now we see how the sound card works on a laptop, and we can consider this graph as ideal, we will stream to it.

3 - we go into the equalizer on the radio, set the filter from 60 hertz as in the second photo. We go into the equalizer mode and turn on the user settings. We download sweep signal to the flute or to the radio tape recorder. We turn on the radio volume to 15, turn on the graph recording in SPECTRA PLUS on the laptop and start sweep signal. We need to take the chart off the radio. Now we see all deviations from the schedule.

4 - we start playing with the equalizer settings, where we need to raise, where we need to lower. All values in hertz coincide with the equalizers on the radio. Please note that if we raise or lower one scale, then with it the wave and neighboring scales should smoothly rise or fall.

We adjusted the equalizers, then launched sweep signal again and took readings in SPECTRA PLUS. See what happened and move on.

If it’s hard for you to find the scale that needs to be adjusted, turn on the Frequency Sound Generator program, start the sound through the bluetooth on the radio and start looking for what scale we need, I did it in order to have a general concept.

I spent an hour setting it up and you can see what I got in the third photo. Then we make fine adjustments as we like.

There is also such an item in the setting as to select any frequency and amplify it, usually it is low frequencies, I selected 87 hertz and set the values to 9, this gives a good bass. Play around with these settings depending on the style of the music. 4th photo.

There is another important setting like delay. You are not sitting in the center of the car and the sound does not reach you evenly, here you can adjust all this. But I don’t use this setting, because I set up the radio not only for myself, but also for the passenger. This topic is well open on YouTube, search.

The main problem is that I cannot save user settings, either it is not possible in this firmware, or I have not found how. You may accidentally press the default button and all settings will be lost. If you know how to save settings or download them, write! At the end of the photo is what I got on the equalizers. Sound after tuning heaven and earth. Perhaps you have super hearing and can do all this without programs, but I could not.

Sweep Signal - Google Drive

drive.google.com