Use the same amperage as the amp's fuses. Most home stereo speakers are rated for 8 ohms of impedance, or electrical resistance. Most car amplifiers are rated for 4-ohm speakers. You can use 8-ohm speakers without any problem, though they won't put out as much volume. Boxed car speakers are your best choice.
Hooking up my car amplifier in my house (for my MAME arcade) - Ars Technica OpenForum
If your amplifier is rated for 2-ohm speakers, use those to get better volume at any power setting. Your speakers' sensitivity, expressed in decibels, is another factor. Every 3 dB of sensitivity doubles your speakers' volume, so speakers rated at 90 dB will generate twice the volume of a set rated at 87 dB. Connect an MP3 player or other audio source to the amplifier.
Turn on the power supply, adjust the amp to a low volume setting, and power it up. If you hear a loud hum, that means you're plugged into an outlet with a bad ground. Turn off the power, and try again from a different outlet.
If the hum is gone, turn up the volume slowly until you reach a normal listening level. Check the amplifier and power supply frequently, to make sure they aren't overheating. If the amplifier overheats, you need higher-impedance speakers.
Hooking up my car amplifier in my house (for my MAME arcade)
If the power supply overheats, the amp is drawing too much current. Fred Decker is a trained chef and certified food-safety trainer. He's held positions selling computers, insurance and mutual funds, and was educated at Memorial University of Newfoundland and the Northern Alberta Institute of Technology.
You could go out and buy a new subwoofer to install in your car, but that requires that you spend a couple of hundred dollars on a quality unit. However, if you have an extra home subwoofer , you can convert it so that it can be used in your car. There are some modifications that will need to be made as there are some very basic differences between the designs of car and home subwoofers.
Still, this step by step guide will show you what you need to do. In most cases, your home-use subwoofer is an active subwoofer. This means that it probably has a built-in amplifier used to power the speaker. However, it is usually a volt amplifier, and your car battery produces only 12 volts.
How to Hook Up a Car Amp Inside the House to a Wall Outlet
You could purchase an inverted one, but those are a temporary solution at best. The good thing is that the amplifier used in most active subwoofers is not very good; therefore, a cheap car amplifier is more than adequate to replace it. Unless you want the bass to overpower the rest of the music in your car, choose a cheap amp that is rated about half in terms of wattage output of your main car amplifier. Remove the screws that hold the plug adapter assembly in place and remove the assembly. Snip off the wires that go to the speaker itself and discard the other electronics.
Get rid of the power cord.
This is only used for the amplifier so you won't be needing it anymore. If the assembly can't be removed, you will need to cut an opening in the box.
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- How to Convert a Home Subwoofer into a Car Audio Subwoofer.