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The front speakers are not functioning, although the back speakers are working well. I have been unable to discover a solution to this issue. I believe I have the alpine upgrade, since all the speakers in the front are manufactured by alpine, and there is also alpine trim and tweeters present. All of them ceased functioning simultaneously. I have attempted to adjust the balance and fading settings, but to no avail. I have examined the alpine kits and noticed that they include an amplifier. However, I have been unable to locate the exact position of the amplifier after thoroughly inspecting beneath the seats and behind the trims in the boot. Do you have any suggestions or thoughts?

The speakers are powered by the amplifier, which is positioned below the left rear trim panel inside the automobile.

There is an absence of an amplifier at that location.

It is unclear - if you own the amplifier, that is the designated location for it
(based on my wiring diagrams, at least)

Which audio system is installed in your vehicle?

I was examining the wiring diagrams for the standard version.

May I request to see the diagram?

this is one
file:///C:/Users//Downloads/Amplifier-2.pdf

I will reexamine the situation, but I did not see anything when I removed all of it before. Thank you for your assistance.