When I listened to music, the subwoofer has тщшыув also music has stopped

That all depends on how much money you want to spend!

My best advice would be to go to a proper hi-fi shop that has the time and the expertise to advice you. If you are in England I would recommend you go to somewhere like Richer Sounds, link below.
Places like this will even let you test the amp with your speakers.
http://www.froogle.richersounds.com/

Generally, subwoofers require separate circuitry. Your car radio has that circuitry. Bluetooth is set up for stereo only and your phone will only supply stereo output

your getting fead back. check the ground on the amp it needs to be bare metal and tight also check the rcas they need to be tight and if its only hapening wile u play the ipod try switching wires from the i pod it hapens all the time with aux cables they break easy.

it depends on if you are using a suspension subwoofer or a ported subwoofer setup.

You need to install a heavier gauge wire to your amp and a capacitor. It works fine at low volumes because there is enough wattage from the battery to power the bass output of the amp but at higher volumes the amp does not have enough power.

Heavier gauge wire supplies more poer, and a capacitor stores a reserve of wattage for the amp to use so that it does not run out while blasting your tunes.

Depending on what kind of music you listen to I would say around a 1200 Watt Amp would suffice for what you are saying. Thank you for using Fix Ya! Don't forget to rate the overall answer to your question.

does the music stop? or do the sub(s) kick out. your amp might be to big for the sub rating , try turning down the gain

your amp mine be going in to protection mode