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It is possible that your speakers are wrongly chosen, or perhaps wrongly wired up to the Alpine unit.
What speakers do you have, how many, and are they hooked up in parallel, or in series, or how are they hooked up?
It is of course faintly possible that you simply have a defective Alpine unit. I hope it was sold to your New, rather than Used, since Used units have no warranty or (usually) return protection.
Which speakers are hooked to what output?
Then I think the problem is with wrong impedance matching.
Do you know the rating of your car's speakers in Ohms, the impedance per speaker?
That has to be matched to the impedance of the speaker outputs of the Alpine device... e.g. you should have an 8 Ohm speaker, hooked up to an 8 Ohm output, and only one of them on that output.
Or is your have a 8 Ohm speaker and another 8 Ohm speaker, and a 4 Ohm output, then you have to hook both those speakers, in parallel, to the 4 Ohm output, since two 8 Ohms loads in parallel will equal 4 Ohms in effective impedance rating.
Then each speaker, alone, is 4 Ohms, according to that.
So, what are the outputs of your Alpine unit rated at? in Ohms?
Then you need to have one speaker to one Alpine output, then. That's it.
Depends upon the wiring. Did you buy the speakers, but have someone else install them?
If you installed them, you should know which wires go to which speaker. Or be able to trace the wires.
If you had a good voltmeter, you could put a meter across the wires, and find the ones that read 4 Ohms - those go to one speaker of the set.
As it is... one speaker to one Alpine output, it's as simple as that.