High and Low function problem

[25Jeep25]

I have a sub and amp combo in my car and I installed it about 6 months ago. My amp has a high and a low function along with all of the basic adjustments. One day the high function stopped working but the odd part was the low function still worked fine so I figured it was the amp so I called kicker and they sent me a replacement. Well after installing the new amp I come to find out that the same problem is still occurring. Anyone know any tips or what’s wrong?

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