Lights dim when bass hits....

You need to upgrade your electrical system.

First easy thing you can do is buy a bigger battery. Get a battery with the highest cold cranking amps(cca) that will fit. Yellow top would be great.

If you have the $$ have a higher amp alternator put in. these are very expensive.

this is an advanced solution, and any vehicle with a big amp should have this done. Its called a big 3 upgrade.

Get some at least 2 awg hook up wire. you will need enough to run a wire to the neg of the battery to the chassis to your altinator. and enough to run from the pos on the bat to the pos on the altinator. and from the neg to the frame of the car.

Use copper lugs and solder them on the ends of the wires. Use a blow torch and pliers to hold it and heat it up. Melt solder into it about half way full, and then push stripped end into it, then squelch it with a damp cloth and wipe it off.

Do this for all, and hook everything up.

You can install a CAP if you want. I personally don't believe in them. They help the car dimming a little, but the lower the voltage at the amp.

Simple fix

You need to buy a capasitor or power cap. (Any decent car audio shop will have them)

A capasitor charges up, stores energy and handles deep base without light flicker, simple to fit.

You are currently, slowly killing your battery with power surges so get one as soon as you can


Happy vibes

Lloyd