When the volume is turned up, the sound from the speakers becomes sandy. This is the speaker can not fully absorb the frequency issued by the amplifier and the flat amplitude vibration caused by the distortion. There is no such thing as a mismatch between the power of the amplifier and the speaker in audio acoustics, only how you can tune it to the best state.
You can divide the current set of audio into four parts, host, amplifier, la la group, wire,
Wire can not be too provincial, la la line as thick as possible, the audio line must be used to genuine fully shielded line, because the car after the start of the car's electrical appliances will affect the sound source, which is very important.
Any host, amplifier and bla have a volume of the maximum distortion value, there is no set of stereo open to the maximum without distortion, and you now need to find out the volume of the maximum distortion value,
Debugging method.
Plug in all the audio cables, measure all the positive and negative lines of the LaBa connected to the amplifier corresponding to the positive and negative LaBa group output ports, the amplifier all the audio size control and tone adjustment to the mid-point of the host tone adjustment to the mid-point of the host to adjust slowly adjust the volume, to the music distortion, note down the location of the host volume after the turn back to the half, and then slowly adjust the amplifier all the channel volume to the music distortion when stopped! Turn back 1/4, now is the best state of this set of audio, as for the tone can be adjusted through the host, I do not recommend adjusting the tone of the amplifier adjustment, open high or low channel will only have added engine and electrical appliances and other noise crosstalk opportunities.