HELP!! Single Channel LPF Cut Amplifiers

[Massn]

I have replaced my stock rear door speakers on my 2008 Honda Insight with Kenwood KFC-PS170C Components speakers and fitted a manual single lpf cut amplifier. The issue is that I have to keep adjusting the frequency and gain on my manual amplifier on almost every song. Is there a digital version that works like the one on my JBL SB250 subwoofer for my house? I have a family so am avoiding fitting a big amp, equaliser, big subwoofer or under seat subwoofer.

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