Sub and speakers losing power while driving

[LM46_]

Hello, was wondering if anyone could help me; while the car is sitting still the sub is punchy and almost overpowered, when the car is moving the sub and speakers (which are both connected to the same amp) loses power, it still works but the bass isn’t there and the speakers quiet down, does anyone have any idea what it could be? Everything worked perfectly but now it’s having issues, thanks

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[Gunk]

some more info about your setup would be helpful. vehicle, amps, sub, speakers, stock electrical?

 

[LM46_]

VW Lupo 1.4 TDI, 600W 4 channel amp, pioneer, Pioneer ZR 10” Sub, not sure on the speakers whatever came with the car but they are connected to the Amp