If you have high power amplifier and simple PSU wont get you enough power you could consider getting 12V batteries. Send a private message to scoob SLA or Gel types are good for this since they are mostly closed and have better discharge capabilities deep discharge. Hook your audio source to amplifier, play test tone and turn the volume up. In step 4, are you saying you are able to connect the PSU 12v wire directly to the car battery? I could'nt find anything cheap that was around 40A so if i want to upgrade amp 60A should do and its pretty cheap so. So you will have to setup a v battery charger for the night and early morning hours to keep battery topped off.
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How to Properly Hook Up a Car Amplifier Inside the House
Find the specification for current draw in amperes. Copenhagen, Denmark. Make sure to use a sealed battery too, most car and deep cycle batteries are vented and can give off flammable gas hydrogen? My name is Alen and i study electronic engineering. Wall outlets provide volt AC power, but amplifiers require volt DC power. Its always better to get as big wire as you can connect to your power input that is as short as possible and then use longer wires to your speaker.