Set the system correctly

Moin together. I could use n bissel help setting my small system in the car. I’m not really fit. I’ve already screwed it myself, but this has worsened the sound image rather… If you can solve this over this forum somehow, it would be really great! Here’s my hardware: Radio: Sony CDX-L400X CD tuner (4 x 45w) Amplifier: Blaupunkt GTA 250 (2/1-channel power amplifier Max. Power 2 x 100 W / 1 x 400 W RMS Power 2 x 50 W / 1 x 160 W Bridging Mode: 2/ 1 channels Variable high and low pass filter Bass Boost 0/9/18 dB switchable) Subwoofer: Bass tube RedStar Bt-1 (300 watts music, 120 watts RMS frequency range: 30 – 2500 HZ efficiency 90 dB 8″ 30 OZ) rear shelf (not connected to the amplifier): Pyle NW694 (4-way Coax speaker (6 x 9″ power 200/400 watts, impedance 4 Ohm neodymium dome tweeter, 35 Hz – 22 kHz) front (also not connected to the amplifier): Standartboxes from my Fiat Punto “Cult” So, I hope someone can do something with it ngen and tell me so roughly what to adjust on the amplifier so and what to do on the radio itself in settings… Thanks already in advance, Gruss Korken^2k.