##### Asked by: Chunsheng Reiche
automotive auto infotainment technologies

# Can a computer power supply run a car amp?

15
Yes, you can use normal home entertainment system stereo speakers with your "new" computer power-supplied indoor car audio amplifier! First, make sure you have 12v at the dc+ input of the amp and 12v to the remote input to the amp. The amp will not turn on if the remote wire is not hooked up and powered.

Also asked, how many amps does it take to run a car stereo?

A typical stereo head unit will need about 5 amps of power. If you want to crank up the volume for parties and plan on using a powerful amplifier, then 5 amps likely won't be enough either. We do have power supplies available that offer up to 30 amps.

how many amps does a 1000 watt amp draw? Watt = Volts * Amps so if the amp is putting out 1000W RMS and uses a 12V supply then it requires 83 Amps. There are two other factors to consider. The amp is not 100% efficient so assume 50% efficiency and you have 166 amps. Then because the 1000W is peak, derate to 1/3 of that giving you about 55 Amps.

Just so, how many amps does a car amplifier draw?

You need to start with your given power (power is measured in watts) so your amp puts out 300w with what, 13.8v of potential voltage? So your amplifier, with your charging system sitting at 13.8 volts, puts out 300w, and your current draw of your amplifier is 21.74 amperes (amps).

How many volts does a speaker use?

Since the amplifier is at the same location as the speaker, the speaker requires only a line level audio signal as an input. Line level signals are typically around 1-2 volts, and can be transmitted over much smaller cable (typically 20-26 AWG).

Related Question Answers

Pundit

## Is amplifier output AC or DC?

Electronic signal amplifiers come in two basic types: those that can amplify a steady voltage (DC) and those that block DC but amplify audio and higher frequencies. AC amplifiers reject noise more easily, while DC amplifiers have better low-frequency response. Most amplifiers use AC coupling.

Pundit

## Can I run a car stereo off a battery charger?

Yes, you can power a car stereo with a battery charger. A car battery supplies 12-volt power to the car stereo to power it up. So a 12-volt battery would be sufficient.

Pundit

## How much current does a car stereo draw when off?

Most vehicles draw some battery current when the key is off, thanks to the clock and the internal memory of engine computers, body-control modules, and radio presets. Altogether, they draw a very small amount of current. Fifty milliamps would be a safe upper limit for this, though many vehicles will draw less.

Pundit

## How many amps does a car stereo draw when off?

The acceptable current draw should be around 0.03Amps. If that can't be achieved upto 0.075-0.1 can be acceptable if the vehicle is driven most days.

Pundit

## How do you calculate the current draw of an amp?

Ohm's law states that the voltage equals the amperage times the resistance, so if you divide the voltage of your power source by the resistance of the load, you will find the amps. For example, if you plug a 40-Ohm dryer into a 220-volt outlet, the appliance will draw 5.5 amps.

Teacher

## How many volts is a car radio?

Now Transistorized radios can work on 1.2 to 3, 6, or 9 volts. And of course for cars, many take 12 VDC.

Teacher

## How can I test my car stereo at home?

You can quickly bench-test a car stereo with a few test leads, a spare speaker and a power source.
1. Cut four, 2-foot jumper wires from the roll of electrical wire.
2. Set the stereo down, with the display facing you.
3. Attach the end of one jumper wire to the positive wire of the test speaker with an alligator clip.

Teacher

## How do I hook up a car stereo in my house without a power supply?

Connect Using 12DC Converter
Although using a power supply to hook up a car stereo in the house is one way, you can do it even it if you don't have a PSU. You connect the speakers to your car stereo using the gray and green wires. You may need to use extra speaker wire.

Teacher

## How many amps does a TV use?

LCD televisions vary widely, using 0.16 to 0.41 watts per square inch, so a 46-inch LCD television could use as little as 1.208 amps or as much as 3.1 amps.

Reviewer

## Can I hook up my car stereo directly to battery?

When you wire your car stereo directly to the car battery, its recommended that you use a fuse to protect the radio. The rest of the wires will be for connecting your car speakers or RCA plugs to external amplifiers. 3) Now you will need two metal terminals that go over the battery posts.

Reviewer

## Will 1000 watt amp drain battery?

To answer the original quesiton, a 1000 watt amp will not drain your battery, but a capacitor is highly recommended.

Reviewer

12.5 Amps

Supporter

## What gauge wire should I use for a 1000 watt amp?

If your amp is capable of 1000 watts RMS then it requires 4 gauge wire.

Supporter

## How many amps does a 300 watt amp draw?

Equivalent Watts and Amps at 120V AC
Power Current Voltage
150 Watts 1.25 Amps 120 Volts
200 Watts 1.667 Amps 120 Volts
250 Watts 2.083 Amps 120 Volts
300 Watts 2.5 Amps 120 Volts

Supporter

## How many volts does a car amp need?

For starters, your car amplifier is meant to receive its voltage from a 12 volt DC source which is your car battery. Common households use approximately 120 volts AC. So you can see that we two problems.

Beginner

## How long should my ground wire be for my car amp?

For starters, the distance between the amplifier and the grounding point should be no more than 18 inches, the shorter the length of wire the better. The gauge of the ground wire must match the gauge of the power wire to assure proper current flow.

Beginner

## How many watts is good for a car stereo?

If you're using your car's factory stereo — 50 to 200 watts RMS of power for the bass will do nicely. An aftermarket receiver — you might want 200 to 300 watts RMS of power for your sub. Amplified speakers with around 50 watts RMS per channel — plan on 250 to 500 watts RMS for bass.

Beginner

## What hits harder 2ohm or 4ohm?

A subwoofer with a lower electrical resistance produces a louder sound than one with a high electrical resistance, which means that 2ohm subwoofers are louder than 4ohm ones. Although louder, 2 ohm subwoofers are also more likely to produce a poorer quality of sound due to its' power consumption.

Beginner

## Can you install a subwoofer without an amp?

Subwoofers are designed to increase the bass frequencies, resulting in a deep, thumping sound. In most cases, they are paired with an amplifier to boost the sound. If you do not have the funds for both components, you can still hook up a subwoofer without an amplifier; it simply involves a little more know-how.

Co-Authored By:

#### EveryThingWhat Staff Editor

6

9th February, 2020

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