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How to Power a Car Amplifier Using a Computer Power Supply


If you've got a car amplifier you'd like to use in your home, there's one major obstacle to overcome: how to power the amplifier. Wall outlets provide volt AC power, but amplifiers require volt DC power. You'll have to do a little extra wiring, but the problem is not insurmountable. Look up the input power specifications for your amplifier, using the manual or the manufacturer's website. Find the specification for current draw in amperes. Purchase an AC to DC power inverter.

I've been running car amplifiers in my room for 6 years or so, it used to be hard to get proper amplifier and if u were like me you probably had spare ATX power suplies so you could save a few bucks on that. These days it's much cheaper and easier to just get 24V chip amp from ebay and have decent setup.

Even designing and building your own, internet is full of schematics that are just waiting to be built. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson. If you already have amplifier you can just skip this step.

If you still haven't got one and you are thinking about buying it there are few things to consider. Most people are using class AB on mids and highs midrange speakers and tweeters while going for class D on subwoofers. Reasons for this are that class AB has better sound characteristics. There is a lot of discussion about this so i'm not gonna go there, but main difference between them is power consumption.

Then connect the amp to the power supply to simulate the car to use a sound system which has an out put specifically for the sub woofer.

This is thing to consider when choosing PSU and desired output power. On last 2 pictures you can see difference between GZTA 4. Both amps were set to 20V output about W to 4ohm dummy loadclass AB is drawing This means that by using same power supply next step you can get more power with class D amp. Since you have your amplifier, you need 12V power supply to power it up. Only downside is they provide only 12V and not 14,4V.

This means you are gonna get a bit less power than your amplifier is rated at some are rated at 12V and at 14,4V, some only at Other alternative is to get 12V power supply for LEDs or other things. These have small potentiometer so you can adjust voltage a bit higher, usually from V.

PC ATX usually requires green wire to be connected to negative terminal to power on. You can use simple switch to short them together. You will also need to cut off connectors and bundle together all 12V wires and Ground. Modifying ATX power supply for 14V output can be done if you have some electronic knowledge, but if you dont then you shouldn't be opening one. They contain capacitors that are charged up to mains voltage and can be deadly.

A subwoofer meant for a car stereo can often give you better sound quality on your home theater system. The problem is that this subwoofer requires an amplifier. Hello everybody, recently i bought car amplifier for repair and decided that im gonna replace my Sony XM that i have been running as my subwoofer. The main reason for connecting an amplifier to the stereo would be. audio cable to the left and right output jacks labeled for the tape deck on the home stereo.

For this reason i'm not gonna go further, if you are good with it you wont have any problems with it since its as easy as changing few resistors. Add together power of all channels, for example if your amplifier is 2xW you get W, if you have monoblock 1xW or just bridge 2 channels use power that its rated at.

Good rule of thumb is to multiply that by 1. Add about 50W of headroom to that. Check if your rating is a bit higher than your fuses on your amplifier. If you go under it, it may not be enough to blow fuses which could lead to damage of your wires, power supply or even burn them down. Now you see why its better to get class D for higher amounts of power, that's W difference for W amplifier. Use max current rating of your power supply to choose your wire gauge.

Hook up amp and subs in house

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. With higher power amplifiers its good to also include fuse that is recommended with your power wire.

Tips on how to connect, place, and adjust your home theater subwoofer for better Many stereo receivers and amps also have subwoofer outputs for these. If you've got a car amplifier you'd like to use in your home, there's one major obstacle to overcome: how to power the amplifier. Wall outlets provide volt AC. Use it inside or outside your house by having vehicles and have no room for that big subwoofer in your new car, don't give it or throw it away. Connect both striped ends using electrical tape or soldering iron or both.

Use online charts to roughly calculate your wire gauge, but its always better to get bigger gauge as they will have less drop in voltage with higher current draws. I included diagrams for connecting psu to amplifier but if you have any questions just ask me in comments since your setup might be a bit different.

This way your PSU would turn on at the same time as your amplifier. For audio input you need RCAs. Simple 3. You can get them in any bigger shop or even online.

If you have high power amplifier and simple PSU wont get you enough power you could consider getting 12V batteries. Don't get open types since they can produce a lot of hydrogen while charging which is not good considering you are going to have them in your room.

SLA or Gel types are good for this since they are mostly closed and have better discharge capabilities deep discharge. Please enable JavaScript to watch this video. Get the Gadget Hacks Daily Life hacks for your smartphone. Sign Up. Share Your Thoughts Click to share your thoughts. Hot Latest. One is maximum short bursts watts and second is the nominal RMS Watts. The first is basicly a short powerfull burst of watts to a speaker, and the second RMS is the maximum continously power.

I have a watt Sony Xplod car amp and a 12v 34ah power supply. Any problems?

There shouldn't be any problems as long as you are pushing speakers or sub that is in that range. You couldn't push an earthquake hole 15" with it, but you could push a pair of 10's or 12's. Not Helpful 4 Helpful 0.

An amp have watt ratings per channel. Look for RMS watt on your amps specifications per channel.

How to Properly Hook Up a Car Amplifier Inside the House

Add that to the number of channels used. That is the "optimal" power supply you need. What does "group all the ground wires together except the ground wire " mean? The rest is combined. Also, if you have 10 yellow wires combined, have 10 black wires combined as well. Unanswered Questions.

Both of them have power, but the only sound I'm hearing is feedback and heavy distortion. What should I do? Answer this question Flag as Flag as What do I do if my power supply doesn't want to turn on my amp?

Include your email address to get a message when this question is answered. Already answered Not a question Bad question Other. Tips You may add a switch in step 4.

Sony car sub-woofer with a home theater receiver! No 12-volt amp or car stereo required

Just connect both ends of the wire into the switch.

2 comments Add your comment below

  1. It is very a pity to me, that I can help nothing to you. I hope, to you here will help. Do not despair.

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